src/cmd/compile/internal/ssa/gen/S390X.rules

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Lowering arithmetic
(Add(64|Ptr)  x y) -> (ADD  x y)
(Add(32|16|8)  x y) -> (ADDW  x y)
(Add32F x y) -> (FADDS x y)
(Add64F x y) -> (FADD x y)

(Sub(64|Ptr)  x y) -> (SUB  x y)
(Sub(32|16|8)  x y) -> (SUBW  x y)
(Sub32F x y) -> (FSUBS x y)
(Sub64F x y) -> (FSUB x y)

(Mul64  x y) -> (MULLD  x y)
(Mul(32|16|8)  x y) -> (MULLW  x y)
(Mul32F x y) -> (FMULS x y)
(Mul64F x y) -> (FMUL x y)

(Div32F x y) -> (FDIVS x y)
(Div64F x y) -> (FDIV x y)

(Div64  x y) -> (DIVD  x y)
(Div64u x y) -> (DIVDU x y)
// DIVW/DIVWU has a 64-bit dividend and a 32-bit divisor,
// so a sign/zero extension of the dividend is required.
(Div32  x y) -> (DIVW  (MOVWreg x) y)
(Div32u x y) -> (DIVWU (MOVWZreg x) y)
(Div16  x y) -> (DIVW  (MOVHreg x) (MOVHreg y))
(Div16u x y) -> (DIVWU (MOVHZreg x) (MOVHZreg y))
(Div8   x y) -> (DIVW  (MOVBreg x) (MOVBreg y))
(Div8u  x y) -> (DIVWU (MOVBZreg x) (MOVBZreg y))

(Hmul(64|64u)  x y) -> (MULH(D|DU)  x y)
(Hmul32  x y) -> (SRDconst [32] (MULLD (MOVWreg x) (MOVWreg y)))
(Hmul32u x y) -> (SRDconst [32] (MULLD (MOVWZreg x) (MOVWZreg y)))

(Mod(64|64u)  x y) -> (MOD(D|DU)  x y)
// MODW/MODWU has a 64-bit dividend and a 32-bit divisor,
// so a sign/zero extension of the dividend is required.
(Mod32  x y) -> (MODW  (MOVWreg x) y)
(Mod32u x y) -> (MODWU (MOVWZreg x) y)
(Mod16  x y) -> (MODW  (MOVHreg x) (MOVHreg y))
(Mod16u x y) -> (MODWU (MOVHZreg x) (MOVHZreg y))
(Mod8   x y) -> (MODW  (MOVBreg x) (MOVBreg y))
(Mod8u  x y) -> (MODWU (MOVBZreg x) (MOVBZreg y))

// (x + y) / 2 with x>=y -> (x - y) / 2 + y
(Avg64u <t> x y) -> (ADD (SRDconst <t> (SUB <t> x y) [1]) y)

(And64 x y) -> (AND x y)
(And(32|16|8) x y) -> (ANDW x y)

(Or64 x y) -> (OR x y)
(Or(32|16|8) x y) -> (ORW x y)

(Xor64 x y) -> (XOR x y)
(Xor(32|16|8) x y) -> (XORW x y)

(Neg64 x) -> (NEG x)
(Neg(32|16|8) x) -> (NEGW x)
(Neg32F x) -> (FNEGS x)
(Neg64F x) -> (FNEG x)

(Com64 x) -> (NOT x)
(Com(32|16|8) x) -> (NOTW x)
(NOT x) && true -> (XOR (MOVDconst [-1]) x)
(NOTW x) && true -> (XORWconst [-1] x)

// Lowering boolean ops
(AndB x y) -> (ANDW x y)
(OrB x y) -> (ORW x y)
(Not x) -> (XORWconst [1] x)

// Lowering pointer arithmetic
(OffPtr [off] ptr:(SP)) -> (MOVDaddr [off] ptr)
(OffPtr [off] ptr) && is32Bit(off) -> (ADDconst [off] ptr)
(OffPtr [off] ptr) -> (ADD (MOVDconst [off]) ptr)

// TODO: optimize these cases?
(Ctz64NonZero x) -> (Ctz64 x)
(Ctz32NonZero x) -> (Ctz32 x)

// Ctz(x) = 64 - findLeftmostOne((x-1)&^x)
(Ctz64 <t> x) -> (SUB (MOVDconst [64]) (FLOGR (AND <t> (SUBconst <t> [1] x) (NOT <t> x))))
(Ctz32 <t> x) -> (SUB (MOVDconst [64]) (FLOGR (MOVWZreg (ANDW <t> (SUBWconst <t> [1] x) (NOTW <t> x)))))

(BitLen64 x) -> (SUB (MOVDconst [64]) (FLOGR x))

// POPCNT treats the input register as a vector of 8 bytes, producing
// a population count for each individual byte. For inputs larger than
// a single byte we therefore need to sum the individual bytes produced
// by the POPCNT instruction. For example, the following instruction
// sequence could be used to calculate the population count of a 4-byte
// value:
//
//     MOVD   $0x12345678, R1 // R1=0x12345678 <-- input
//     POPCNT R1, R2          // R2=0x02030404
//     SRW    $16, R2, R3     // R3=0x00000203
//     ADDW   R2, R3, R4      // R4=0x02030607
//     SRW    $8, R4, R5      // R5=0x00020306
//     ADDW   R4, R5, R6      // R6=0x0205090d
//     MOVBZ  R6, R7          // R7=0x0000000d <-- result is 13
//
(PopCount8  x) -> (POPCNT (MOVBZreg x))
(PopCount16 x) -> (MOVBZreg (SumBytes2 (POPCNT <typ.UInt16> x)))
(PopCount32 x) -> (MOVBZreg (SumBytes4 (POPCNT <typ.UInt32> x)))
(PopCount64 x) -> (MOVBZreg (SumBytes8 (POPCNT <typ.UInt64> x)))

// SumBytes{2,4,8} pseudo operations sum the values of the rightmost
// 2, 4 or 8 bytes respectively. The result is a single byte however
// other bytes might contain junk so a zero extension is required if
// the desired output type is larger than 1 byte.
(SumBytes2 x) -> (ADDW (SRWconst <typ.UInt8> x [8]) x)
(SumBytes4 x) -> (SumBytes2 (ADDW <typ.UInt16> (SRWconst <typ.UInt16> x [16]) x))
(SumBytes8 x) -> (SumBytes4 (ADDW <typ.UInt32> (SRDconst <typ.UInt32> x [32]) x))

(Bswap64 x) -> (MOVDBR x)
(Bswap32 x) -> (MOVWBR x)

// add with carry
(Select0 (Add64carry x y c))
  -> (Select0 <typ.UInt64> (ADDE x y (Select1 <types.TypeFlags> (ADDCconst c [-1]))))
(Select1 (Add64carry x y c))
  -> (Select0 <typ.UInt64> (ADDE (MOVDconst [0]) (MOVDconst [0]) (Select1 <types.TypeFlags> (ADDE x y (Select1 <types.TypeFlags> (ADDCconst c [-1]))))))

// subtract with borrow
(Select0 (Sub64borrow x y c))
  -> (Select0 <typ.UInt64> (SUBE x y (Select1 <types.TypeFlags> (SUBC (MOVDconst [0]) c))))
(Select1 (Sub64borrow x y c))
  -> (NEG (Select0 <typ.UInt64> (SUBE (MOVDconst [0]) (MOVDconst [0]) (Select1 <types.TypeFlags> (SUBE x y (Select1 <types.TypeFlags> (SUBC (MOVDconst [0]) c)))))))

// math package intrinsics
(Sqrt        x) -> (FSQRT x)
(Floor       x) -> (FIDBR [7] x)
(Ceil        x) -> (FIDBR [6] x)
(Trunc       x) -> (FIDBR [5] x)
(RoundToEven x) -> (FIDBR [4] x)
(Round       x) -> (FIDBR [1] x)

// Atomic loads and stores.
// The SYNC instruction (fast-BCR-serialization) prevents store-load
// reordering. Other sequences of memory operations (load-load,
// store-store and load-store) are already guaranteed not to be reordered.
(AtomicLoad(8|32|Acq32|64|Ptr) ptr mem) -> (MOV(BZ|WZ|WZ|D|D)atomicload ptr mem)
(AtomicStore(32|64|PtrNoWB) ptr val mem) -> (SYNC (MOV(W|D|D)atomicstore ptr val mem))

// Store-release doesn't require store-load ordering.
(AtomicStoreRel32 ptr val mem) -> (MOVWatomicstore ptr val mem)

// Atomic adds.
(AtomicAdd32 ptr val mem) -> (AddTupleFirst32 val (LAA ptr val mem))
(AtomicAdd64 ptr val mem) -> (AddTupleFirst64 val (LAAG ptr val mem))
(Select0 <t> (AddTupleFirst32 val tuple)) -> (ADDW val (Select0 <t> tuple))
(Select1     (AddTupleFirst32   _ tuple)) -> (Select1 tuple)
(Select0 <t> (AddTupleFirst64 val tuple)) -> (ADD val (Select0 <t> tuple))
(Select1     (AddTupleFirst64   _ tuple)) -> (Select1 tuple)

// Atomic exchanges.
(AtomicExchange32 ptr val mem) -> (LoweredAtomicExchange32 ptr val mem)
(AtomicExchange64 ptr val mem) -> (LoweredAtomicExchange64 ptr val mem)

// Atomic compare and swap.
(AtomicCompareAndSwap32 ptr old new_ mem) -> (LoweredAtomicCas32 ptr old new_ mem)
(AtomicCompareAndSwap64 ptr old new_ mem) -> (LoweredAtomicCas64 ptr old new_ mem)

// Lowering extension
// Note: we always extend to 64 bits even though some ops don't need that many result bits.
(SignExt8to(16|32|64)  x) -> (MOVBreg x)
(SignExt16to(32|64) x) -> (MOVHreg x)
(SignExt32to64 x) -> (MOVWreg x)

(ZeroExt8to(16|32|64)  x) -> (MOVBZreg x)
(ZeroExt16to(32|64) x) -> (MOVHZreg x)
(ZeroExt32to64 x) -> (MOVWZreg x)

(Slicemask <t> x) -> (SRADconst (NEG <t> x) [63])

// Lowering truncation
// Because we ignore high parts of registers, truncates are just copies.
(Trunc(16|32|64)to8  x) -> x
(Trunc(32|64)to16 x) -> x
(Trunc64to32 x) -> x

// Lowering float <-> int
(Cvt32to32F x) -> (CEFBRA x)
(Cvt32to64F x) -> (CDFBRA x)
(Cvt64to32F x) -> (CEGBRA x)
(Cvt64to64F x) -> (CDGBRA x)

(Cvt32Fto32 x) -> (CFEBRA x)
(Cvt32Fto64 x) -> (CGEBRA x)
(Cvt64Fto32 x) -> (CFDBRA x)
(Cvt64Fto64 x) -> (CGDBRA x)

(Cvt32Fto64F x) -> (LDEBR x)
(Cvt64Fto32F x) -> (LEDBR x)

(Round(32|64)F x) -> (LoweredRound(32|64)F x)

// Lowering shifts

// Lower bounded shifts first. No need to check shift value.
(Lsh64x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SLD x y)
(Lsh32x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SLW x y)
(Lsh16x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SLW x y)
(Lsh8x(64|32|16|8)   x y) && shiftIsBounded(v) -> (SLW x y)
(Rsh64Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRD x y)
(Rsh32Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRW x y)
(Rsh16Ux(64|32|16|8) x y) && shiftIsBounded(v) -> (SRW (MOVHZreg x) y)
(Rsh8Ux(64|32|16|8)  x y) && shiftIsBounded(v) -> (SRW (MOVBZreg x) y)
(Rsh64x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SRAD x y)
(Rsh32x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SRAW x y)
(Rsh16x(64|32|16|8)  x y) && shiftIsBounded(v) -> (SRAW (MOVHreg x) y)
(Rsh8x(64|32|16|8)   x y) && shiftIsBounded(v) -> (SRAW (MOVBreg x) y)

// Unsigned shifts need to return 0 if shift amount is >= width of shifted value.
//   result = shift >= 64 ? 0 : arg << shift
(Lsh(64|32|16|8)x64 <t> x y) -> (MOVDGE <t> (SL(D|W|W|W) <t> x y) (MOVDconst [0]) (CMPUconst y [64]))
(Lsh(64|32|16|8)x32 <t> x y) -> (MOVDGE <t> (SL(D|W|W|W) <t> x y) (MOVDconst [0]) (CMPWUconst y [64]))
(Lsh(64|32|16|8)x16 <t> x y) -> (MOVDGE <t> (SL(D|W|W|W) <t> x y) (MOVDconst [0]) (CMPWUconst (MOVHZreg y) [64]))
(Lsh(64|32|16|8)x8  <t> x y) -> (MOVDGE <t> (SL(D|W|W|W) <t> x y) (MOVDconst [0]) (CMPWUconst (MOVBZreg y) [64]))

(Rsh(64|32)Ux64 <t> x y) -> (MOVDGE <t> (SR(D|W) <t> x y) (MOVDconst [0]) (CMPUconst y [64]))
(Rsh(64|32)Ux32 <t> x y) -> (MOVDGE <t> (SR(D|W) <t> x y) (MOVDconst [0]) (CMPWUconst y [64]))
(Rsh(64|32)Ux16 <t> x y) -> (MOVDGE <t> (SR(D|W) <t> x y) (MOVDconst [0]) (CMPWUconst (MOVHZreg y) [64]))
(Rsh(64|32)Ux8  <t> x y) -> (MOVDGE <t> (SR(D|W) <t> x y) (MOVDconst [0]) (CMPWUconst (MOVBZreg y) [64]))

(Rsh(16|8)Ux64 <t> x y) -> (MOVDGE <t> (SRW <t> (MOV(H|B)Zreg x) y) (MOVDconst [0]) (CMPUconst y [64]))
(Rsh(16|8)Ux32 <t> x y) -> (MOVDGE <t> (SRW <t> (MOV(H|B)Zreg x) y) (MOVDconst [0]) (CMPWUconst y [64]))
(Rsh(16|8)Ux16 <t> x y) -> (MOVDGE <t> (SRW <t> (MOV(H|B)Zreg x) y) (MOVDconst [0]) (CMPWUconst (MOVHZreg y) [64]))
(Rsh(16|8)Ux8  <t> x y) -> (MOVDGE <t> (SRW <t> (MOV(H|B)Zreg x) y) (MOVDconst [0]) (CMPWUconst (MOVBZreg y) [64]))

// Signed right shift needs to return 0/-1 if shift amount is >= width of shifted value.
// We implement this by setting the shift value to 63 (all ones) if the shift value is more than 63.
//   result = arg >> (shift >= 64 ? 63 : shift)
(Rsh(64|32)x64 x y) -> (SRA(D|W) x (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPUconst  y [64])))
(Rsh(64|32)x32 x y) -> (SRA(D|W) x (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst y [64])))
(Rsh(64|32)x16 x y) -> (SRA(D|W) x (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst (MOVHZreg y) [64])))
(Rsh(64|32)x8  x y) -> (SRA(D|W) x (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst (MOVBZreg y) [64])))

(Rsh(16|8)x64 x y) -> (SRAW (MOV(H|B)reg x) (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPUconst  y [64])))
(Rsh(16|8)x32 x y) -> (SRAW (MOV(H|B)reg x) (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst y [64])))
(Rsh(16|8)x16 x y) -> (SRAW (MOV(H|B)reg x) (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst (MOVHZreg y) [64])))
(Rsh(16|8)x8  x y) -> (SRAW (MOV(H|B)reg x) (MOVDGE <y.Type> y (MOVDconst <y.Type> [63]) (CMPWUconst (MOVBZreg y) [64])))

// Lowering rotates
(RotateLeft8 <t> x (MOVDconst [c])) -> (Or8 (Lsh8x64 <t> x (MOVDconst [c&7])) (Rsh8Ux64 <t> x (MOVDconst [-c&7])))
(RotateLeft16 <t> x (MOVDconst [c])) -> (Or16 (Lsh16x64 <t> x (MOVDconst [c&15])) (Rsh16Ux64 <t> x (MOVDconst [-c&15])))
(RotateLeft32 x y) -> (RLL  x y)
(RotateLeft64 x y) -> (RLLG x y)

// Lowering comparisons
(Less64      x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Less32      x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Less(16|8)  x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B)reg x) (MOV(H|B)reg y)))
(Less64U     x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Less32U     x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Less(16|8)U x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPWU (MOV(H|B)Zreg x) (MOV(H|B)Zreg y)))
// Use SETG with reversed operands to dodge NaN case.
(Less64F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP y x))
(Less32F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS y x))

(Leq64      x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Leq32      x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Leq(16|8)  x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B)reg x) (MOV(H|B)reg y)))
(Leq64U     x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Leq32U     x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Leq(16|8)U x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPWU (MOV(H|B)Zreg x) (MOV(H|B)Zreg y)))
// Use SETGE with reversed operands to dodge NaN case.
(Leq64F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP y x))
(Leq32F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS y x))

(Greater64      x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Greater32      x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Greater(16|8)  x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B)reg x) (MOV(H|B)reg y)))
(Greater64U     x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Greater32U     x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Greater(16|8)U x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPWU (MOV(H|B)Zreg x) (MOV(H|B)Zreg y)))
(Greater64F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Greater32F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Geq64      x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Geq32      x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Geq(16|8)  x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B)reg x) (MOV(H|B)reg y)))
(Geq64U     x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Geq32U     x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Geq(16|8)U x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPWU (MOV(H|B)Zreg x) (MOV(H|B)Zreg y)))
(Geq64F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Geq32F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Eq(64|Ptr) x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Eq32       x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Eq(16|8|B) x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B|B)reg x) (MOV(H|B|B)reg y)))
(Eq64F      x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Eq32F      x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Neq(64|Ptr) x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Neq32       x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Neq(16|8|B) x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMPW (MOV(H|B|B)reg x) (MOV(H|B|B)reg y)))
(Neq64F      x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Neq32F      x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

// Lowering loads
(Load <t> ptr mem) && (is64BitInt(t) || isPtr(t)) -> (MOVDload ptr mem)
(Load <t> ptr mem) && is32BitInt(t) && isSigned(t) -> (MOVWload ptr mem)
(Load <t> ptr mem) && is32BitInt(t) && !isSigned(t) -> (MOVWZload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) && isSigned(t) -> (MOVHload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) && !isSigned(t) -> (MOVHZload ptr mem)
(Load <t> ptr mem) && is8BitInt(t) && isSigned(t) -> (MOVBload ptr mem)
(Load <t> ptr mem) && (t.IsBoolean() || (is8BitInt(t) && !isSigned(t))) -> (MOVBZload ptr mem)
(Load <t> ptr mem) && is32BitFloat(t) -> (FMOVSload ptr mem)
(Load <t> ptr mem) && is64BitFloat(t) -> (FMOVDload ptr mem)

// Lowering stores
// These more-specific FP versions of Store pattern should come first.
(Store {t} ptr val mem) && t.(*types.Type).Size() == 8 && is64BitFloat(val.Type) -> (FMOVDstore ptr val mem)
(Store {t} ptr val mem) && t.(*types.Type).Size() == 4 && is32BitFloat(val.Type) -> (FMOVSstore ptr val mem)

(Store {t} ptr val mem) && t.(*types.Type).Size() == 8 -> (MOVDstore ptr val mem)
(Store {t} ptr val mem) && t.(*types.Type).Size() == 4 -> (MOVWstore ptr val mem)
(Store {t} ptr val mem) && t.(*types.Type).Size() == 2 -> (MOVHstore ptr val mem)
(Store {t} ptr val mem) && t.(*types.Type).Size() == 1 -> (MOVBstore ptr val mem)

// Lowering moves

// Load and store for small copies.
(Move [0] _ _ mem) -> mem
(Move [1] dst src mem) -> (MOVBstore dst (MOVBZload src mem) mem)
(Move [2] dst src mem) -> (MOVHstore dst (MOVHZload src mem) mem)
(Move [4] dst src mem) -> (MOVWstore dst (MOVWZload src mem) mem)
(Move [8] dst src mem) -> (MOVDstore dst (MOVDload src mem) mem)
(Move [16] dst src mem) ->
	(MOVDstore [8] dst (MOVDload [8] src mem)
		(MOVDstore dst (MOVDload src mem) mem))
(Move [24] dst src mem) ->
        (MOVDstore [16] dst (MOVDload [16] src mem)
	        (MOVDstore [8] dst (MOVDload [8] src mem)
                (MOVDstore dst (MOVDload src mem) mem)))
(Move [3] dst src mem) ->
	(MOVBstore [2] dst (MOVBZload [2] src mem)
		(MOVHstore dst (MOVHZload src mem) mem))
(Move [5] dst src mem) ->
	(MOVBstore [4] dst (MOVBZload [4] src mem)
		(MOVWstore dst (MOVWZload src mem) mem))
(Move [6] dst src mem) ->
	(MOVHstore [4] dst (MOVHZload [4] src mem)
		(MOVWstore dst (MOVWZload src mem) mem))
(Move [7] dst src mem) ->
	(MOVBstore [6] dst (MOVBZload [6] src mem)
		(MOVHstore [4] dst (MOVHZload [4] src mem)
			(MOVWstore dst (MOVWZload src mem) mem)))

// MVC for other moves. Use up to 4 instructions (sizes up to 1024 bytes).
(Move [s] dst src mem) && s > 0 && s <= 256 ->
	(MVC [makeValAndOff(s, 0)] dst src mem)
(Move [s] dst src mem) && s > 256 && s <= 512 ->
	(MVC [makeValAndOff(s-256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem))
(Move [s] dst src mem) && s > 512 && s <= 768 ->
	(MVC [makeValAndOff(s-512, 512)] dst src (MVC [makeValAndOff(256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem)))
(Move [s] dst src mem) && s > 768 && s <= 1024 ->
	(MVC [makeValAndOff(s-768, 768)] dst src (MVC [makeValAndOff(256, 512)] dst src (MVC [makeValAndOff(256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem))))

// Move more than 1024 bytes using a loop.
(Move [s] dst src mem) && s > 1024 ->
	(LoweredMove [s%256] dst src (ADD <src.Type> src (MOVDconst [(s/256)*256])) mem)

// Lowering Zero instructions
(Zero [0] _ mem) -> mem
(Zero [1] destptr mem) -> (MOVBstoreconst [0] destptr mem)
(Zero [2] destptr mem) -> (MOVHstoreconst [0] destptr mem)
(Zero [4] destptr mem) -> (MOVWstoreconst [0] destptr mem)
(Zero [8] destptr mem) -> (MOVDstoreconst [0] destptr mem)
(Zero [3] destptr mem) ->
	(MOVBstoreconst [makeValAndOff(0,2)] destptr
		(MOVHstoreconst [0] destptr mem))
(Zero [5] destptr mem) ->
	(MOVBstoreconst [makeValAndOff(0,4)] destptr
		(MOVWstoreconst [0] destptr mem))
(Zero [6] destptr mem) ->
	(MOVHstoreconst [makeValAndOff(0,4)] destptr
		(MOVWstoreconst [0] destptr mem))
(Zero [7] destptr mem) ->
	(MOVWstoreconst [makeValAndOff(0,3)] destptr
		(MOVWstoreconst [0] destptr mem))

(Zero [s] destptr mem) && s > 0 && s <= 1024 ->
	(CLEAR [makeValAndOff(s, 0)] destptr mem)

// Move more than 1024 bytes using a loop.
(Zero [s] destptr mem) && s > 1024 ->
	(LoweredZero [s%256] destptr (ADDconst <destptr.Type> destptr [(s/256)*256]) mem)

// Lowering constants
(Const(64|32|16|8)  [val]) -> (MOVDconst [val])
(Const(32|64)F [val]) -> (FMOV(S|D)const [val])
(ConstNil) -> (MOVDconst [0])
(ConstBool [b]) -> (MOVDconst [b])

// Lowering calls
(StaticCall [argwid] {target} mem) -> (CALLstatic [argwid] {target} mem)
(ClosureCall [argwid] entry closure mem) -> (CALLclosure [argwid] entry closure mem)
(InterCall [argwid] entry mem) -> (CALLinter [argwid] entry mem)

// Miscellaneous
(IsNonNil p) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMPconst p [0]))
(IsInBounds idx len) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU idx len))
(IsSliceInBounds idx len) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU idx len))
(NilCheck ptr mem) -> (LoweredNilCheck ptr mem)
(GetG mem) -> (LoweredGetG mem)
(GetClosurePtr) -> (LoweredGetClosurePtr)
(GetCallerSP) -> (LoweredGetCallerSP)
(GetCallerPC) -> (LoweredGetCallerPC)
(Addr {sym} base) -> (MOVDaddr {sym} base)
(LocalAddr {sym} base _) -> (MOVDaddr {sym} base)
(ITab (Load ptr mem)) -> (MOVDload ptr mem)

// block rewrites
(If (MOVDLT (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (LT cmp yes no)
(If (MOVDLE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (LE cmp yes no)
(If (MOVDGT (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GT cmp yes no)
(If (MOVDGE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GE cmp yes no)
(If (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (EQ cmp yes no)
(If (MOVDNE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (NE cmp yes no)

// Special case for floating point - LF/LEF not generated.
(If (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GTF cmp yes no)
(If (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GEF cmp yes no)

(If cond yes no) -> (NE (CMPWconst [0] (MOVBZreg <typ.Bool> cond)) yes no)

// Write barrier.
(WB {fn} destptr srcptr mem) -> (LoweredWB {fn} destptr srcptr mem)

(PanicBounds [kind] x y mem) && boundsABI(kind) == 0 -> (LoweredPanicBoundsA [kind] x y mem)
(PanicBounds [kind] x y mem) && boundsABI(kind) == 1 -> (LoweredPanicBoundsB [kind] x y mem)
(PanicBounds [kind] x y mem) && boundsABI(kind) == 2 -> (LoweredPanicBoundsC [kind] x y mem)

// ***************************
// Above: lowering rules
// Below: optimizations
// ***************************
// TODO: Should the optimizations be a separate pass?

// Note: when removing unnecessary sign/zero extensions.
//
// After a value is spilled it is restored using a sign- or zero-extension
// to register-width as appropriate for its type. For example, a uint8 will
// be restored using a MOVBZ (llgc) instruction which will zero extend the
// 8-bit value to 64-bits.
//
// This is a hazard when folding sign- and zero-extensions since we need to
// ensure not only that the value in the argument register is correctly
// extended but also that it will still be correctly extended if it is
// spilled and restored.
//
// In general this means we need type checks when the RHS of a rule is an
// OpCopy (i.e. "(... x:(...) ...) -> x").

// Merge double extensions.
(MOV(H|HZ)reg e:(MOV(B|BZ)reg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(W|WZ)reg e:(MOV(B|BZ)reg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(W|WZ)reg e:(MOV(H|HZ)reg x)) && clobberIfDead(e) -> (MOV(H|HZ)reg x)

// Bypass redundant sign extensions.
(MOV(B|BZ)reg e:(MOVBreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(B|BZ)reg e:(MOVHreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(B|BZ)reg e:(MOVWreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(H|HZ)reg e:(MOVHreg x)) && clobberIfDead(e) -> (MOV(H|HZ)reg x)
(MOV(H|HZ)reg e:(MOVWreg x)) && clobberIfDead(e) -> (MOV(H|HZ)reg x)
(MOV(W|WZ)reg e:(MOVWreg x)) && clobberIfDead(e) -> (MOV(W|WZ)reg x)

// Bypass redundant zero extensions.
(MOV(B|BZ)reg e:(MOVBZreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(B|BZ)reg e:(MOVHZreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(B|BZ)reg e:(MOVWZreg x)) && clobberIfDead(e) -> (MOV(B|BZ)reg x)
(MOV(H|HZ)reg e:(MOVHZreg x)) && clobberIfDead(e) -> (MOV(H|HZ)reg x)
(MOV(H|HZ)reg e:(MOVWZreg x)) && clobberIfDead(e) -> (MOV(H|HZ)reg x)
(MOV(W|WZ)reg e:(MOVWZreg x)) && clobberIfDead(e) -> (MOV(W|WZ)reg x)

// Remove zero extensions after zero extending load.
// Note: take care that if x is spilled it is restored correctly.
(MOV(B|H|W)Zreg x:(MOVBZload    _   _)) && (!x.Type.IsSigned() || x.Type.Size() > 1) -> x
(MOV(B|H|W)Zreg x:(MOVBZloadidx _ _ _)) && (!x.Type.IsSigned() || x.Type.Size() > 1) -> x
(MOV(H|W)Zreg   x:(MOVHZload    _   _)) && (!x.Type.IsSigned() || x.Type.Size() > 2) -> x
(MOV(H|W)Zreg   x:(MOVHZloadidx _ _ _)) && (!x.Type.IsSigned() || x.Type.Size() > 2) -> x
(MOVWZreg       x:(MOVWZload    _   _)) && (!x.Type.IsSigned() || x.Type.Size() > 4) -> x
(MOVWZreg       x:(MOVWZloadidx _ _ _)) && (!x.Type.IsSigned() || x.Type.Size() > 4) -> x

// Remove sign extensions after sign extending load.
// Note: take care that if x is spilled it is restored correctly.
(MOV(B|H|W)reg x:(MOVBload    _   _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x
(MOV(B|H|W)reg x:(MOVBloadidx _ _ _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x
(MOV(H|W)reg   x:(MOVHload    _   _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x
(MOV(H|W)reg   x:(MOVHloadidx _ _ _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x
(MOVWreg       x:(MOVWload    _   _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x
(MOVWreg       x:(MOVWloadidx _ _ _)) && (x.Type.IsSigned() || x.Type.Size() == 8) -> x

// Remove sign extensions after zero extending load.
// These type checks are probably unnecessary but do them anyway just in case.
(MOV(H|W)reg x:(MOVBZload    _   _)) && (!x.Type.IsSigned() || x.Type.Size() > 1) -> x
(MOV(H|W)reg x:(MOVBZloadidx _ _ _)) && (!x.Type.IsSigned() || x.Type.Size() > 1) -> x
(MOVWreg     x:(MOVHZload    _   _)) && (!x.Type.IsSigned() || x.Type.Size() > 2) -> x
(MOVWreg     x:(MOVHZloadidx _ _ _)) && (!x.Type.IsSigned() || x.Type.Size() > 2) -> x

// Fold sign and zero extensions into loads.
//
// Note: The combined instruction must end up in the same block
// as the original load. If not, we end up making a value with
// memory type live in two different blocks, which can lead to
// multiple memory values alive simultaneously.
//
// Make sure we don't combine these ops if the load has another use.
// This prevents a single load from being split into multiple loads
// which then might return different values.  See test/atomicload.go.
(MOV(B|H|W)Zreg <t> x:(MOV(B|H|W)load [o] {s} p mem))
  && x.Uses == 1
  && clobber(x)
  -> @x.Block (MOV(B|H|W)Zload <t> [o] {s} p mem)
(MOV(B|H|W)reg <t> x:(MOV(B|H|W)Zload [o] {s} p mem))
  && x.Uses == 1
  && clobber(x)
  -> @x.Block (MOV(B|H|W)load <t> [o] {s} p mem)
(MOV(B|H|W)Zreg <t> x:(MOV(B|H|W)loadidx [o] {s} p i mem))
  && x.Uses == 1
  && clobber(x)
  -> @x.Block (MOV(B|H|W)Zloadidx <t> [o] {s} p i mem)
(MOV(B|H|W)reg <t> x:(MOV(B|H|W)Zloadidx [o] {s} p i mem))
  && x.Uses == 1
  && clobber(x)
  -> @x.Block (MOV(B|H|W)loadidx <t> [o] {s} p i mem)

// Remove zero extensions after argument load.
(MOVBZreg x:(Arg <t>)) && !t.IsSigned() && t.Size() == 1 -> x
(MOVHZreg x:(Arg <t>)) && !t.IsSigned() && t.Size() <= 2 -> x
(MOVWZreg x:(Arg <t>)) && !t.IsSigned() && t.Size() <= 4 -> x

// Remove sign extensions after argument load.
(MOVBreg x:(Arg <t>)) && t.IsSigned() && t.Size() == 1 -> x
(MOVHreg x:(Arg <t>)) && t.IsSigned() && t.Size() <= 2 -> x
(MOVWreg x:(Arg <t>)) && t.IsSigned() && t.Size() <= 4 -> x

// Fold zero extensions into constants.
(MOVBZreg (MOVDconst [c])) -> (MOVDconst [int64( uint8(c))])
(MOVHZreg (MOVDconst [c])) -> (MOVDconst [int64(uint16(c))])
(MOVWZreg (MOVDconst [c])) -> (MOVDconst [int64(uint32(c))])

// Fold sign extensions into constants.
(MOVBreg (MOVDconst [c])) -> (MOVDconst [int64( int8(c))])
(MOVHreg (MOVDconst [c])) -> (MOVDconst [int64(int16(c))])
(MOVWreg (MOVDconst [c])) -> (MOVDconst [int64(int32(c))])

// Remove zero extension of conditional move.
// Note: only for MOVBZreg for now since it is added as part of 'if' statement lowering.
(MOVBZreg x:(MOVD(LT|LE|GT|GE|EQ|NE|GTnoinv|GEnoinv) (MOVDconst [c]) (MOVDconst [d]) _))
  && int64(uint8(c)) == c
  && int64(uint8(d)) == d
  && (!x.Type.IsSigned() || x.Type.Size() > 1)
  -> x

// Fold boolean tests into blocks.
(NE (CMPWconst [0] (MOVDLT (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (LT cmp yes no)
(NE (CMPWconst [0] (MOVDLE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (LE cmp yes no)
(NE (CMPWconst [0] (MOVDGT (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GT cmp yes no)
(NE (CMPWconst [0] (MOVDGE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GE cmp yes no)
(NE (CMPWconst [0] (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (EQ cmp yes no)
(NE (CMPWconst [0] (MOVDNE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (NE cmp yes no)
(NE (CMPWconst [0] (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GTF cmp yes no)
(NE (CMPWconst [0] (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GEF cmp yes no)

// Fold constants into instructions.
(ADD x (MOVDconst [c])) && is32Bit(c) -> (ADDconst [c] x)
(ADDW x (MOVDconst [c])) -> (ADDWconst [int64(int32(c))] x)

(SUB x (MOVDconst [c])) && is32Bit(c) -> (SUBconst x [c])
(SUB (MOVDconst [c]) x) && is32Bit(c) -> (NEG (SUBconst <v.Type> x [c]))
(SUBW x (MOVDconst [c])) -> (SUBWconst x [int64(int32(c))])
(SUBW (MOVDconst [c]) x) -> (NEGW (SUBWconst <v.Type> x [int64(int32(c))]))

(MULLD x (MOVDconst [c])) && is32Bit(c) -> (MULLDconst [c] x)
(MULLW x (MOVDconst [c])) -> (MULLWconst [int64(int32(c))] x)

// NILF instructions leave the high 32 bits unchanged which is
// equivalent to the leftmost 32 bits being set.
// TODO(mundaym): modify the assembler to accept 64-bit values
// and use isU32Bit(^c).
(AND x (MOVDconst [c])) && is32Bit(c) && c < 0 -> (ANDconst [c] x)
(AND x (MOVDconst [c])) && is32Bit(c) && c >= 0 -> (MOVWZreg (ANDWconst <typ.UInt32> [int64(int32(c))] x))
(ANDW x (MOVDconst [c])) -> (ANDWconst [int64(int32(c))] x)

(ANDWconst [c] (ANDWconst [d] x)) -> (ANDWconst [c & d] x)
(ANDconst [c] (ANDconst [d] x)) -> (ANDconst [c & d] x)

(OR x (MOVDconst [c])) && isU32Bit(c) -> (ORconst [c] x)
(ORW x (MOVDconst [c])) -> (ORWconst [int64(int32(c))] x)

(XOR x (MOVDconst [c])) && isU32Bit(c) -> (XORconst [c] x)
(XORW x (MOVDconst [c])) -> (XORWconst [int64(int32(c))] x)

// Constant shifts.
(S(LD|RD|RAD|LW|RW|RAW) x (MOVDconst [c]))
	-> (S(LD|RD|RAD|LW|RW|RAW)const x [c&63])

// Shifts only use the rightmost 6 bits of the shift value.
(S(LD|RD|RAD|LW|RW|RAW) x (AND (MOVDconst [c]) y))
	-> (S(LD|RD|RAD|LW|RW|RAW) x (ANDWconst <typ.UInt32> [c&63] y))
(S(LD|RD|RAD|LW|RW|RAW) x (ANDWconst [c] y)) && c&63 == 63
	-> (S(LD|RD|RAD|LW|RW|RAW) x y)
(SLD  x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SLD  x y)
(SRD  x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SRD  x y)
(SRAD x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SRAD x y)
(SLW  x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SLW  x y)
(SRW  x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SRW  x y)
(SRAW x (MOV(W|H|B|WZ|HZ|BZ)reg y)) -> (SRAW x y)

// Constant rotate generation
(RLL  x (MOVDconst [c])) -> (RLLconst  x [c&31])
(RLLG x (MOVDconst [c])) -> (RLLGconst x [c&63])

(ADD (SLDconst x [c]) (SRDconst x [d])) && d == 64-c -> (RLLGconst [c] x)
( OR (SLDconst x [c]) (SRDconst x [d])) && d == 64-c -> (RLLGconst [c] x)
(XOR (SLDconst x [c]) (SRDconst x [d])) && d == 64-c -> (RLLGconst [c] x)

(ADDW (SLWconst x [c]) (SRWconst x [d])) && d == 32-c -> (RLLconst [c] x)
( ORW (SLWconst x [c]) (SRWconst x [d])) && d == 32-c -> (RLLconst [c] x)
(XORW (SLWconst x [c]) (SRWconst x [d])) && d == 32-c -> (RLLconst [c] x)

(CMP x (MOVDconst [c])) && is32Bit(c) -> (CMPconst x [c])
(CMP (MOVDconst [c]) x) && is32Bit(c) -> (InvertFlags (CMPconst x [c]))
(CMPW x (MOVDconst [c])) -> (CMPWconst x [int64(int32(c))])
(CMPW (MOVDconst [c]) x) -> (InvertFlags (CMPWconst x [int64(int32(c))]))
(CMPU x (MOVDconst [c])) && isU32Bit(c) -> (CMPUconst x [int64(int32(c))])
(CMPU (MOVDconst [c]) x) && isU32Bit(c) -> (InvertFlags (CMPUconst x [int64(int32(c))]))
(CMPWU x (MOVDconst [c])) -> (CMPWUconst x [int64(int32(c))])
(CMPWU (MOVDconst [c]) x) -> (InvertFlags (CMPWUconst x [int64(int32(c))]))

// Using MOV{W,H,B}Zreg instead of AND is cheaper.
(AND x (MOVDconst [0xFF])) -> (MOVBZreg x)
(AND x (MOVDconst [0xFFFF])) -> (MOVHZreg x)
(AND x (MOVDconst [0xFFFFFFFF])) -> (MOVWZreg x)
(ANDWconst [0xFF] x) -> (MOVBZreg x)
(ANDWconst [0xFFFF] x) -> (MOVHZreg x)

// strength reduction
(MULLDconst [-1] x) -> (NEG x)
(MULLDconst [0] _) -> (MOVDconst [0])
(MULLDconst [1] x) -> x
(MULLDconst [c] x) && isPowerOfTwo(c) -> (SLDconst [log2(c)] x)
(MULLDconst [c] x) && isPowerOfTwo(c+1) && c >= 15 -> (SUB (SLDconst <v.Type> [log2(c+1)] x) x)
(MULLDconst [c] x) && isPowerOfTwo(c-1) && c >= 17 -> (ADD (SLDconst <v.Type> [log2(c-1)] x) x)

(MULLWconst [-1] x) -> (NEGW x)
(MULLWconst [0] _) -> (MOVDconst [0])
(MULLWconst [1] x) -> x
(MULLWconst [c] x) && isPowerOfTwo(c) -> (SLWconst [log2(c)] x)
(MULLWconst [c] x) && isPowerOfTwo(c+1) && c >= 15 -> (SUBW (SLWconst <v.Type> [log2(c+1)] x) x)
(MULLWconst [c] x) && isPowerOfTwo(c-1) && c >= 17 -> (ADDW (SLWconst <v.Type> [log2(c-1)] x) x)

// Fold ADD into MOVDaddr. Odd offsets from SB shouldn't be folded (LARL can't handle them).
(ADDconst [c] (MOVDaddr [d] {s} x:(SB))) && ((c+d)&1 == 0) && is32Bit(c+d) -> (MOVDaddr [c+d] {s} x)
(ADDconst [c] (MOVDaddr [d] {s} x)) && x.Op != OpSB && is20Bit(c+d) -> (MOVDaddr [c+d] {s} x)
(ADD idx (MOVDaddr [c] {s} ptr)) && ptr.Op != OpSB && idx.Op != OpSB -> (MOVDaddridx [c] {s} ptr idx)

// fold ADDconst into MOVDaddrx
(ADDconst [c] (MOVDaddridx [d] {s} x y)) && is20Bit(c+d) -> (MOVDaddridx [c+d] {s} x y)
(MOVDaddridx [c] {s} (ADDconst [d] x) y) && is20Bit(c+d) && x.Op != OpSB -> (MOVDaddridx [c+d] {s} x y)
(MOVDaddridx [c] {s} x (ADDconst [d] y)) && is20Bit(c+d) && y.Op != OpSB -> (MOVDaddridx [c+d] {s} x y)

// reverse ordering of compare instruction
(MOVDLT x y (InvertFlags cmp)) -> (MOVDGT x y cmp)
(MOVDGT x y (InvertFlags cmp)) -> (MOVDLT x y cmp)
(MOVDLE x y (InvertFlags cmp)) -> (MOVDGE x y cmp)
(MOVDGE x y (InvertFlags cmp)) -> (MOVDLE x y cmp)
(MOVDEQ x y (InvertFlags cmp)) -> (MOVDEQ x y cmp)
(MOVDNE x y (InvertFlags cmp)) -> (MOVDNE x y cmp)

// replace load from same location as preceding store with copy
(MOVDload  [off] {sym} ptr1 (MOVDstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> x
(MOVWload  [off] {sym} ptr1 (MOVWstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVWreg x)
(MOVHload  [off] {sym} ptr1 (MOVHstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVHreg x)
(MOVBload  [off] {sym} ptr1 (MOVBstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVBreg x)
(MOVWZload [off] {sym} ptr1 (MOVWstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVWZreg x)
(MOVHZload [off] {sym} ptr1 (MOVHstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVHZreg x)
(MOVBZload [off] {sym} ptr1 (MOVBstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (MOVBZreg x)
(MOVDload  [off] {sym} ptr1 (FMOVDstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (LGDR x)
(FMOVDload [off] {sym} ptr1 (MOVDstore  [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> (LDGR x)
(FMOVDload [off] {sym} ptr1 (FMOVDstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> x
(FMOVSload [off] {sym} ptr1 (FMOVSstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) -> x

// prefer FPR <-> GPR moves over combined load ops
(MULLDload <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (MULLD x (LGDR <t> y))
(ADDload   <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (ADD   x (LGDR <t> y))
(SUBload   <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (SUB   x (LGDR <t> y))
(ORload    <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (OR    x (LGDR <t> y))
(ANDload   <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (AND   x (LGDR <t> y))
(XORload   <t> [off] {sym} x ptr1 (FMOVDstore [off] {sym} ptr2 y _)) && isSamePtr(ptr1, ptr2) -> (XOR   x (LGDR <t> y))

// detect attempts to set/clear the sign bit
// may need to be reworked when NIHH/OIHH are added
(SRDconst [1] (SLDconst [1] (LGDR <t> x))) -> (LGDR <t> (LPDFR <x.Type> x))
(LDGR <t> (SRDconst [1] (SLDconst [1] x))) -> (LPDFR (LDGR <t> x))
(OR (MOVDconst [-1<<63]) (LGDR <t> x))     -> (LGDR <t> (LNDFR <x.Type> x))
(LDGR <t> (OR (MOVDconst [-1<<63]) x))     -> (LNDFR (LDGR <t> x))

// detect attempts to set the sign bit with load
(LDGR <t> x:(ORload <t1> [off] {sym} (MOVDconst [-1<<63]) ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (LNDFR <t> (LDGR <t> (MOVDload <t1> [off] {sym} ptr mem)))

// detect copysign
(OR (SLDconst [63] (SRDconst [63] (LGDR x))) (LGDR (LPDFR <t> y))) -> (LGDR (CPSDR <t> y x))
(OR (SLDconst [63] (SRDconst [63] (LGDR x))) (MOVDconst [c])) && c & -1<<63 == 0 -> (LGDR (CPSDR <x.Type> (FMOVDconst <x.Type> [c]) x))
(CPSDR y (FMOVDconst [c])) && c & -1<<63 == 0 -> (LPDFR y)
(CPSDR y (FMOVDconst [c])) && c & -1<<63 != 0 -> (LNDFR y)

// absorb negations into set/clear sign bit
(FNEG  (LPDFR x)) -> (LNDFR x)
(FNEG  (LNDFR x)) -> (LPDFR x)
(FNEGS (LPDFR x)) -> (LNDFR x)
(FNEGS (LNDFR x)) -> (LPDFR x)

// no need to convert float32 to float64 to set/clear sign bit
(LEDBR (LPDFR (LDEBR x))) -> (LPDFR x)
(LEDBR (LNDFR (LDEBR x))) -> (LNDFR x)

// remove unnecessary FPR <-> GPR moves
(LDGR (LGDR x)) -> x
(LGDR (LDGR x)) -> x

// Don't extend before storing
(MOVWstore [off] {sym} ptr (MOVWreg x) mem) -> (MOVWstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVBreg x) mem) -> (MOVBstore [off] {sym} ptr x mem)
(MOVWstore [off] {sym} ptr (MOVWZreg x) mem) -> (MOVWstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHZreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVBZreg x) mem) -> (MOVBstore [off] {sym} ptr x mem)

// Fold constants into memory operations.
// Note that this is not always a good idea because if not all the uses of
// the ADDconst get eliminated, we still have to compute the ADDconst and we now
// have potentially two live values (ptr and (ADDconst [off] ptr)) instead of one.
// Nevertheless, let's do it!
(MOVDload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVDload  [off1+off2] {sym} ptr mem)
(MOVWload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVWload  [off1+off2] {sym} ptr mem)
(MOVHload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVHload  [off1+off2] {sym} ptr mem)
(MOVBload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVBload  [off1+off2] {sym} ptr mem)
(MOVWZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVWZload [off1+off2] {sym} ptr mem)
(MOVHZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVHZload [off1+off2] {sym} ptr mem)
(MOVBZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVBZload [off1+off2] {sym} ptr mem)
(FMOVSload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (FMOVSload [off1+off2] {sym} ptr mem)
(FMOVDload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (FMOVDload [off1+off2] {sym} ptr mem)

(MOVDstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVDstore  [off1+off2] {sym} ptr val mem)
(MOVWstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVWstore  [off1+off2] {sym} ptr val mem)
(MOVHstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVHstore  [off1+off2] {sym} ptr val mem)
(MOVBstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVBstore  [off1+off2] {sym} ptr val mem)
(FMOVSstore [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (FMOVSstore [off1+off2] {sym} ptr val mem)
(FMOVDstore [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (FMOVDstore [off1+off2] {sym} ptr val mem)

(ADDload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ADDload   [off1+off2] {sym} x ptr mem)
(ADDWload  [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ADDWload  [off1+off2] {sym} x ptr mem)
(MULLDload [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (MULLDload [off1+off2] {sym} x ptr mem)
(MULLWload [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (MULLWload [off1+off2] {sym} x ptr mem)
(SUBload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (SUBload   [off1+off2] {sym} x ptr mem)
(SUBWload  [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (SUBWload  [off1+off2] {sym} x ptr mem)

(ANDload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ANDload   [off1+off2] {sym} x ptr mem)
(ANDWload  [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ANDWload  [off1+off2] {sym} x ptr mem)
(ORload    [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ORload    [off1+off2] {sym} x ptr mem)
(ORWload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (ORWload   [off1+off2] {sym} x ptr mem)
(XORload   [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (XORload   [off1+off2] {sym} x ptr mem)
(XORWload  [off1] {sym} x (ADDconst [off2] ptr) mem) && ptr.Op != OpSB && is20Bit(off1+off2) -> (XORWload  [off1+off2] {sym} x ptr mem)

// Fold constants into stores.
(MOVDstore [off] {sym} ptr (MOVDconst [c]) mem) && is16Bit(c) && isU12Bit(off) && ptr.Op != OpSB ->
	(MOVDstoreconst [makeValAndOff(c,off)] {sym} ptr mem)
(MOVWstore [off] {sym} ptr (MOVDconst [c]) mem) && is16Bit(c) && isU12Bit(off) && ptr.Op != OpSB ->
	(MOVWstoreconst [makeValAndOff(int64(int32(c)),off)] {sym} ptr mem)
(MOVHstore [off] {sym} ptr (MOVDconst [c]) mem) && isU12Bit(off) && ptr.Op != OpSB ->
	(MOVHstoreconst [makeValAndOff(int64(int16(c)),off)] {sym} ptr mem)
(MOVBstore [off] {sym} ptr (MOVDconst [c]) mem) && is20Bit(off) && ptr.Op != OpSB ->
	(MOVBstoreconst [makeValAndOff(int64(int8(c)),off)] {sym} ptr mem)

// Fold address offsets into constant stores.
(MOVDstoreconst [sc] {s} (ADDconst [off] ptr) mem) && isU12Bit(ValAndOff(sc).Off()+off) ->
	(MOVDstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVWstoreconst [sc] {s} (ADDconst [off] ptr) mem) && isU12Bit(ValAndOff(sc).Off()+off) ->
	(MOVWstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVHstoreconst [sc] {s} (ADDconst [off] ptr) mem) && isU12Bit(ValAndOff(sc).Off()+off) ->
	(MOVHstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVBstoreconst [sc] {s} (ADDconst [off] ptr) mem) && is20Bit(ValAndOff(sc).Off()+off) ->
	(MOVBstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)

// Merge address calculations into loads and stores.
// Offsets from SB must not be merged into unaligned memory accesses because
// loads/stores using PC-relative addressing directly must be aligned to the
// size of the target.
(MOVDload   [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%8 == 0 && (off1+off2)%8 == 0)) ->
	(MOVDload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVWZload  [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%4 == 0 && (off1+off2)%4 == 0)) ->
	(MOVWZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVHZload  [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%2 == 0 && (off1+off2)%2 == 0)) ->
	(MOVHZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVBZload  [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(FMOVSload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(FMOVDload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDload [off1+off2] {mergeSym(sym1,sym2)} base mem)

(MOVWload [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%4 == 0 && (off1+off2)%4 == 0)) ->
	(MOVWload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVHload [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%2 == 0 && (off1+off2)%2 == 0)) ->
	(MOVHload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVBload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBload [off1+off2] {mergeSym(sym1,sym2)} base mem)

(MOVDstore  [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%8 == 0 && (off1+off2)%8 == 0)) ->
	(MOVDstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVWstore  [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%4 == 0 && (off1+off2)%4 == 0)) ->
	(MOVWstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVHstore  [off1] {sym1} (MOVDaddr <t> [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && (base.Op != OpSB || (t.IsPtr() && t.Elem().Alignment()%2 == 0 && (off1+off2)%2 == 0)) ->
	(MOVHstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVBstore  [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(FMOVSstore [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSstore [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(FMOVDstore [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDstore [off1+off2] {mergeSym(sym1,sym2)} base val mem)

(ADDload   [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ADDload   [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(ADDWload  [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ADDWload  [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(MULLDload [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (MULLDload [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(MULLWload [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (MULLWload [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(SUBload   [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (SUBload   [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(SUBWload  [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (SUBWload  [o1+o2] {mergeSym(s1, s2)} x ptr mem)

(ANDload   [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ANDload   [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(ANDWload  [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ANDWload  [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(ORload    [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ORload    [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(ORWload   [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (ORWload   [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(XORload   [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (XORload   [o1+o2] {mergeSym(s1, s2)} x ptr mem)
(XORWload  [o1] {s1} x (MOVDaddr [o2] {s2} ptr) mem) && ptr.Op != OpSB && is20Bit(o1+o2) && canMergeSym(s1, s2) -> (XORWload  [o1+o2] {mergeSym(s1, s2)} x ptr mem)

// Cannot store constant to SB directly (no 'move relative long immediate' instructions).
(MOVDstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && ptr.Op != OpSB && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVDstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVWstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && ptr.Op != OpSB && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVWstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVHstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && ptr.Op != OpSB && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVHstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVBstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && ptr.Op != OpSB && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVBstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)

// generating indexed loads and stores
(MOVBZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVBload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVHZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVHload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVWZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVWload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVDload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(FMOVSload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(FMOVDload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)

(MOVBstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVHstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVWstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVDstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(FMOVSstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(FMOVDstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)

(MOVBZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVBZloadidx [off] {sym} ptr idx mem)
(MOVBload  [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVBloadidx  [off] {sym} ptr idx mem)
(MOVHZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVHZloadidx [off] {sym} ptr idx mem)
(MOVHload  [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVHloadidx  [off] {sym} ptr idx mem)
(MOVWZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVWZloadidx [off] {sym} ptr idx mem)
(MOVWload  [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVWloadidx  [off] {sym} ptr idx mem)
(MOVDload  [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVDloadidx  [off] {sym} ptr idx mem)
(FMOVSload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (FMOVSloadidx [off] {sym} ptr idx mem)
(FMOVDload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (FMOVDloadidx [off] {sym} ptr idx mem)

(MOVBstore  [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVBstoreidx  [off] {sym} ptr idx val mem)
(MOVHstore  [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVHstoreidx  [off] {sym} ptr idx val mem)
(MOVWstore  [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVWstoreidx  [off] {sym} ptr idx val mem)
(MOVDstore  [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVDstoreidx  [off] {sym} ptr idx val mem)
(FMOVSstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (FMOVSstoreidx [off] {sym} ptr idx val mem)
(FMOVDstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (FMOVDstoreidx [off] {sym} ptr idx val mem)

// combine ADD into indexed loads and stores
(MOVBZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVBZloadidx [c+d] {sym} ptr idx mem)
(MOVBloadidx  [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVBloadidx  [c+d] {sym} ptr idx mem)
(MOVHZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVHZloadidx [c+d] {sym} ptr idx mem)
(MOVHloadidx  [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVHloadidx  [c+d] {sym} ptr idx mem)
(MOVWZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVWZloadidx [c+d] {sym} ptr idx mem)
(MOVWloadidx  [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVWloadidx  [c+d] {sym} ptr idx mem)
(MOVDloadidx  [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (MOVDloadidx  [c+d] {sym} ptr idx mem)
(FMOVSloadidx [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (FMOVSloadidx [c+d] {sym} ptr idx mem)
(FMOVDloadidx [c] {sym} (ADDconst [d] ptr) idx mem) && is20Bit(c+d) -> (FMOVDloadidx [c+d] {sym} ptr idx mem)

(MOVBstoreidx  [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (MOVBstoreidx  [c+d] {sym} ptr idx val mem)
(MOVHstoreidx  [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (MOVHstoreidx  [c+d] {sym} ptr idx val mem)
(MOVWstoreidx  [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (MOVWstoreidx  [c+d] {sym} ptr idx val mem)
(MOVDstoreidx  [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (MOVDstoreidx  [c+d] {sym} ptr idx val mem)
(FMOVSstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (FMOVSstoreidx [c+d] {sym} ptr idx val mem)
(FMOVDstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) && is20Bit(c+d) -> (FMOVDstoreidx [c+d] {sym} ptr idx val mem)

(MOVBZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVBZloadidx [c+d] {sym} ptr idx mem)
(MOVBloadidx  [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVBloadidx  [c+d] {sym} ptr idx mem)
(MOVHZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVHZloadidx [c+d] {sym} ptr idx mem)
(MOVHloadidx  [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVHloadidx  [c+d] {sym} ptr idx mem)
(MOVWZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVWZloadidx [c+d] {sym} ptr idx mem)
(MOVWloadidx  [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVWloadidx  [c+d] {sym} ptr idx mem)
(MOVDloadidx  [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (MOVDloadidx  [c+d] {sym} ptr idx mem)
(FMOVSloadidx [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (FMOVSloadidx [c+d] {sym} ptr idx mem)
(FMOVDloadidx [c] {sym} ptr (ADDconst [d] idx) mem) && is20Bit(c+d) -> (FMOVDloadidx [c+d] {sym} ptr idx mem)

(MOVBstoreidx  [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (MOVBstoreidx  [c+d] {sym} ptr idx val mem)
(MOVHstoreidx  [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (MOVHstoreidx  [c+d] {sym} ptr idx val mem)
(MOVWstoreidx  [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (MOVWstoreidx  [c+d] {sym} ptr idx val mem)
(MOVDstoreidx  [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (MOVDstoreidx  [c+d] {sym} ptr idx val mem)
(FMOVSstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (FMOVSstoreidx [c+d] {sym} ptr idx val mem)
(FMOVDstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) && is20Bit(c+d) -> (FMOVDstoreidx [c+d] {sym} ptr idx val mem)

// MOVDaddr into MOVDaddridx
(MOVDaddridx [off1] {sym1} (MOVDaddr [off2] {sym2} x) y) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && x.Op != OpSB ->
       (MOVDaddridx [off1+off2] {mergeSym(sym1,sym2)} x y)
(MOVDaddridx [off1] {sym1} x (MOVDaddr [off2] {sym2} y)) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && y.Op != OpSB ->
       (MOVDaddridx [off1+off2] {mergeSym(sym1,sym2)} x y)

// Absorb InvertFlags into branches.
((LT|GT|LE|GE|EQ|NE) (InvertFlags cmp) yes no) -> ((GT|LT|GE|LE|EQ|NE) cmp yes no)

// Constant comparisons.
(CMPconst (MOVDconst [x]) [y]) && x==y -> (FlagEQ)
(CMPconst (MOVDconst [x]) [y]) && x<y -> (FlagLT)
(CMPconst (MOVDconst [x]) [y]) && x>y -> (FlagGT)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)==uint64(y) -> (FlagEQ)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)<uint64(y) -> (FlagLT)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)>uint64(y) -> (FlagGT)

(CMPWconst (MOVDconst [x]) [y]) && int32(x)==int32(y) -> (FlagEQ)
(CMPWconst (MOVDconst [x]) [y]) && int32(x)<int32(y) -> (FlagLT)
(CMPWconst (MOVDconst [x]) [y]) && int32(x)>int32(y) -> (FlagGT)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)==uint32(y) -> (FlagEQ)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)<uint32(y) -> (FlagLT)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)>uint32(y) -> (FlagGT)

(CMP(W|WU)const (MOVBZreg _) [c]) &&   0xff < c -> (FlagLT)
(CMP(W|WU)const (MOVHZreg _) [c]) && 0xffff < c -> (FlagLT)

(CMPconst  (SRDconst _ [c]) [n]) && c > 0 && n < 0 -> (FlagGT)
(CMPWconst (SRWconst _ [c]) [n]) && c > 0 && n < 0 -> (FlagGT)

(CMPUconst  (SRDconst _ [c]) [n]) && c > 0 && c < 64 && (1<<uint(64-c)) <= uint64(n) -> (FlagLT)
(CMPWUconst (SRWconst _ [c]) [n]) && c > 0 && c < 32 && (1<<uint(32-c)) <= uint32(n) -> (FlagLT)

(CMPWconst  (ANDWconst _ [m]) [n]) && int32(m) >= 0 &&  int32(m) <  int32(n) -> (FlagLT)
(CMPWUconst (ANDWconst _ [m]) [n]) && uint32(m) < uint32(n) -> (FlagLT)

// Convert 64-bit comparisons to 32-bit comparisons and signed comparisons
// to unsigned comparisons.
// Helps simplify constant comparison detection.
(CM(P|PU)const (MOV(W|WZ)reg x) [c]) -> (CMP(W|WU)const x [c])
(CM(P|P|PU|PU)const x:(MOV(H|HZ|H|HZ)reg _) [c]) -> (CMP(W|W|WU|WU)const x [c])
(CM(P|P|PU|PU)const x:(MOV(B|BZ|B|BZ)reg _) [c]) -> (CMP(W|W|WU|WU)const x [c])
(CMPconst  (MOV(WZ|W)reg x:(ANDWconst [m] _)) [c]) && int32(m) >= 0 && c >= 0 -> (CMPWUconst x [c])
(CMPUconst (MOV(WZ|W)reg x:(ANDWconst [m] _)) [c]) && int32(m) >= 0           -> (CMPWUconst x [c])
(CMPconst  x:(SRDconst _ [c]) [n]) && c > 0 && n >= 0 -> (CMPUconst  x [n])
(CMPWconst x:(SRWconst _ [c]) [n]) && c > 0 && n >= 0 -> (CMPWUconst x [n])

// Absorb sign and zero extensions into 32-bit comparisons.
(CMP(W|W|WU|WU)      x (MOV(W|WZ|W|WZ)reg y))   -> (CMP(W|W|WU|WU) x y)
(CMP(W|W|WU|WU)      (MOV(W|WZ|W|WZ)reg x) y)   -> (CMP(W|W|WU|WU) x y)
(CMP(W|W|WU|WU)const (MOV(W|WZ|W|WZ)reg x) [c]) -> (CMP(W|W|WU|WU)const x [c])

// Absorb flag constants into branches.
(EQ (FlagEQ) yes no) -> (First nil yes no)
(EQ (FlagLT) yes no) -> (First nil no yes)
(EQ (FlagGT) yes no) -> (First nil no yes)

(NE (FlagEQ) yes no) -> (First nil no yes)
(NE (FlagLT) yes no) -> (First nil yes no)
(NE (FlagGT) yes no) -> (First nil yes no)

(LT (FlagEQ) yes no) -> (First nil no yes)
(LT (FlagLT) yes no) -> (First nil yes no)
(LT (FlagGT) yes no) -> (First nil no yes)

(LE (FlagEQ) yes no) -> (First nil yes no)
(LE (FlagLT) yes no) -> (First nil yes no)
(LE (FlagGT) yes no) -> (First nil no yes)

(GT (FlagEQ) yes no) -> (First nil no yes)
(GT (FlagLT) yes no) -> (First nil no yes)
(GT (FlagGT) yes no) -> (First nil yes no)

(GE (FlagEQ) yes no) -> (First nil yes no)
(GE (FlagLT) yes no) -> (First nil no yes)
(GE (FlagGT) yes no) -> (First nil yes no)

// Absorb flag constants into SETxx ops.
(MOVDEQ _ x (FlagEQ)) -> x
(MOVDEQ y _ (FlagLT)) -> y
(MOVDEQ y _ (FlagGT)) -> y

(MOVDNE y _ (FlagEQ)) -> y
(MOVDNE _ x (FlagLT)) -> x
(MOVDNE _ x (FlagGT)) -> x

(MOVDLT y _ (FlagEQ)) -> y
(MOVDLT _ x (FlagLT)) -> x
(MOVDLT y _ (FlagGT)) -> y

(MOVDLE _ x (FlagEQ)) -> x
(MOVDLE _ x (FlagLT)) -> x
(MOVDLE y _ (FlagGT)) -> y

(MOVDGT y _ (FlagEQ)) -> y
(MOVDGT y _ (FlagLT)) -> y
(MOVDGT _ x (FlagGT)) -> x

(MOVDGE _ x (FlagEQ)) -> x
(MOVDGE y _ (FlagLT)) -> y
(MOVDGE _ x (FlagGT)) -> x

// Remove redundant *const ops
(ADDconst [0] x) -> x
(ADDWconst [c] x) && int32(c)==0 -> x
(SUBconst [0] x) -> x
(SUBWconst [c] x) && int32(c) == 0 -> x
(ANDconst [0] _)                 -> (MOVDconst [0])
(ANDWconst [c] _) && int32(c)==0  -> (MOVDconst [0])
(ANDconst [-1] x)                -> x
(ANDWconst [c] x) && int32(c)==-1 -> x
(ORconst [0] x)                  -> x
(ORWconst [c] x) && int32(c)==0   -> x
(ORconst [-1] _)                 -> (MOVDconst [-1])
(ORWconst [c] _) && int32(c)==-1  -> (MOVDconst [-1])
(XORconst [0] x)                  -> x
(XORWconst [c] x) && int32(c)==0   -> x

// Convert constant subtracts to constant adds.
(SUBconst [c] x) && c != -(1<<31) -> (ADDconst [-c] x)
(SUBWconst [c] x) -> (ADDWconst [int64(int32(-c))] x)

// generic constant folding
// TODO: more of this
(ADDconst [c] (MOVDconst [d])) -> (MOVDconst [c+d])
(ADDWconst [c] (MOVDconst [d])) -> (MOVDconst [int64(int32(c+d))])
(ADDconst [c] (ADDconst [d] x)) && is32Bit(c+d) -> (ADDconst [c+d] x)
(ADDWconst [c] (ADDWconst [d] x)) -> (ADDWconst [int64(int32(c+d))] x)
(SUBconst (MOVDconst [d]) [c]) -> (MOVDconst [d-c])
(SUBconst (SUBconst x [d]) [c]) && is32Bit(-c-d) -> (ADDconst [-c-d] x)
(SRADconst [c] (MOVDconst [d])) -> (MOVDconst [d>>uint64(c)])
(SRAWconst [c] (MOVDconst [d])) -> (MOVDconst [int64(int32(d))>>uint64(c)])
(NEG (MOVDconst [c])) -> (MOVDconst [-c])
(NEGW (MOVDconst [c])) -> (MOVDconst [int64(int32(-c))])
(MULLDconst [c] (MOVDconst [d])) -> (MOVDconst [c*d])
(MULLWconst [c] (MOVDconst [d])) -> (MOVDconst [int64(int32(c*d))])
(AND (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c&d])
(ANDconst [c] (MOVDconst [d])) -> (MOVDconst [c&d])
(ANDWconst [c] (MOVDconst [d])) -> (MOVDconst [c&d])
(OR (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c|d])
(ORconst [c] (MOVDconst [d])) -> (MOVDconst [c|d])
(ORWconst [c] (MOVDconst [d])) -> (MOVDconst [c|d])
(XOR (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c^d])
(XORconst [c] (MOVDconst [d])) -> (MOVDconst [c^d])
(XORWconst [c] (MOVDconst [d])) -> (MOVDconst [c^d])
(LoweredRound32F x:(FMOVSconst)) -> x
(LoweredRound64F x:(FMOVDconst)) -> x

// generic simplifications
// TODO: more of this
(ADD x (NEG y)) -> (SUB x y)
(ADDW x (NEGW y)) -> (SUBW x y)
(SUB x x) -> (MOVDconst [0])
(SUBW x x) -> (MOVDconst [0])
(AND x x) -> x
(ANDW x x) -> x
(OR x x) -> x
(ORW x x) -> x
(XOR x x) -> (MOVDconst [0])
(XORW x x) -> (MOVDconst [0])
(NEG (ADDconst [c] (NEG x))) && c != -(1<<31) -> (ADDconst [-c] x)
(MOVBZreg (ANDWconst [m] x)) -> (MOVWZreg (ANDWconst <typ.UInt32> [int64( uint8(m))] x))
(MOVHZreg (ANDWconst [m] x)) -> (MOVWZreg (ANDWconst <typ.UInt32> [int64(uint16(m))] x))
(MOVBreg  (ANDWconst [m] x)) &&  int8(m) >= 0 -> (MOVWZreg (ANDWconst <typ.UInt32> [int64( uint8(m))] x))
(MOVHreg  (ANDWconst [m] x)) && int16(m) >= 0 -> (MOVWZreg (ANDWconst <typ.UInt32> [int64(uint16(m))] x))

// carry flag generation
// (only constant fold carry of zero)
(Select1 (ADDCconst (MOVDconst [c]) [d]))
  && uint64(c+d) >= uint64(c) && c+d == 0
  -> (FlagEQ)
(Select1 (ADDCconst (MOVDconst [c]) [d]))
  && uint64(c+d) >= uint64(c) && c+d != 0
  -> (FlagLT)

// borrow flag generation
// (only constant fold borrow of zero)
(Select1 (SUBC (MOVDconst [c]) (MOVDconst [d])))
  && uint64(d) <= uint64(c) && c-d == 0
  -> (FlagGT)
(Select1 (SUBC (MOVDconst [c]) (MOVDconst [d])))
  && uint64(d) <= uint64(c) && c-d != 0
  -> (FlagOV)

// add with carry
(ADDE x y (FlagEQ)) -> (ADDC x y)
(ADDE x y (FlagLT)) -> (ADDC x y)
(ADDC x (MOVDconst [c])) && is16Bit(c) -> (ADDCconst x [c])
(Select0 (ADDCconst (MOVDconst [c]) [d])) -> (MOVDconst [c+d])

// subtract with borrow
(SUBE x y (FlagGT)) -> (SUBC x y)
(SUBE x y (FlagOV)) -> (SUBC x y)
(Select0 (SUBC (MOVDconst [c]) (MOVDconst [d]))) -> (MOVDconst [c-d])

// collapse carry chain
(ADDE x y (Select1 (ADDCconst [-1] (Select0 (ADDE (MOVDconst [0]) (MOVDconst [0]) c)))))
  -> (ADDE x y c)

// collapse borrow chain
(SUBE x y (Select1 (SUBC (MOVDconst [0]) (NEG (Select0 (SUBE (MOVDconst [0]) (MOVDconst [0]) c))))))
  -> (SUBE x y c)

// fused multiply-add
(FADD (FMUL y z) x) -> (FMADD x y z)
(FADDS (FMULS y z) x) -> (FMADDS x y z)
(FSUB (FMUL y z) x) -> (FMSUB x y z)
(FSUBS (FMULS y z) x) -> (FMSUBS x y z)

// Fold memory operations into operations.
// Exclude global data (SB) because these instructions cannot handle relative addresses.
// TODO(mundaym): use LARL in the assembler to handle SB?
// TODO(mundaym): indexed versions of these?
(ADD <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDload <t> [off] {sym} x ptr mem)
(ADD <t> g:(MOVDload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDload <t> [off] {sym} x ptr mem)
(ADDW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> g:(MOVWload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> g:(MOVWZload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(MULLD <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLDload <t> [off] {sym} x ptr mem)
(MULLD <t> g:(MOVDload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLDload <t> [off] {sym} x ptr mem)
(MULLW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> g:(MOVWload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> g:(MOVWZload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(SUB <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (SUBload <t> [off] {sym} x ptr mem)
(SUBW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (SUBWload <t> [off] {sym} x ptr mem)
(SUBW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (SUBWload <t> [off] {sym} x ptr mem)
(AND <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDload <t> [off] {sym} x ptr mem)
(AND <t> g:(MOVDload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDload <t> [off] {sym} x ptr mem)
(ANDW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> g:(MOVWload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> g:(MOVWZload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(OR <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORload <t> [off] {sym} x ptr mem)
(OR <t> g:(MOVDload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORload <t> [off] {sym} x ptr mem)
(ORW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> g:(MOVWload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> g:(MOVWZload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(XOR <t> x g:(MOVDload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORload <t> [off] {sym} x ptr mem)
(XOR <t> g:(MOVDload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORload <t> [off] {sym} x ptr mem)
(XORW <t> x g:(MOVWload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> g:(MOVWload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> x g:(MOVWZload [off] {sym} ptr mem)) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> g:(MOVWZload [off] {sym} ptr mem) x) && ptr.Op != OpSB && is20Bit(off) && canMergeLoadClobber(v, g, x) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)

// Combine constant stores into larger (unaligned) stores.
// Avoid SB because constant stores to relative offsets are
// emulated by the assembler and also can't handle unaligned offsets.
(MOVBstoreconst [c] {s} p x:(MOVBstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 1 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVHstoreconst [makeValAndOff(ValAndOff(c).Val()&0xff | ValAndOff(a).Val()<<8, ValAndOff(a).Off())] {s} p mem)
(MOVHstoreconst [c] {s} p x:(MOVHstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 2 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVWstore [ValAndOff(a).Off()] {s} p (MOVDconst [int64(int32(ValAndOff(c).Val()&0xffff | ValAndOff(a).Val()<<16))]) mem)
(MOVWstoreconst [c] {s} p x:(MOVWstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 4 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVDstore [ValAndOff(a).Off()] {s} p (MOVDconst [ValAndOff(c).Val()&0xffffffff | ValAndOff(a).Val()<<32]) mem)

// Combine stores into larger (unaligned) stores.
// It doesn't work on global data (based on SB) because stores with relative addressing
// require that the memory operand be aligned.
(MOVBstore [i] {s} p w x:(MOVBstore [i-1] {s} p (SRDconst [8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p w0:(SRDconst [j] w) x:(MOVBstore [i-1] {s} p (SRDconst [j+8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w0 mem)
(MOVBstore [i] {s} p w x:(MOVBstore [i-1] {s} p (SRWconst [8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p w0:(SRWconst [j] w) x:(MOVBstore [i-1] {s} p (SRWconst [j+8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w0 mem)
(MOVHstore [i] {s} p w x:(MOVHstore [i-2] {s} p (SRDconst [16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w mem)
(MOVHstore [i] {s} p w0:(SRDconst [j] w) x:(MOVHstore [i-2] {s} p (SRDconst [j+16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w0 mem)
(MOVHstore [i] {s} p w x:(MOVHstore [i-2] {s} p (SRWconst [16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w mem)
(MOVHstore [i] {s} p w0:(SRWconst [j] w) x:(MOVHstore [i-2] {s} p (SRWconst [j+16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w0 mem)
(MOVWstore [i] {s} p (SRDconst [32] w) x:(MOVWstore [i-4] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstore [i-4] {s} p w mem)
(MOVWstore [i] {s} p w0:(SRDconst [j] w) x:(MOVWstore [i-4] {s} p (SRDconst [j+32] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstore [i-4] {s} p w0 mem)

(MOVBstoreidx [i] {s} p idx w x:(MOVBstoreidx [i-1] {s} p idx (SRDconst [8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx (SRDconst [j+8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w0 mem)
(MOVBstoreidx [i] {s} p idx w x:(MOVBstoreidx [i-1] {s} p idx (SRWconst [8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx w0:(SRWconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx (SRWconst [j+8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w0 mem)
(MOVHstoreidx [i] {s} p idx w x:(MOVHstoreidx [i-2] {s} p idx (SRDconst [16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w mem)
(MOVHstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVHstoreidx [i-2] {s} p idx (SRDconst [j+16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w0 mem)
(MOVHstoreidx [i] {s} p idx w x:(MOVHstoreidx [i-2] {s} p idx (SRWconst [16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w mem)
(MOVHstoreidx [i] {s} p idx w0:(SRWconst [j] w) x:(MOVHstoreidx [i-2] {s} p idx (SRWconst [j+16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w0 mem)
(MOVWstoreidx [i] {s} p idx w x:(MOVWstoreidx [i-4] {s} p idx (SRDconst [32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstoreidx [i-4] {s} p idx w mem)
(MOVWstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVWstoreidx [i-4] {s} p idx (SRDconst [j+32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstoreidx [i-4] {s} p idx w0 mem)

// Combine stores into larger (unaligned) stores with the bytes reversed (little endian).
// Store-with-bytes-reversed instructions do not support relative memory addresses,
// so these stores can't operate on global data (SB).
(MOVBstore [i] {s} p (SRDconst [8] w) x:(MOVBstore [i-1] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p (SRDconst [j] w) x:(MOVBstore [i-1] {s} p w0:(SRDconst [j-8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w0 mem)
(MOVBstore [i] {s} p (SRWconst [8] w) x:(MOVBstore [i-1] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p (SRWconst [j] w) x:(MOVBstore [i-1] {s} p w0:(SRWconst [j-8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w0 mem)
(MOVHBRstore [i] {s} p (SRDconst [16] w) x:(MOVHBRstore [i-2] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w mem)
(MOVHBRstore [i] {s} p (SRDconst [j] w) x:(MOVHBRstore [i-2] {s} p w0:(SRDconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w0 mem)
(MOVHBRstore [i] {s} p (SRWconst [16] w) x:(MOVHBRstore [i-2] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w mem)
(MOVHBRstore [i] {s} p (SRWconst [j] w) x:(MOVHBRstore [i-2] {s} p w0:(SRWconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w0 mem)
(MOVWBRstore [i] {s} p (SRDconst [32] w) x:(MOVWBRstore [i-4] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstore [i-4] {s} p w mem)
(MOVWBRstore [i] {s} p (SRDconst [j] w) x:(MOVWBRstore [i-4] {s} p w0:(SRDconst [j-32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstore [i-4] {s} p w0 mem)

(MOVBstoreidx [i] {s} p idx (SRDconst [8] w) x:(MOVBstoreidx [i-1] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx w0:(SRDconst [j-8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w0 mem)
(MOVBstoreidx [i] {s} p idx (SRWconst [8] w) x:(MOVBstoreidx [i-1] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx (SRWconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx w0:(SRWconst [j-8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w0 mem)
(MOVHBRstoreidx [i] {s} p idx (SRDconst [16] w) x:(MOVHBRstoreidx [i-2] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w mem)
(MOVHBRstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVHBRstoreidx [i-2] {s} p idx w0:(SRDconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w0 mem)
(MOVHBRstoreidx [i] {s} p idx (SRWconst [16] w) x:(MOVHBRstoreidx [i-2] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w mem)
(MOVHBRstoreidx [i] {s} p idx (SRWconst [j] w) x:(MOVHBRstoreidx [i-2] {s} p idx w0:(SRWconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w0 mem)
(MOVWBRstoreidx [i] {s} p idx (SRDconst [32] w) x:(MOVWBRstoreidx [i-4] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstoreidx [i-4] {s} p idx w mem)
(MOVWBRstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVWBRstoreidx [i-4] {s} p idx w0:(SRDconst [j-32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstoreidx [i-4] {s} p idx w0 mem)

// Combining byte loads into larger (unaligned) loads.

// Big-endian loads

(ORW                 x1:(MOVBZload [i1] {s} p mem)
    sh:(SLWconst [8] x0:(MOVBZload [i0] {s} p mem)))
  && i1 == i0+1
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZload [i0] {s} p mem)

(OR                  x1:(MOVBZload [i1] {s} p mem)
    sh:(SLDconst [8] x0:(MOVBZload [i0] {s} p mem)))
  && i1 == i0+1
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZload [i0] {s} p mem)

(ORW                  x1:(MOVHZload [i1] {s} p mem)
    sh:(SLWconst [16] x0:(MOVHZload [i0] {s} p mem)))
  && i1 == i0+2
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZload [i0] {s} p mem)

(OR                   x1:(MOVHZload [i1] {s} p mem)
    sh:(SLDconst [16] x0:(MOVHZload [i0] {s} p mem)))
  && i1 == i0+2
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZload [i0] {s} p mem)

(OR                   x1:(MOVWZload [i1] {s} p mem)
    sh:(SLDconst [32] x0:(MOVWZload [i0] {s} p mem)))
  && i1 == i0+4
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVDload [i0] {s} p mem)

(ORW
    s0:(SLWconst [j0] x0:(MOVBZload [i0] {s} p mem))
    or:(ORW
        s1:(SLWconst [j1] x1:(MOVBZload [i1] {s} p mem))
	y))
  && i1 == i0+1
  && j1 == j0-8
  && j1 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (ORW <v.Type> (SLWconst <v.Type> [j1] (MOVHZload [i0] {s} p mem)) y)

(OR
    s0:(SLDconst [j0] x0:(MOVBZload [i0] {s} p mem))
    or:(OR
        s1:(SLDconst [j1] x1:(MOVBZload [i1] {s} p mem))
	y))
  && i1 == i0+1
  && j1 == j0-8
  && j1 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j1] (MOVHZload [i0] {s} p mem)) y)

(OR
    s0:(SLDconst [j0] x0:(MOVHZload [i0] {s} p mem))
    or:(OR
        s1:(SLDconst [j1] x1:(MOVHZload [i1] {s} p mem))
	y))
  && i1 == i0+2
  && j1 == j0-16
  && j1 % 32 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j1] (MOVWZload [i0] {s} p mem)) y)

// Big-endian indexed loads

(ORW                 x1:(MOVBZloadidx [i1] {s} p idx mem)
    sh:(SLWconst [8] x0:(MOVBZloadidx [i0] {s} p idx mem)))
  && i1 == i0+1
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZloadidx [i0] {s} p idx mem)

(OR                  x1:(MOVBZloadidx [i1] {s} p idx mem)
    sh:(SLDconst [8] x0:(MOVBZloadidx [i0] {s} p idx mem)))
  && i1 == i0+1
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZloadidx [i0] {s} p idx mem)

(ORW                  x1:(MOVHZloadidx [i1] {s} p idx mem)
    sh:(SLWconst [16] x0:(MOVHZloadidx [i0] {s} p idx mem)))
  && i1 == i0+2
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZloadidx [i0] {s} p idx mem)

(OR                   x1:(MOVHZloadidx [i1] {s} p idx mem)
    sh:(SLDconst [16] x0:(MOVHZloadidx [i0] {s} p idx mem)))
  && i1 == i0+2
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZloadidx [i0] {s} p idx mem)

(OR                   x1:(MOVWZloadidx [i1] {s} p idx mem)
    sh:(SLDconst [32] x0:(MOVWZloadidx [i0] {s} p idx mem)))
  && i1 == i0+4
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVDloadidx [i0] {s} p idx mem)

(ORW
    s0:(SLWconst [j0] x0:(MOVBZloadidx [i0] {s} p idx mem))
    or:(ORW
        s1:(SLWconst [j1] x1:(MOVBZloadidx [i1] {s} p idx mem))
	y))
  && i1 == i0+1
  && j1 == j0-8
  && j1 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (ORW <v.Type> (SLWconst <v.Type> [j1] (MOVHZloadidx [i0] {s} p idx mem)) y)

(OR
    s0:(SLDconst [j0] x0:(MOVBZloadidx [i0] {s} p idx mem))
    or:(OR
        s1:(SLDconst [j1] x1:(MOVBZloadidx [i1] {s} p idx mem))
	y))
  && i1 == i0+1
  && j1 == j0-8
  && j1 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j1] (MOVHZloadidx [i0] {s} p idx mem)) y)

(OR
    s0:(SLDconst [j0] x0:(MOVHZloadidx [i0] {s} p idx mem))
    or:(OR
        s1:(SLDconst [j1] x1:(MOVHZloadidx [i1] {s} p idx mem))
	y))
  && i1 == i0+2
  && j1 == j0-16
  && j1 % 32 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j1] (MOVWZloadidx [i0] {s} p idx mem)) y)

// Little-endian loads

(ORW                 x0:(MOVBZload [i0] {s} p mem)
    sh:(SLWconst [8] x1:(MOVBZload [i1] {s} p mem)))
  && p.Op != OpSB
  && i1 == i0+1
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRload [i0] {s} p mem))

(OR                  x0:(MOVBZload [i0] {s} p mem)
    sh:(SLDconst [8] x1:(MOVBZload [i1] {s} p mem)))
  && p.Op != OpSB
  && i1 == i0+1
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRload [i0] {s} p mem))

(ORW                  r0:(MOVHZreg x0:(MOVHBRload [i0] {s} p mem))
    sh:(SLWconst [16] r1:(MOVHZreg x1:(MOVHBRload [i1] {s} p mem))))
  && i1 == i0+2
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWBRload [i0] {s} p mem)

(OR                   r0:(MOVHZreg x0:(MOVHBRload [i0] {s} p mem))
    sh:(SLDconst [16] r1:(MOVHZreg x1:(MOVHBRload [i1] {s} p mem))))
  && i1 == i0+2
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZreg (MOVWBRload [i0] {s} p mem))

(OR                   r0:(MOVWZreg x0:(MOVWBRload [i0] {s} p mem))
    sh:(SLDconst [32] r1:(MOVWZreg x1:(MOVWBRload [i1] {s} p mem))))
  && i1 == i0+4
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVDBRload [i0] {s} p mem)

(ORW
    s1:(SLWconst [j1] x1:(MOVBZload [i1] {s} p mem))
    or:(ORW
        s0:(SLWconst [j0] x0:(MOVBZload [i0] {s} p mem))
	y))
  && p.Op != OpSB
  && i1 == i0+1
  && j1 == j0+8
  && j0 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (ORW <v.Type> (SLWconst <v.Type> [j0] (MOVHZreg (MOVHBRload [i0] {s} p mem))) y)

(OR
    s1:(SLDconst [j1] x1:(MOVBZload [i1] {s} p mem))
    or:(OR
        s0:(SLDconst [j0] x0:(MOVBZload [i0] {s} p mem))
	y))
  && p.Op != OpSB
  && i1 == i0+1
  && j1 == j0+8
  && j0 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j0] (MOVHZreg (MOVHBRload [i0] {s} p mem))) y)

(OR
    s1:(SLDconst [j1] r1:(MOVHZreg x1:(MOVHBRload [i1] {s} p mem)))
    or:(OR
        s0:(SLDconst [j0] r0:(MOVHZreg x0:(MOVHBRload [i0] {s} p mem)))
	y))
  && i1 == i0+2
  && j1 == j0+16
  && j0 % 32 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j0] (MOVWZreg (MOVWBRload [i0] {s} p mem))) y)

// Little-endian indexed loads

(ORW                 x0:(MOVBZloadidx [i0] {s} p idx mem)
    sh:(SLWconst [8] x1:(MOVBZloadidx [i1] {s} p idx mem)))
  && p.Op != OpSB
  && i1 == i0+1
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRloadidx [i0] {s} p idx mem))

(OR                  x0:(MOVBZloadidx [i0] {s} p idx mem)
    sh:(SLDconst [8] x1:(MOVBZloadidx [i1] {s} p idx mem)))
  && p.Op != OpSB
  && i1 == i0+1
  && x0.Uses == 1
  && x1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRloadidx [i0] {s} p idx mem))

(ORW                  r0:(MOVHZreg x0:(MOVHBRloadidx [i0] {s} p idx mem))
    sh:(SLWconst [16] r1:(MOVHZreg x1:(MOVHBRloadidx [i1] {s} p idx mem))))
  && i1 == i0+2
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWBRloadidx [i0] {s} p idx mem)

(OR                   r0:(MOVHZreg x0:(MOVHBRloadidx [i0] {s} p idx mem))
    sh:(SLDconst [16] r1:(MOVHZreg x1:(MOVHBRloadidx [i1] {s} p idx mem))))
  && i1 == i0+2
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVWZreg (MOVWBRloadidx [i0] {s} p idx mem))

(OR                   r0:(MOVWZreg x0:(MOVWBRloadidx [i0] {s} p idx mem))
    sh:(SLDconst [32] r1:(MOVWZreg x1:(MOVWBRloadidx [i1] {s} p idx mem))))
  && i1 == i0+4
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && sh.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(sh)
  -> @mergePoint(b,x0,x1) (MOVDBRloadidx [i0] {s} p idx mem)

(ORW
    s1:(SLWconst [j1] x1:(MOVBZloadidx [i1] {s} p idx mem))
    or:(ORW
        s0:(SLWconst [j0] x0:(MOVBZloadidx [i0] {s} p idx mem))
	y))
  && p.Op != OpSB
  && i1 == i0+1
  && j1 == j0+8
  && j0 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (ORW <v.Type> (SLWconst <v.Type> [j0] (MOVHZreg (MOVHBRloadidx [i0] {s} p idx mem))) y)

(OR
    s1:(SLDconst [j1] x1:(MOVBZloadidx [i1] {s} p idx mem))
    or:(OR
        s0:(SLDconst [j0] x0:(MOVBZloadidx [i0] {s} p idx mem))
	y))
  && p.Op != OpSB
  && i1 == i0+1
  && j1 == j0+8
  && j0 % 16 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j0] (MOVHZreg (MOVHBRloadidx [i0] {s} p idx mem))) y)

(OR
    s1:(SLDconst [j1] r1:(MOVHZreg x1:(MOVHBRloadidx [i1] {s} p idx mem)))
    or:(OR
        s0:(SLDconst [j0] r0:(MOVHZreg x0:(MOVHBRloadidx [i0] {s} p idx mem)))
	y))
  && i1 == i0+2
  && j1 == j0+16
  && j0 % 32 == 0
  && x0.Uses == 1
  && x1.Uses == 1
  && r0.Uses == 1
  && r1.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && or.Uses == 1
  && mergePoint(b,x0,x1,y) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(r0)
  && clobber(r1)
  && clobber(s0)
  && clobber(s1)
  && clobber(or)
  -> @mergePoint(b,x0,x1,y) (OR <v.Type> (SLDconst <v.Type> [j0] (MOVWZreg (MOVWBRloadidx [i0] {s} p idx mem))) y)

// Combine stores into store multiples.
// 32-bit
(MOVWstore [i] {s} p w1 x:(MOVWstore [i-4] {s} p w0 mem))
  && p.Op != OpSB
  && x.Uses == 1
  && is20Bit(i-4)
  && clobber(x)
  -> (STM2 [i-4] {s} p w0 w1 mem)
(MOVWstore [i] {s} p w2 x:(STM2 [i-8] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STM3 [i-8] {s} p w0 w1 w2 mem)
(MOVWstore [i] {s} p w3 x:(STM3 [i-12] {s} p w0 w1 w2 mem))
  && x.Uses == 1
  && is20Bit(i-12)
  && clobber(x)
  -> (STM4 [i-12] {s} p w0 w1 w2 w3 mem)
(STM2 [i] {s} p w2 w3 x:(STM2 [i-8] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STM4 [i-8] {s} p w0 w1 w2 w3 mem)
// 64-bit
(MOVDstore [i] {s} p w1 x:(MOVDstore [i-8] {s} p w0 mem))
  && p.Op != OpSB
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STMG2 [i-8] {s} p w0 w1 mem)
(MOVDstore [i] {s} p w2 x:(STMG2 [i-16] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-16)
  && clobber(x)
  -> (STMG3 [i-16] {s} p w0 w1 w2 mem)
(MOVDstore [i] {s} p w3 x:(STMG3 [i-24] {s} p w0 w1 w2 mem))
  && x.Uses == 1
  && is20Bit(i-24)
  && clobber(x)
  -> (STMG4 [i-24] {s} p w0 w1 w2 w3 mem)
(STMG2 [i] {s} p w2 w3 x:(STMG2 [i-16] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-16)
  && clobber(x)
  -> (STMG4 [i-16] {s} p w0 w1 w2 w3 mem)

// Convert 32-bit store multiples into 64-bit stores.
(STM2 [i] {s} p (SRDconst [32] x) x mem) -> (MOVDstore [i] {s} p x mem)