| // 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. | |
| // Optimizations TODO: | |
| // * Use SLTI and SLTIU for comparisons to constants, instead of SLT/SLTU with constants in registers | |
| // * Use the zero register instead of moving 0 into a register. | |
| // * Add rules to avoid generating a temp bool value for (If (SLT[U] ...) ...). | |
| // * Optimize left and right shift by simplifying SLTIU, Neg, and ADD for constants. | |
| // * Arrange for non-trivial Zero and Move lowerings to use aligned loads and stores. | |
| // * Eliminate zero immediate shifts, adds, etc. | |
| // * Use a Duff's device for some moves and zeros. | |
| // * Avoid using Neq32 for writeBarrier.enabled checks. | |
| // Lowering arithmetic | |
| (Add64 ...) => (ADD ...) | |
| (AddPtr ...) => (ADD ...) | |
| (Add32 ...) => (ADD ...) | |
| (Add16 ...) => (ADD ...) | |
| (Add8 ...) => (ADD ...) | |
| (Add32F ...) => (FADDS ...) | |
| (Add64F ...) => (FADDD ...) | |
| (Sub64 ...) => (SUB ...) | |
| (SubPtr ...) => (SUB ...) | |
| (Sub32 ...) => (SUB ...) | |
| (Sub16 ...) => (SUB ...) | |
| (Sub8 ...) => (SUB ...) | |
| (Sub32F ...) => (FSUBS ...) | |
| (Sub64F ...) => (FSUBD ...) | |
| (Mul64 ...) => (MUL ...) | |
| (Mul32 ...) => (MULW ...) | |
| (Mul16 x y) => (MULW (SignExt16to32 x) (SignExt16to32 y)) | |
| (Mul8 x y) => (MULW (SignExt8to32 x) (SignExt8to32 y)) | |
| (Mul32F ...) => (FMULS ...) | |
| (Mul64F ...) => (FMULD ...) | |
| (Div32F ...) => (FDIVS ...) | |
| (Div64F ...) => (FDIVD ...) | |
| (Div64 x y [false]) => (DIV x y) | |
| (Div64u ...) => (DIVU ...) | |
| (Div32 x y [false]) => (DIVW x y) | |
| (Div32u ...) => (DIVUW ...) | |
| (Div16 x y [false]) => (DIVW (SignExt16to32 x) (SignExt16to32 y)) | |
| (Div16u x y) => (DIVUW (ZeroExt16to32 x) (ZeroExt16to32 y)) | |
| (Div8 x y) => (DIVW (SignExt8to32 x) (SignExt8to32 y)) | |
| (Div8u x y) => (DIVUW (ZeroExt8to32 x) (ZeroExt8to32 y)) | |
| (Hmul64 ...) => (MULH ...) | |
| (Hmul64u ...) => (MULHU ...) | |
| (Hmul32 x y) => (SRAI [32] (MUL (SignExt32to64 x) (SignExt32to64 y))) | |
| (Hmul32u x y) => (SRLI [32] (MUL (ZeroExt32to64 x) (ZeroExt32to64 y))) | |
| // (x + y) / 2 => (x / 2) + (y / 2) + (x & y & 1) | |
| (Avg64u <t> x y) => (ADD (ADD <t> (SRLI <t> [1] x) (SRLI <t> [1] y)) (ANDI <t> [1] (AND <t> x y))) | |
| (Mod64 x y [false]) => (REM x y) | |
| (Mod64u ...) => (REMU ...) | |
| (Mod32 x y [false]) => (REMW x y) | |
| (Mod32u ...) => (REMUW ...) | |
| (Mod16 x y [false]) => (REMW (SignExt16to32 x) (SignExt16to32 y)) | |
| (Mod16u x y) => (REMUW (ZeroExt16to32 x) (ZeroExt16to32 y)) | |
| (Mod8 x y) => (REMW (SignExt8to32 x) (SignExt8to32 y)) | |
| (Mod8u x y) => (REMUW (ZeroExt8to32 x) (ZeroExt8to32 y)) | |
| (And64 ...) => (AND ...) | |
| (And32 ...) => (AND ...) | |
| (And16 ...) => (AND ...) | |
| (And8 ...) => (AND ...) | |
| (Or64 ...) => (OR ...) | |
| (Or32 ...) => (OR ...) | |
| (Or16 ...) => (OR ...) | |
| (Or8 ...) => (OR ...) | |
| (Xor64 ...) => (XOR ...) | |
| (Xor32 ...) => (XOR ...) | |
| (Xor16 ...) => (XOR ...) | |
| (Xor8 ...) => (XOR ...) | |
| (Neg64 ...) => (NEG ...) | |
| (Neg32 ...) => (NEG ...) | |
| (Neg16 ...) => (NEG ...) | |
| (Neg8 ...) => (NEG ...) | |
| (Neg32F ...) => (FNEGS ...) | |
| (Neg64F ...) => (FNEGD ...) | |
| (Com64 ...) => (NOT ...) | |
| (Com32 ...) => (NOT ...) | |
| (Com16 ...) => (NOT ...) | |
| (Com8 ...) => (NOT ...) | |
| (Sqrt ...) => (FSQRTD ...) | |
| // Sign and zero extension. | |
| (SignExt8to16 ...) => (MOVBreg ...) | |
| (SignExt8to32 ...) => (MOVBreg ...) | |
| (SignExt8to64 ...) => (MOVBreg ...) | |
| (SignExt16to32 ...) => (MOVHreg ...) | |
| (SignExt16to64 ...) => (MOVHreg ...) | |
| (SignExt32to64 ...) => (MOVWreg ...) | |
| (ZeroExt8to16 ...) => (MOVBUreg ...) | |
| (ZeroExt8to32 ...) => (MOVBUreg ...) | |
| (ZeroExt8to64 ...) => (MOVBUreg ...) | |
| (ZeroExt16to32 ...) => (MOVHUreg ...) | |
| (ZeroExt16to64 ...) => (MOVHUreg ...) | |
| (ZeroExt32to64 ...) => (MOVWUreg ...) | |
| (Cvt32to32F ...) => (FCVTSW ...) | |
| (Cvt32to64F ...) => (FCVTDW ...) | |
| (Cvt64to32F ...) => (FCVTSL ...) | |
| (Cvt64to64F ...) => (FCVTDL ...) | |
| (Cvt32Fto32 ...) => (FCVTWS ...) | |
| (Cvt32Fto64 ...) => (FCVTLS ...) | |
| (Cvt64Fto32 ...) => (FCVTWD ...) | |
| (Cvt64Fto64 ...) => (FCVTLD ...) | |
| (Cvt32Fto64F ...) => (FCVTDS ...) | |
| (Cvt64Fto32F ...) => (FCVTSD ...) | |
| (CvtBoolToUint8 ...) => (Copy ...) | |
| (Round32F ...) => (Copy ...) | |
| (Round64F ...) => (Copy ...) | |
| // From genericOps.go: | |
| // "0 if arg0 == 0, -1 if arg0 > 0, undef if arg0<0" | |
| // | |
| // Like other arches, we compute ~((x-1) >> 63), with arithmetic right shift. | |
| // For positive x, bit 63 of x-1 is always 0, so the result is -1. | |
| // For zero x, bit 63 of x-1 is 1, so the result is 0. | |
| // | |
| (Slicemask <t> x) => (NOT (SRAI <t> [63] (ADDI <t> [-1] x))) | |
| // Truncations | |
| // We ignore the unused high parts of registers, so truncates are just copies. | |
| (Trunc16to8 ...) => (Copy ...) | |
| (Trunc32to8 ...) => (Copy ...) | |
| (Trunc32to16 ...) => (Copy ...) | |
| (Trunc64to8 ...) => (Copy ...) | |
| (Trunc64to16 ...) => (Copy ...) | |
| (Trunc64to32 ...) => (Copy ...) | |
| // Shifts | |
| // SLL only considers the bottom 6 bits of y. If y > 64, the result should | |
| // always be 0. | |
| // | |
| // Breaking down the operation: | |
| // | |
| // (SLL x y) generates x << (y & 63). | |
| // | |
| // If y < 64, this is the value we want. Otherwise, we want zero. | |
| // | |
| // So, we AND with -1 * uint64(y < 64), which is 0xfffff... if y < 64 and 0 otherwise. | |
| (Lsh8x8 <t> x y) => (AND (SLL <t> x y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Lsh8x16 <t> x y) => (AND (SLL <t> x y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Lsh8x32 <t> x y) => (AND (SLL <t> x y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Lsh8x64 <t> x y) => (AND (SLL <t> x y) (Neg8 <t> (SLTIU <t> [64] y))) | |
| (Lsh16x8 <t> x y) => (AND (SLL <t> x y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Lsh16x16 <t> x y) => (AND (SLL <t> x y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Lsh16x32 <t> x y) => (AND (SLL <t> x y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Lsh16x64 <t> x y) => (AND (SLL <t> x y) (Neg16 <t> (SLTIU <t> [64] y))) | |
| (Lsh32x8 <t> x y) => (AND (SLL <t> x y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Lsh32x16 <t> x y) => (AND (SLL <t> x y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Lsh32x32 <t> x y) => (AND (SLL <t> x y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Lsh32x64 <t> x y) => (AND (SLL <t> x y) (Neg32 <t> (SLTIU <t> [64] y))) | |
| (Lsh64x8 <t> x y) => (AND (SLL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Lsh64x16 <t> x y) => (AND (SLL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Lsh64x32 <t> x y) => (AND (SLL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Lsh64x64 <t> x y) => (AND (SLL <t> x y) (Neg64 <t> (SLTIU <t> [64] y))) | |
| // SRL only considers the bottom 6 bits of y. If y > 64, the result should | |
| // always be 0. See Lsh above for a detailed description. | |
| (Rsh8Ux8 <t> x y) => (AND (SRL <t> (ZeroExt8to64 x) y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Rsh8Ux16 <t> x y) => (AND (SRL <t> (ZeroExt8to64 x) y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Rsh8Ux32 <t> x y) => (AND (SRL <t> (ZeroExt8to64 x) y) (Neg8 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Rsh8Ux64 <t> x y) => (AND (SRL <t> (ZeroExt8to64 x) y) (Neg8 <t> (SLTIU <t> [64] y))) | |
| (Rsh16Ux8 <t> x y) => (AND (SRL <t> (ZeroExt16to64 x) y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Rsh16Ux16 <t> x y) => (AND (SRL <t> (ZeroExt16to64 x) y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Rsh16Ux32 <t> x y) => (AND (SRL <t> (ZeroExt16to64 x) y) (Neg16 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Rsh16Ux64 <t> x y) => (AND (SRL <t> (ZeroExt16to64 x) y) (Neg16 <t> (SLTIU <t> [64] y))) | |
| (Rsh32Ux8 <t> x y) => (AND (SRL <t> (ZeroExt32to64 x) y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Rsh32Ux16 <t> x y) => (AND (SRL <t> (ZeroExt32to64 x) y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Rsh32Ux32 <t> x y) => (AND (SRL <t> (ZeroExt32to64 x) y) (Neg32 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Rsh32Ux64 <t> x y) => (AND (SRL <t> (ZeroExt32to64 x) y) (Neg32 <t> (SLTIU <t> [64] y))) | |
| (Rsh64Ux8 <t> x y) => (AND (SRL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt8to64 y)))) | |
| (Rsh64Ux16 <t> x y) => (AND (SRL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt16to64 y)))) | |
| (Rsh64Ux32 <t> x y) => (AND (SRL <t> x y) (Neg64 <t> (SLTIU <t> [64] (ZeroExt32to64 y)))) | |
| (Rsh64Ux64 <t> x y) => (AND (SRL <t> x y) (Neg64 <t> (SLTIU <t> [64] y))) | |
| // SRA only considers the bottom 6 bits of y. If y > 64, the result should | |
| // be either 0 or -1 based on the sign bit. | |
| // | |
| // We implement this by performing the max shift (-1) if y >= 64. | |
| // | |
| // We OR (uint64(y < 64) - 1) into y before passing it to SRA. This leaves | |
| // us with -1 (0xffff...) if y >= 64. | |
| // | |
| // We don't need to sign-extend the OR result, as it will be at minimum 8 bits, | |
| // more than the 6 bits SRA cares about. | |
| (Rsh8x8 <t> x y) => (SRA <t> (SignExt8to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt8to64 y))))) | |
| (Rsh8x16 <t> x y) => (SRA <t> (SignExt8to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt16to64 y))))) | |
| (Rsh8x32 <t> x y) => (SRA <t> (SignExt8to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt32to64 y))))) | |
| (Rsh8x64 <t> x y) => (SRA <t> (SignExt8to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] y)))) | |
| (Rsh16x8 <t> x y) => (SRA <t> (SignExt16to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt8to64 y))))) | |
| (Rsh16x16 <t> x y) => (SRA <t> (SignExt16to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt16to64 y))))) | |
| (Rsh16x32 <t> x y) => (SRA <t> (SignExt16to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt32to64 y))))) | |
| (Rsh16x64 <t> x y) => (SRA <t> (SignExt16to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] y)))) | |
| (Rsh32x8 <t> x y) => (SRA <t> (SignExt32to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt8to64 y))))) | |
| (Rsh32x16 <t> x y) => (SRA <t> (SignExt32to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt16to64 y))))) | |
| (Rsh32x32 <t> x y) => (SRA <t> (SignExt32to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt32to64 y))))) | |
| (Rsh32x64 <t> x y) => (SRA <t> (SignExt32to64 x) (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] y)))) | |
| (Rsh64x8 <t> x y) => (SRA <t> x (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt8to64 y))))) | |
| (Rsh64x16 <t> x y) => (SRA <t> x (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt16to64 y))))) | |
| (Rsh64x32 <t> x y) => (SRA <t> x (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] (ZeroExt32to64 y))))) | |
| (Rsh64x64 <t> x y) => (SRA <t> x (OR <y.Type> y (ADDI <y.Type> [-1] (SLTIU <y.Type> [64] y)))) | |
| // rotates | |
| (RotateLeft8 <t> x (MOVBconst [c])) => (Or8 (Lsh8x64 <t> x (MOVBconst [c&7])) (Rsh8Ux64 <t> x (MOVBconst [-c&7]))) | |
| (RotateLeft16 <t> x (MOVHconst [c])) => (Or16 (Lsh16x64 <t> x (MOVHconst [c&15])) (Rsh16Ux64 <t> x (MOVHconst [-c&15]))) | |
| (RotateLeft32 <t> x (MOVWconst [c])) => (Or32 (Lsh32x64 <t> x (MOVWconst [c&31])) (Rsh32Ux64 <t> x (MOVWconst [-c&31]))) | |
| (RotateLeft64 <t> x (MOVDconst [c])) => (Or64 (Lsh64x64 <t> x (MOVDconst [c&63])) (Rsh64Ux64 <t> x (MOVDconst [-c&63]))) | |
| (Less64 ...) => (SLT ...) | |
| (Less32 x y) => (SLT (SignExt32to64 x) (SignExt32to64 y)) | |
| (Less16 x y) => (SLT (SignExt16to64 x) (SignExt16to64 y)) | |
| (Less8 x y) => (SLT (SignExt8to64 x) (SignExt8to64 y)) | |
| (Less64U ...) => (SLTU ...) | |
| (Less32U x y) => (SLTU (ZeroExt32to64 x) (ZeroExt32to64 y)) | |
| (Less16U x y) => (SLTU (ZeroExt16to64 x) (ZeroExt16to64 y)) | |
| (Less8U x y) => (SLTU (ZeroExt8to64 x) (ZeroExt8to64 y)) | |
| (Less64F ...) => (FLTD ...) | |
| (Less32F ...) => (FLTS ...) | |
| // Convert x <= y to !(y > x). | |
| (Leq64 x y) => (Not (Less64 y x)) | |
| (Leq32 x y) => (Not (Less32 y x)) | |
| (Leq16 x y) => (Not (Less16 y x)) | |
| (Leq8 x y) => (Not (Less8 y x)) | |
| (Leq64U x y) => (Not (Less64U y x)) | |
| (Leq32U x y) => (Not (Less32U y x)) | |
| (Leq16U x y) => (Not (Less16U y x)) | |
| (Leq8U x y) => (Not (Less8U y x)) | |
| (Leq64F ...) => (FLED ...) | |
| (Leq32F ...) => (FLES ...) | |
| (EqPtr x y) => (SEQZ (SUB <x.Type> x y)) | |
| (Eq64 x y) => (SEQZ (SUB <x.Type> x y)) | |
| (Eq32 x y) => (SEQZ (SUBW <x.Type> x y)) | |
| (Eq16 x y) => (SEQZ (SUB <x.Type> (ZeroExt16to64 x) (ZeroExt16to64 y))) | |
| (Eq8 x y) => (SEQZ (SUB <x.Type> (ZeroExt8to64 x) (ZeroExt8to64 y))) | |
| (Eq64F ...) => (FEQD ...) | |
| (Eq32F ...) => (FEQS ...) | |
| (NeqPtr x y) => (SNEZ (SUB <x.Type> x y)) | |
| (Neq64 x y) => (SNEZ (SUB <x.Type> x y)) | |
| (Neq32 x y) => (SNEZ (SUBW <x.Type> x y)) | |
| (Neq16 x y) => (SNEZ (SUB <x.Type> (ZeroExt16to64 x) (ZeroExt16to64 y))) | |
| (Neq8 x y) => (SNEZ (SUB <x.Type> (ZeroExt8to64 x) (ZeroExt8to64 y))) | |
| (Neq64F ...) => (FNED ...) | |
| (Neq32F ...) => (FNES ...) | |
| // Loads | |
| (Load <t> ptr mem) && t.IsBoolean() => (MOVBUload ptr mem) | |
| (Load <t> ptr mem) && ( is8BitInt(t) && isSigned(t)) => (MOVBload ptr mem) | |
| (Load <t> ptr mem) && ( is8BitInt(t) && !isSigned(t)) => (MOVBUload ptr mem) | |
| (Load <t> ptr mem) && (is16BitInt(t) && isSigned(t)) => (MOVHload ptr mem) | |
| (Load <t> ptr mem) && (is16BitInt(t) && !isSigned(t)) => (MOVHUload ptr mem) | |
| (Load <t> ptr mem) && (is32BitInt(t) && isSigned(t)) => (MOVWload ptr mem) | |
| (Load <t> ptr mem) && (is32BitInt(t) && !isSigned(t)) => (MOVWUload ptr mem) | |
| (Load <t> ptr mem) && (is64BitInt(t) || isPtr(t)) => (MOVDload ptr mem) | |
| (Load <t> ptr mem) && is32BitFloat(t) => (FMOVWload ptr mem) | |
| (Load <t> ptr mem) && is64BitFloat(t) => (FMOVDload ptr mem) | |
| // Stores | |
| (Store {t} ptr val mem) && t.Size() == 1 => (MOVBstore ptr val mem) | |
| (Store {t} ptr val mem) && t.Size() == 2 => (MOVHstore ptr val mem) | |
| (Store {t} ptr val mem) && t.Size() == 4 && !is32BitFloat(val.Type) => (MOVWstore ptr val mem) | |
| (Store {t} ptr val mem) && t.Size() == 8 && !is64BitFloat(val.Type) => (MOVDstore ptr val mem) | |
| (Store {t} ptr val mem) && t.Size() == 4 && is32BitFloat(val.Type) => (FMOVWstore ptr val mem) | |
| (Store {t} ptr val mem) && t.Size() == 8 && is64BitFloat(val.Type) => (FMOVDstore ptr val mem) | |
| // We need to fold MOVaddr into the LD/MOVDstore ops so that the live variable analysis | |
| // knows what variables are being read/written by the ops. | |
| (MOVBUload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVBUload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVBload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVBload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVHUload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVHUload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVHload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVHload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVWUload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVWUload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVWload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVWload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVDload [off1] {sym1} (MOVaddr [off2] {sym2} base) mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVDload [off1+off2] {mergeSymTyped(sym1,sym2)} base mem) | |
| (MOVBstore [off1] {sym1} (MOVaddr [off2] {sym2} base) val mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVBstore [off1+off2] {mergeSymTyped(sym1,sym2)} base val mem) | |
| (MOVHstore [off1] {sym1} (MOVaddr [off2] {sym2} base) val mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVHstore [off1+off2] {mergeSymTyped(sym1,sym2)} base val mem) | |
| (MOVWstore [off1] {sym1} (MOVaddr [off2] {sym2} base) val mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVWstore [off1+off2] {mergeSymTyped(sym1,sym2)} base val mem) | |
| (MOVDstore [off1] {sym1} (MOVaddr [off2] {sym2} base) val mem) && is32Bit(int64(off1)+int64(off2)) && canMergeSym(sym1, sym2) => | |
| (MOVDstore [off1+off2] {mergeSymTyped(sym1,sym2)} base val mem) | |
| (MOVBstorezero [off1] {sym1} (MOVaddr [off2] {sym2} ptr) mem) && canMergeSym(sym1,sym2) && is32Bit(int64(off1)+int64(off2)) => | |
| (MOVBstorezero [off1+off2] {mergeSymTyped(sym1,sym2)} ptr mem) | |
| (MOVHstorezero [off1] {sym1} (MOVaddr [off2] {sym2} ptr) mem) && canMergeSym(sym1,sym2) && is32Bit(int64(off1)+int64(off2)) => | |
| (MOVHstorezero [off1+off2] {mergeSymTyped(sym1,sym2)} ptr mem) | |
| (MOVWstorezero [off1] {sym1} (MOVaddr [off2] {sym2} ptr) mem) && canMergeSym(sym1,sym2) && is32Bit(int64(off1)+int64(off2)) => | |
| (MOVWstorezero [off1+off2] {mergeSymTyped(sym1,sym2)} ptr mem) | |
| (MOVDstorezero [off1] {sym1} (MOVaddr [off2] {sym2} ptr) mem) && canMergeSym(sym1,sym2) && is32Bit(int64(off1)+int64(off2)) => | |
| (MOVDstorezero [off1+off2] {mergeSymTyped(sym1,sym2)} ptr mem) | |
| (MOVBUload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVBUload [off1+int32(off2)] {sym} base mem) | |
| (MOVBload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVBload [off1+int32(off2)] {sym} base mem) | |
| (MOVHUload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVHUload [off1+int32(off2)] {sym} base mem) | |
| (MOVHload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVHload [off1+int32(off2)] {sym} base mem) | |
| (MOVWUload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVWUload [off1+int32(off2)] {sym} base mem) | |
| (MOVWload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVWload [off1+int32(off2)] {sym} base mem) | |
| (MOVDload [off1] {sym} (ADDI [off2] base) mem) && is32Bit(int64(off1)+off2) => | |
| (MOVDload [off1+int32(off2)] {sym} base mem) | |
| (MOVBstore [off1] {sym} (ADDI [off2] base) val mem) && is32Bit(int64(off1)+off2) => | |
| (MOVBstore [off1+int32(off2)] {sym} base val mem) | |
| (MOVHstore [off1] {sym} (ADDI [off2] base) val mem) && is32Bit(int64(off1)+off2) => | |
| (MOVHstore [off1+int32(off2)] {sym} base val mem) | |
| (MOVWstore [off1] {sym} (ADDI [off2] base) val mem) && is32Bit(int64(off1)+off2) => | |
| (MOVWstore [off1+int32(off2)] {sym} base val mem) | |
| (MOVDstore [off1] {sym} (ADDI [off2] base) val mem) && is32Bit(int64(off1)+off2) => | |
| (MOVDstore [off1+int32(off2)] {sym} base val mem) | |
| (MOVBstorezero [off1] {sym} (ADDI [off2] ptr) mem) && is32Bit(int64(off1)+off2) => (MOVBstorezero [off1+int32(off2)] {sym} ptr mem) | |
| (MOVHstorezero [off1] {sym} (ADDI [off2] ptr) mem) && is32Bit(int64(off1)+off2) => (MOVHstorezero [off1+int32(off2)] {sym} ptr mem) | |
| (MOVWstorezero [off1] {sym} (ADDI [off2] ptr) mem) && is32Bit(int64(off1)+off2) => (MOVWstorezero [off1+int32(off2)] {sym} ptr mem) | |
| (MOVDstorezero [off1] {sym} (ADDI [off2] ptr) mem) && is32Bit(int64(off1)+off2) => (MOVDstorezero [off1+int32(off2)] {sym} ptr mem) | |
| // Similarly, fold ADDI into MOVaddr to avoid confusing live variable analysis | |
| // with OffPtr -> ADDI. | |
| (ADDI [c] (MOVaddr [d] {s} x)) && is32Bit(c+int64(d)) => (MOVaddr [int32(c)+d] {s} x) | |
| // Zeroing | |
| // TODO: more optimized zeroing, including attempting to use aligned accesses. | |
| (Zero [0] _ mem) => mem | |
| (Zero [1] ptr mem) => (MOVBstore ptr (MOVBconst) mem) | |
| (Zero [2] ptr mem) => (MOVHstore ptr (MOVHconst) mem) | |
| (Zero [4] ptr mem) => (MOVWstore ptr (MOVWconst) mem) | |
| (Zero [8] ptr mem) => (MOVDstore ptr (MOVDconst) mem) | |
| // Generic zeroing uses a loop | |
| (Zero [s] {t} ptr mem) => | |
| (LoweredZero [t.Alignment()] | |
| ptr | |
| (ADD <ptr.Type> ptr (MOVDconst [s-moveSize(t.Alignment(), config)])) | |
| mem) | |
| (Convert ...) => (MOVconvert ...) | |
| // Checks | |
| (IsNonNil p) => (NeqPtr (MOVDconst) p) | |
| (IsInBounds ...) => (Less64U ...) | |
| (IsSliceInBounds ...) => (Leq64U ...) | |
| // Trivial lowering | |
| (NilCheck ...) => (LoweredNilCheck ...) | |
| (GetClosurePtr ...) => (LoweredGetClosurePtr ...) | |
| (GetCallerSP ...) => (LoweredGetCallerSP ...) | |
| (GetCallerPC ...) => (LoweredGetCallerPC ...) | |
| // Write barrier. | |
| (WB ...) => (LoweredWB ...) | |
| (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) | |
| // Moves | |
| // TODO: more optimized moves, including attempting to use aligned accesses. | |
| (Move [0] _ _ mem) => mem | |
| (Move [1] dst src mem) => (MOVBstore dst (MOVBload src mem) mem) | |
| (Move [2] dst src mem) => (MOVHstore dst (MOVHload src mem) mem) | |
| (Move [4] dst src mem) => (MOVWstore dst (MOVWload src mem) mem) | |
| (Move [8] dst src mem) => (MOVDstore dst (MOVDload src mem) mem) | |
| // Generic move uses a loop | |
| (Move [s] {t} dst src mem) && (s <= 16 || logLargeCopy(v, s)) => | |
| (LoweredMove [t.Alignment()] | |
| dst | |
| src | |
| (ADDI <src.Type> [s-moveSize(t.Alignment(), config)] src) | |
| mem) | |
| // Boolean ops; 0=false, 1=true | |
| (AndB ...) => (AND ...) | |
| (OrB ...) => (OR ...) | |
| (EqB x y) => (SEQZ (XOR <typ.Bool> x y)) | |
| (NeqB ...) => (XOR ...) | |
| (Not ...) => (SEQZ ...) | |
| // Lowering pointer arithmetic | |
| // TODO: Special handling for SP offsets, like ARM | |
| (OffPtr [off] ptr:(SP)) && is32Bit(off) => (MOVaddr [int32(off)] ptr) | |
| (OffPtr [off] ptr) && is32Bit(off) => (ADDI [off] ptr) | |
| (OffPtr [off] ptr) => (ADD (MOVDconst [off]) ptr) | |
| (Const8 ...) => (MOVBconst ...) | |
| (Const16 ...) => (MOVHconst ...) | |
| (Const32 ...) => (MOVWconst ...) | |
| (Const64 ...) => (MOVDconst ...) | |
| (Const32F [val]) => (FMVSX (MOVWconst [int32(math.Float32bits(val))])) | |
| (Const64F [val]) => (FMVDX (MOVDconst [int64(math.Float64bits(val))])) | |
| (ConstNil) => (MOVDconst [0]) | |
| (ConstBool [val]) => (MOVBconst [int8(b2i(val))]) | |
| // Convert 64 bit immediate to two 32 bit immediates, combine with add and shift. | |
| // The lower 32 bit immediate will be treated as signed, | |
| // so if it is negative, adjust for the borrow by incrementing the top half. | |
| // We don't have to worry about overflow from the increment, | |
| // because if the top half is all 1s, and int32(c) is negative, | |
| // then the overall constant fits in an int32. | |
| (MOVDconst <t> [c]) && !is32Bit(c) && int32(c) < 0 => (ADD (SLLI <t> [32] (MOVDconst [c>>32+1])) (MOVDconst [int64(int32(c))])) | |
| (MOVDconst <t> [c]) && !is32Bit(c) && int32(c) >= 0 => (ADD (SLLI <t> [32] (MOVDconst [c>>32+0])) (MOVDconst [int64(int32(c))])) | |
| (Addr {sym} base) => (MOVaddr {sym} [0] base) | |
| (LocalAddr {sym} base _) => (MOVaddr {sym} base) | |
| // Calls | |
| (StaticCall ...) => (CALLstatic ...) | |
| (ClosureCall ...) => (CALLclosure ...) | |
| (InterCall ...) => (CALLinter ...) | |
| // Atomic Intrinsics | |
| (AtomicLoad8 ...) => (LoweredAtomicLoad8 ...) | |
| (AtomicLoad32 ...) => (LoweredAtomicLoad32 ...) | |
| (AtomicLoad64 ...) => (LoweredAtomicLoad64 ...) | |
| (AtomicLoadPtr ...) => (LoweredAtomicLoad64 ...) | |
| (AtomicStore8 ...) => (LoweredAtomicStore8 ...) | |
| (AtomicStore32 ...) => (LoweredAtomicStore32 ...) | |
| (AtomicStore64 ...) => (LoweredAtomicStore64 ...) | |
| (AtomicStorePtrNoWB ...) => (LoweredAtomicStore64 ...) | |
| (AtomicAdd32 ...) => (LoweredAtomicAdd32 ...) | |
| (AtomicAdd64 ...) => (LoweredAtomicAdd64 ...) | |
| (AtomicCompareAndSwap32 ...) => (LoweredAtomicCas32 ...) | |
| (AtomicCompareAndSwap64 ...) => (LoweredAtomicCas64 ...) | |
| (AtomicExchange32 ...) => (LoweredAtomicExchange32 ...) | |
| (AtomicExchange64 ...) => (LoweredAtomicExchange64 ...) | |
| // Conditional branches | |
| (If cond yes no) => (BNEZ cond yes no) | |
| // Optimizations | |
| // Absorb SEQZ/SNEZ into branch. | |
| (BEQZ (SEQZ x) yes no) => (BNEZ x yes no) | |
| (BEQZ (SNEZ x) yes no) => (BEQZ x yes no) | |
| (BNEZ (SEQZ x) yes no) => (BEQZ x yes no) | |
| (BNEZ (SNEZ x) yes no) => (BNEZ x yes no) | |
| // Convert BEQZ/BNEZ into more optimal branch conditions. | |
| (BEQZ (SUB x y) yes no) => (BEQ x y yes no) | |
| (BNEZ (SUB x y) yes no) => (BNE x y yes no) | |
| (BEQZ (SLT x y) yes no) => (BGE x y yes no) | |
| (BNEZ (SLT x y) yes no) => (BLT x y yes no) | |
| (BEQZ (SLTU x y) yes no) => (BGEU x y yes no) | |
| (BNEZ (SLTU x y) yes no) => (BLTU x y yes no) | |
| // Convert branch with zero to BEQZ/BNEZ. | |
| (BEQ (MOVDconst [0]) cond yes no) => (BEQZ cond yes no) | |
| (BEQ cond (MOVDconst [0]) yes no) => (BEQZ cond yes no) | |
| (BNE (MOVDconst [0]) cond yes no) => (BNEZ cond yes no) | |
| (BNE cond (MOVDconst [0]) yes no) => (BNEZ cond yes no) | |
| // Store zero | |
| (MOVBstore [off] {sym} ptr (MOVBconst [0]) mem) => (MOVBstorezero [off] {sym} ptr mem) | |
| (MOVHstore [off] {sym} ptr (MOVHconst [0]) mem) => (MOVHstorezero [off] {sym} ptr mem) | |
| (MOVWstore [off] {sym} ptr (MOVWconst [0]) mem) => (MOVWstorezero [off] {sym} ptr mem) | |
| (MOVDstore [off] {sym} ptr (MOVDconst [0]) mem) => (MOVDstorezero [off] {sym} ptr mem) | |
| // Avoid sign/zero extension after properly typed load. | |
| (MOVBreg x:(MOVBload _ _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVBload _ _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVBUload _ _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVHload _ _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVBload _ _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVBUload _ _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVHload _ _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVHUload _ _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVWload _ _)) => (MOVDreg x) | |
| (MOVBUreg x:(MOVBUload _ _)) => (MOVDreg x) | |
| (MOVHUreg x:(MOVBUload _ _)) => (MOVDreg x) | |
| (MOVHUreg x:(MOVHUload _ _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVBUload _ _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVHUload _ _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVWUload _ _)) => (MOVDreg x) | |
| // Fold double extensions. | |
| (MOVBreg x:(MOVBreg _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVBreg _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVBUreg _)) => (MOVDreg x) | |
| (MOVHreg x:(MOVHreg _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVBreg _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVBUreg _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVHreg _)) => (MOVDreg x) | |
| (MOVWreg x:(MOVWreg _)) => (MOVDreg x) | |
| (MOVBUreg x:(MOVBUreg _)) => (MOVDreg x) | |
| (MOVHUreg x:(MOVBUreg _)) => (MOVDreg x) | |
| (MOVHUreg x:(MOVHUreg _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVBUreg _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVHUreg _)) => (MOVDreg x) | |
| (MOVWUreg x:(MOVWUreg _)) => (MOVDreg x) | |
| // Do not extend before store. | |
| (MOVBstore [off] {sym} ptr (MOVBreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVBstore [off] {sym} ptr (MOVHreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVBstore [off] {sym} ptr (MOVWreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVBstore [off] {sym} ptr (MOVBUreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVBstore [off] {sym} ptr (MOVHUreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVBstore [off] {sym} ptr (MOVWUreg x) mem) => (MOVBstore [off] {sym} ptr x mem) | |
| (MOVHstore [off] {sym} ptr (MOVHreg x) mem) => (MOVHstore [off] {sym} ptr x mem) | |
| (MOVHstore [off] {sym} ptr (MOVWreg x) mem) => (MOVHstore [off] {sym} ptr x mem) | |
| (MOVHstore [off] {sym} ptr (MOVHUreg x) mem) => (MOVHstore [off] {sym} ptr x mem) | |
| (MOVHstore [off] {sym} ptr (MOVWUreg x) mem) => (MOVHstore [off] {sym} ptr x mem) | |
| (MOVWstore [off] {sym} ptr (MOVWreg x) mem) => (MOVWstore [off] {sym} ptr x mem) | |
| (MOVWstore [off] {sym} ptr (MOVWUreg x) mem) => (MOVWstore [off] {sym} ptr x mem) | |
| // Replace extend after load with alternate load where possible. | |
| (MOVBreg <t> x:(MOVBUload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVBload <t> [off] {sym} ptr mem) | |
| (MOVHreg <t> x:(MOVHUload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVHload <t> [off] {sym} ptr mem) | |
| (MOVWreg <t> x:(MOVWUload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVWload <t> [off] {sym} ptr mem) | |
| (MOVBUreg <t> x:(MOVBload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVBUload <t> [off] {sym} ptr mem) | |
| (MOVHUreg <t> x:(MOVHload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVHUload <t> [off] {sym} ptr mem) | |
| (MOVWUreg <t> x:(MOVWload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVWUload <t> [off] {sym} ptr mem) | |
| // If a register move has only 1 use, just use the same register without emitting instruction | |
| // MOVnop does not emit an instruction, only for ensuring the type. | |
| (MOVDreg x) && x.Uses == 1 => (MOVDnop x) | |
| // Fold constant into immediate instructions where possible. | |
| (ADD (MOVBconst [val]) x) => (ADDI [int64(val)] x) | |
| (ADD (MOVHconst [val]) x) => (ADDI [int64(val)] x) | |
| (ADD (MOVWconst [val]) x) => (ADDI [int64(val)] x) | |
| (ADD (MOVDconst [val]) x) && is32Bit(val) => (ADDI [val] x) | |
| (AND (MOVBconst [val]) x) => (ANDI [int64(val)] x) | |
| (AND (MOVHconst [val]) x) => (ANDI [int64(val)] x) | |
| (AND (MOVWconst [val]) x) => (ANDI [int64(val)] x) | |
| (AND (MOVDconst [val]) x) && is32Bit(val) => (ANDI [val] x) | |
| (OR (MOVBconst [val]) x) => (ORI [int64(val)] x) | |
| (OR (MOVHconst [val]) x) => (ORI [int64(val)] x) | |
| (OR (MOVWconst [val]) x) => (ORI [int64(val)] x) | |
| (OR (MOVDconst [val]) x) && is32Bit(val) => (ORI [val] x) | |
| (XOR (MOVBconst [val]) x) => (XORI [int64(val)] x) | |
| (XOR (MOVHconst [val]) x) => (XORI [int64(val)] x) | |
| (XOR (MOVWconst [val]) x) => (XORI [int64(val)] x) | |
| (XOR (MOVDconst [val]) x) && is32Bit(val) => (XORI [val] x) | |
| (SLL x (MOVBconst [val])) => (SLLI [int64(val&63)] x) | |
| (SLL x (MOVHconst [val])) => (SLLI [int64(val&63)] x) | |
| (SLL x (MOVWconst [val])) => (SLLI [int64(val&63)] x) | |
| (SLL x (MOVDconst [val])) => (SLLI [int64(val&63)] x) | |
| (SRL x (MOVBconst [val])) => (SRLI [int64(val&63)] x) | |
| (SRL x (MOVHconst [val])) => (SRLI [int64(val&63)] x) | |
| (SRL x (MOVWconst [val])) => (SRLI [int64(val&63)] x) | |
| (SRL x (MOVDconst [val])) => (SRLI [int64(val&63)] x) | |
| (SRA x (MOVBconst [val])) => (SRAI [int64(val&63)] x) | |
| (SRA x (MOVHconst [val])) => (SRAI [int64(val&63)] x) | |
| (SRA x (MOVWconst [val])) => (SRAI [int64(val&63)] x) | |
| (SRA x (MOVDconst [val])) => (SRAI [int64(val&63)] x) | |
| // Convert subtraction of a const into ADDI with negative immediate, where possible. | |
| (SUB x (MOVBconst [val])) => (ADDI [-int64(val)] x) | |
| (SUB x (MOVHconst [val])) => (ADDI [-int64(val)] x) | |
| (SUB x (MOVWconst [val])) && is32Bit(-int64(val)) => (ADDI [-int64(val)] x) | |
| (SUB x (MOVDconst [val])) && is32Bit(-val) => (ADDI [-val] x) | |
| // Subtraction of zero. | |
| (SUB x (MOVBconst [0])) => x | |
| (SUB x (MOVHconst [0])) => x | |
| (SUB x (MOVWconst [0])) => x | |
| (SUB x (MOVDconst [0])) => x | |
| // Subtraction of zero with sign extension. | |
| (SUBW x (MOVWconst [0])) => (ADDIW [0] x) | |
| // Subtraction from zero. | |
| (SUB (MOVBconst [0]) x) => (NEG x) | |
| (SUB (MOVHconst [0]) x) => (NEG x) | |
| (SUB (MOVWconst [0]) x) => (NEG x) | |
| (SUB (MOVDconst [0]) x) => (NEG x) | |
| // Subtraction from zero with sign extension. | |
| (SUBW (MOVDconst [0]) x) => (NEGW x) | |
| // Addition of zero. | |
| (ADDI [0] x) => x |