cmd/compile: add more generic rewrite rules to reassociate (op (op y C) x|C)
With this patch, opt pass can expose more obvious constant-folding
opportunites.
Example:
func test(i int) int {return (i+8)-(i+4)}
The previous version:
MOVD "".i(FP), R0
ADD $8, R0, R1
ADD $4, R0, R0
SUB R0, R1, R0
MOVD R0, "".~r1+8(FP)
RET (R30)
The optimized version:
MOVD $4, R0
MOVD R0, "".~r1+8(FP)
RET (R30)
This patch removes some existing reassociation rules, such as "x+(z-C)",
because the current generic rewrite rules will canonicalize "x-const"
to "x+(-const)", making "x+(z-C)" equal to "x+(z+(-C))".
This patch also adds test cases.
Change-Id: I857108ba0b5fcc18a879eeab38e2551bc4277797
Reviewed-on: https://go-review.googlesource.com/c/go/+/237137
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
diff --git a/src/cmd/compile/internal/ssa/gen/generic.rules b/src/cmd/compile/internal/ssa/gen/generic.rules
index 2d39d27..f7e6bbe 100644
--- a/src/cmd/compile/internal/ssa/gen/generic.rules
+++ b/src/cmd/compile/internal/ssa/gen/generic.rules
@@ -1807,6 +1807,8 @@
// invariant that pointers must stay within the pointed-to object,
// we can't pull part of a pointer computation above the AddPtr.
// See issue 37881.
+// Note: we don't need to handle any (x-C) cases because we already rewrite
+// (x-C) to (x+(-C)).
// x + (C + z) -> C + (x + z)
(Add64 (Add64 i:(Const64 <t>) z) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (Add64 i (Add64 <t> z x))
@@ -1820,23 +1822,29 @@
(Add16 (Sub16 i:(Const16 <t>) z) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Add16 i (Sub16 <t> x z))
(Add8 (Sub8 i:(Const8 <t>) z) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Add8 i (Sub8 <t> x z))
-// x + (z - C) -> (x + z) - C
-(Add64 (Sub64 z i:(Const64 <t>)) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (Sub64 (Add64 <t> x z) i)
-(Add32 (Sub32 z i:(Const32 <t>)) x) && (z.Op != OpConst32 && x.Op != OpConst32) => (Sub32 (Add32 <t> x z) i)
-(Add16 (Sub16 z i:(Const16 <t>)) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Sub16 (Add16 <t> x z) i)
-(Add8 (Sub8 z i:(Const8 <t>)) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Sub8 (Add8 <t> x z) i)
-
// x - (C - z) -> x + (z - C) -> (x + z) - C
(Sub64 x (Sub64 i:(Const64 <t>) z)) && (z.Op != OpConst64 && x.Op != OpConst64) => (Sub64 (Add64 <t> x z) i)
(Sub32 x (Sub32 i:(Const32 <t>) z)) && (z.Op != OpConst32 && x.Op != OpConst32) => (Sub32 (Add32 <t> x z) i)
(Sub16 x (Sub16 i:(Const16 <t>) z)) && (z.Op != OpConst16 && x.Op != OpConst16) => (Sub16 (Add16 <t> x z) i)
(Sub8 x (Sub8 i:(Const8 <t>) z)) && (z.Op != OpConst8 && x.Op != OpConst8) => (Sub8 (Add8 <t> x z) i)
-// x - (z - C) -> x + (C - z) -> (x - z) + C
-(Sub64 x (Sub64 z i:(Const64 <t>))) && (z.Op != OpConst64 && x.Op != OpConst64) => (Add64 i (Sub64 <t> x z))
-(Sub32 x (Sub32 z i:(Const32 <t>))) && (z.Op != OpConst32 && x.Op != OpConst32) => (Add32 i (Sub32 <t> x z))
-(Sub16 x (Sub16 z i:(Const16 <t>))) && (z.Op != OpConst16 && x.Op != OpConst16) => (Add16 i (Sub16 <t> x z))
-(Sub8 x (Sub8 z i:(Const8 <t>))) && (z.Op != OpConst8 && x.Op != OpConst8) => (Add8 i (Sub8 <t> x z))
+// x - (z + C) -> x + (-z - C) -> (x - z) - C
+(Sub64 x (Add64 z i:(Const64 <t>))) && (z.Op != OpConst64 && x.Op != OpConst64) => (Sub64 (Sub64 <t> x z) i)
+(Sub32 x (Add32 z i:(Const32 <t>))) && (z.Op != OpConst32 && x.Op != OpConst32) => (Sub32 (Sub32 <t> x z) i)
+(Sub16 x (Add16 z i:(Const16 <t>))) && (z.Op != OpConst16 && x.Op != OpConst16) => (Sub16 (Sub16 <t> x z) i)
+(Sub8 x (Add8 z i:(Const8 <t>))) && (z.Op != OpConst8 && x.Op != OpConst8) => (Sub8 (Sub8 <t> x z) i)
+
+// (C - z) - x -> C - (z + x)
+(Sub64 (Sub64 i:(Const64 <t>) z) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (Sub64 i (Add64 <t> z x))
+(Sub32 (Sub32 i:(Const32 <t>) z) x) && (z.Op != OpConst32 && x.Op != OpConst32) => (Sub32 i (Add32 <t> z x))
+(Sub16 (Sub16 i:(Const16 <t>) z) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Sub16 i (Add16 <t> z x))
+(Sub8 (Sub8 i:(Const8 <t>) z) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Sub8 i (Add8 <t> z x))
+
+// (z + C) -x -> C + (z - x)
+(Sub64 (Add64 z i:(Const64 <t>)) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (Add64 i (Sub64 <t> z x))
+(Sub32 (Add32 z i:(Const32 <t>)) x) && (z.Op != OpConst32 && x.Op != OpConst32) => (Add32 i (Sub32 <t> z x))
+(Sub16 (Add16 z i:(Const16 <t>)) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Add16 i (Sub16 <t> z x))
+(Sub8 (Add8 z i:(Const8 <t>)) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Add8 i (Sub8 <t> z x))
// x & (C & z) -> C & (x & z)
(And64 (And64 i:(Const64 <t>) z) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (And64 i (And64 <t> z x))
@@ -1856,6 +1864,12 @@
(Xor16 (Xor16 i:(Const16 <t>) z) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Xor16 i (Xor16 <t> z x))
(Xor8 (Xor8 i:(Const8 <t>) z) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Xor8 i (Xor8 <t> z x))
+// x * (D * z) = D * (x * z)
+(Mul64 (Mul64 i:(Const64 <t>) z) x) && (z.Op != OpConst64 && x.Op != OpConst64) => (Mul64 i (Mul64 <t> x z))
+(Mul32 (Mul32 i:(Const32 <t>) z) x) && (z.Op != OpConst32 && x.Op != OpConst32) => (Mul32 i (Mul32 <t> x z))
+(Mul16 (Mul16 i:(Const16 <t>) z) x) && (z.Op != OpConst16 && x.Op != OpConst16) => (Mul16 i (Mul16 <t> x z))
+(Mul8 (Mul8 i:(Const8 <t>) z) x) && (z.Op != OpConst8 && x.Op != OpConst8) => (Mul8 i (Mul8 <t> x z))
+
// C + (D + x) -> (C + D) + x
(Add64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) => (Add64 (Const64 <t> [c+d]) x)
(Add32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) => (Add32 (Const32 <t> [c+d]) x)
@@ -1868,24 +1882,18 @@
(Add16 (Const16 <t> [c]) (Sub16 (Const16 <t> [d]) x)) => (Sub16 (Const16 <t> [c+d]) x)
(Add8 (Const8 <t> [c]) (Sub8 (Const8 <t> [d]) x)) => (Sub8 (Const8 <t> [c+d]) x)
-// C + (x - D) -> (C - D) + x
-(Add64 (Const64 <t> [c]) (Sub64 x (Const64 <t> [d]))) => (Add64 (Const64 <t> [c-d]) x)
-(Add32 (Const32 <t> [c]) (Sub32 x (Const32 <t> [d]))) => (Add32 (Const32 <t> [c-d]) x)
-(Add16 (Const16 <t> [c]) (Sub16 x (Const16 <t> [d]))) => (Add16 (Const16 <t> [c-d]) x)
-(Add8 (Const8 <t> [c]) (Sub8 x (Const8 <t> [d]))) => (Add8 (Const8 <t> [c-d]) x)
-
-// C - (x - D) -> (C + D) - x
-(Sub64 (Const64 <t> [c]) (Sub64 x (Const64 <t> [d]))) => (Sub64 (Const64 <t> [c+d]) x)
-(Sub32 (Const32 <t> [c]) (Sub32 x (Const32 <t> [d]))) => (Sub32 (Const32 <t> [c+d]) x)
-(Sub16 (Const16 <t> [c]) (Sub16 x (Const16 <t> [d]))) => (Sub16 (Const16 <t> [c+d]) x)
-(Sub8 (Const8 <t> [c]) (Sub8 x (Const8 <t> [d]))) => (Sub8 (Const8 <t> [c+d]) x)
-
// C - (D - x) -> (C - D) + x
(Sub64 (Const64 <t> [c]) (Sub64 (Const64 <t> [d]) x)) => (Add64 (Const64 <t> [c-d]) x)
(Sub32 (Const32 <t> [c]) (Sub32 (Const32 <t> [d]) x)) => (Add32 (Const32 <t> [c-d]) x)
(Sub16 (Const16 <t> [c]) (Sub16 (Const16 <t> [d]) x)) => (Add16 (Const16 <t> [c-d]) x)
(Sub8 (Const8 <t> [c]) (Sub8 (Const8 <t> [d]) x)) => (Add8 (Const8 <t> [c-d]) x)
+// C - (D + x) -> (C - D) - x
+(Sub64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) => (Sub64 (Const64 <t> [c-d]) x)
+(Sub32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) => (Sub32 (Const32 <t> [c-d]) x)
+(Sub16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x)) => (Sub16 (Const16 <t> [c-d]) x)
+(Sub8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x)) => (Sub8 (Const8 <t> [c-d]) x)
+
// C & (D & x) -> (C & D) & x
(And64 (Const64 <t> [c]) (And64 (Const64 <t> [d]) x)) => (And64 (Const64 <t> [c&d]) x)
(And32 (Const32 <t> [c]) (And32 (Const32 <t> [d]) x)) => (And32 (Const32 <t> [c&d]) x)
diff --git a/src/cmd/compile/internal/ssa/rewritegeneric.go b/src/cmd/compile/internal/ssa/rewritegeneric.go
index 68e49f4..180e48b 100644
--- a/src/cmd/compile/internal/ssa/rewritegeneric.go
+++ b/src/cmd/compile/internal/ssa/rewritegeneric.go
@@ -588,33 +588,6 @@
}
break
}
- // match: (Add16 (Sub16 z i:(Const16 <t>)) x)
- // cond: (z.Op != OpConst16 && x.Op != OpConst16)
- // result: (Sub16 (Add16 <t> x z) i)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpSub16 {
- continue
- }
- _ = v_0.Args[1]
- z := v_0.Args[0]
- i := v_0.Args[1]
- if i.Op != OpConst16 {
- continue
- }
- t := i.Type
- x := v_1
- if !(z.Op != OpConst16 && x.Op != OpConst16) {
- continue
- }
- v.reset(OpSub16)
- v0 := b.NewValue0(v.Pos, OpAdd16, t)
- v0.AddArg2(x, z)
- v.AddArg2(v0, i)
- return true
- }
- break
- }
// match: (Add16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x))
// result: (Add16 (Const16 <t> [c+d]) x)
for {
@@ -671,33 +644,6 @@
}
break
}
- // match: (Add16 (Const16 <t> [c]) (Sub16 x (Const16 <t> [d])))
- // result: (Add16 (Const16 <t> [c-d]) x)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpConst16 {
- continue
- }
- t := v_0.Type
- c := auxIntToInt16(v_0.AuxInt)
- if v_1.Op != OpSub16 {
- continue
- }
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst16 || v_1_1.Type != t {
- continue
- }
- d := auxIntToInt16(v_1_1.AuxInt)
- v.reset(OpAdd16)
- v0 := b.NewValue0(v.Pos, OpConst16, t)
- v0.AuxInt = int16ToAuxInt(c - d)
- v.AddArg2(v0, x)
- return true
- }
- break
- }
return false
}
func rewriteValuegeneric_OpAdd32(v *Value) bool {
@@ -841,33 +787,6 @@
}
break
}
- // match: (Add32 (Sub32 z i:(Const32 <t>)) x)
- // cond: (z.Op != OpConst32 && x.Op != OpConst32)
- // result: (Sub32 (Add32 <t> x z) i)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpSub32 {
- continue
- }
- _ = v_0.Args[1]
- z := v_0.Args[0]
- i := v_0.Args[1]
- if i.Op != OpConst32 {
- continue
- }
- t := i.Type
- x := v_1
- if !(z.Op != OpConst32 && x.Op != OpConst32) {
- continue
- }
- v.reset(OpSub32)
- v0 := b.NewValue0(v.Pos, OpAdd32, t)
- v0.AddArg2(x, z)
- v.AddArg2(v0, i)
- return true
- }
- break
- }
// match: (Add32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x))
// result: (Add32 (Const32 <t> [c+d]) x)
for {
@@ -924,33 +843,6 @@
}
break
}
- // match: (Add32 (Const32 <t> [c]) (Sub32 x (Const32 <t> [d])))
- // result: (Add32 (Const32 <t> [c-d]) x)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpConst32 {
- continue
- }
- t := v_0.Type
- c := auxIntToInt32(v_0.AuxInt)
- if v_1.Op != OpSub32 {
- continue
- }
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst32 || v_1_1.Type != t {
- continue
- }
- d := auxIntToInt32(v_1_1.AuxInt)
- v.reset(OpAdd32)
- v0 := b.NewValue0(v.Pos, OpConst32, t)
- v0.AuxInt = int32ToAuxInt(c - d)
- v.AddArg2(v0, x)
- return true
- }
- break
- }
return false
}
func rewriteValuegeneric_OpAdd32F(v *Value) bool {
@@ -1121,33 +1013,6 @@
}
break
}
- // match: (Add64 (Sub64 z i:(Const64 <t>)) x)
- // cond: (z.Op != OpConst64 && x.Op != OpConst64)
- // result: (Sub64 (Add64 <t> x z) i)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpSub64 {
- continue
- }
- _ = v_0.Args[1]
- z := v_0.Args[0]
- i := v_0.Args[1]
- if i.Op != OpConst64 {
- continue
- }
- t := i.Type
- x := v_1
- if !(z.Op != OpConst64 && x.Op != OpConst64) {
- continue
- }
- v.reset(OpSub64)
- v0 := b.NewValue0(v.Pos, OpAdd64, t)
- v0.AddArg2(x, z)
- v.AddArg2(v0, i)
- return true
- }
- break
- }
// match: (Add64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x))
// result: (Add64 (Const64 <t> [c+d]) x)
for {
@@ -1204,33 +1069,6 @@
}
break
}
- // match: (Add64 (Const64 <t> [c]) (Sub64 x (Const64 <t> [d])))
- // result: (Add64 (Const64 <t> [c-d]) x)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpConst64 {
- continue
- }
- t := v_0.Type
- c := auxIntToInt64(v_0.AuxInt)
- if v_1.Op != OpSub64 {
- continue
- }
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst64 || v_1_1.Type != t {
- continue
- }
- d := auxIntToInt64(v_1_1.AuxInt)
- v.reset(OpAdd64)
- v0 := b.NewValue0(v.Pos, OpConst64, t)
- v0.AuxInt = int64ToAuxInt(c - d)
- v.AddArg2(v0, x)
- return true
- }
- break
- }
return false
}
func rewriteValuegeneric_OpAdd64F(v *Value) bool {
@@ -1401,33 +1239,6 @@
}
break
}
- // match: (Add8 (Sub8 z i:(Const8 <t>)) x)
- // cond: (z.Op != OpConst8 && x.Op != OpConst8)
- // result: (Sub8 (Add8 <t> x z) i)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpSub8 {
- continue
- }
- _ = v_0.Args[1]
- z := v_0.Args[0]
- i := v_0.Args[1]
- if i.Op != OpConst8 {
- continue
- }
- t := i.Type
- x := v_1
- if !(z.Op != OpConst8 && x.Op != OpConst8) {
- continue
- }
- v.reset(OpSub8)
- v0 := b.NewValue0(v.Pos, OpAdd8, t)
- v0.AddArg2(x, z)
- v.AddArg2(v0, i)
- return true
- }
- break
- }
// match: (Add8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x))
// result: (Add8 (Const8 <t> [c+d]) x)
for {
@@ -1484,33 +1295,6 @@
}
break
}
- // match: (Add8 (Const8 <t> [c]) (Sub8 x (Const8 <t> [d])))
- // result: (Add8 (Const8 <t> [c-d]) x)
- for {
- for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
- if v_0.Op != OpConst8 {
- continue
- }
- t := v_0.Type
- c := auxIntToInt8(v_0.AuxInt)
- if v_1.Op != OpSub8 {
- continue
- }
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst8 || v_1_1.Type != t {
- continue
- }
- d := auxIntToInt8(v_1_1.AuxInt)
- v.reset(OpAdd8)
- v0 := b.NewValue0(v.Pos, OpConst8, t)
- v0.AuxInt = int8ToAuxInt(c - d)
- v.AddArg2(v0, x)
- return true
- }
- break
- }
return false
}
func rewriteValuegeneric_OpAddPtr(v *Value) bool {
@@ -13922,6 +13706,37 @@
}
break
}
+ // match: (Mul16 (Mul16 i:(Const16 <t>) z) x)
+ // cond: (z.Op != OpConst16 && x.Op != OpConst16)
+ // result: (Mul16 i (Mul16 <t> x z))
+ for {
+ for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
+ if v_0.Op != OpMul16 {
+ continue
+ }
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i1 := 0; _i1 <= 1; _i1, v_0_0, v_0_1 = _i1+1, v_0_1, v_0_0 {
+ i := v_0_0
+ if i.Op != OpConst16 {
+ continue
+ }
+ t := i.Type
+ z := v_0_1
+ x := v_1
+ if !(z.Op != OpConst16 && x.Op != OpConst16) {
+ continue
+ }
+ v.reset(OpMul16)
+ v0 := b.NewValue0(v.Pos, OpMul16, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(i, v0)
+ return true
+ }
+ }
+ break
+ }
// match: (Mul16 (Const16 <t> [c]) (Mul16 (Const16 <t> [d]) x))
// result: (Mul16 (Const16 <t> [c*d]) x)
for {
@@ -14098,6 +13913,37 @@
}
break
}
+ // match: (Mul32 (Mul32 i:(Const32 <t>) z) x)
+ // cond: (z.Op != OpConst32 && x.Op != OpConst32)
+ // result: (Mul32 i (Mul32 <t> x z))
+ for {
+ for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
+ if v_0.Op != OpMul32 {
+ continue
+ }
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i1 := 0; _i1 <= 1; _i1, v_0_0, v_0_1 = _i1+1, v_0_1, v_0_0 {
+ i := v_0_0
+ if i.Op != OpConst32 {
+ continue
+ }
+ t := i.Type
+ z := v_0_1
+ x := v_1
+ if !(z.Op != OpConst32 && x.Op != OpConst32) {
+ continue
+ }
+ v.reset(OpMul32)
+ v0 := b.NewValue0(v.Pos, OpMul32, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(i, v0)
+ return true
+ }
+ }
+ break
+ }
// match: (Mul32 (Const32 <t> [c]) (Mul32 (Const32 <t> [d]) x))
// result: (Mul32 (Const32 <t> [c*d]) x)
for {
@@ -14342,6 +14188,37 @@
}
break
}
+ // match: (Mul64 (Mul64 i:(Const64 <t>) z) x)
+ // cond: (z.Op != OpConst64 && x.Op != OpConst64)
+ // result: (Mul64 i (Mul64 <t> x z))
+ for {
+ for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
+ if v_0.Op != OpMul64 {
+ continue
+ }
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i1 := 0; _i1 <= 1; _i1, v_0_0, v_0_1 = _i1+1, v_0_1, v_0_0 {
+ i := v_0_0
+ if i.Op != OpConst64 {
+ continue
+ }
+ t := i.Type
+ z := v_0_1
+ x := v_1
+ if !(z.Op != OpConst64 && x.Op != OpConst64) {
+ continue
+ }
+ v.reset(OpMul64)
+ v0 := b.NewValue0(v.Pos, OpMul64, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(i, v0)
+ return true
+ }
+ }
+ break
+ }
// match: (Mul64 (Const64 <t> [c]) (Mul64 (Const64 <t> [d]) x))
// result: (Mul64 (Const64 <t> [c*d]) x)
for {
@@ -14552,6 +14429,37 @@
}
break
}
+ // match: (Mul8 (Mul8 i:(Const8 <t>) z) x)
+ // cond: (z.Op != OpConst8 && x.Op != OpConst8)
+ // result: (Mul8 i (Mul8 <t> x z))
+ for {
+ for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
+ if v_0.Op != OpMul8 {
+ continue
+ }
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i1 := 0; _i1 <= 1; _i1, v_0_0, v_0_1 = _i1+1, v_0_1, v_0_0 {
+ i := v_0_0
+ if i.Op != OpConst8 {
+ continue
+ }
+ t := i.Type
+ z := v_0_1
+ x := v_1
+ if !(z.Op != OpConst8 && x.Op != OpConst8) {
+ continue
+ }
+ v.reset(OpMul8)
+ v0 := b.NewValue0(v.Pos, OpMul8, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(i, v0)
+ return true
+ }
+ }
+ break
+ }
// match: (Mul8 (Const8 <t> [c]) (Mul8 (Const8 <t> [d]) x))
// result: (Mul8 (Const8 <t> [c*d]) x)
for {
@@ -22432,53 +22340,86 @@
v.AddArg2(v0, i)
return true
}
- // match: (Sub16 x (Sub16 z i:(Const16 <t>)))
+ // match: (Sub16 x (Add16 z i:(Const16 <t>)))
// cond: (z.Op != OpConst16 && x.Op != OpConst16)
- // result: (Add16 i (Sub16 <t> x z))
+ // result: (Sub16 (Sub16 <t> x z) i)
for {
x := v_0
- if v_1.Op != OpSub16 {
+ if v_1.Op != OpAdd16 {
break
}
_ = v_1.Args[1]
- z := v_1.Args[0]
- i := v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ z := v_1_0
+ i := v_1_1
+ if i.Op != OpConst16 {
+ continue
+ }
+ t := i.Type
+ if !(z.Op != OpConst16 && x.Op != OpConst16) {
+ continue
+ }
+ v.reset(OpSub16)
+ v0 := b.NewValue0(v.Pos, OpSub16, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(v0, i)
+ return true
+ }
+ break
+ }
+ // match: (Sub16 (Sub16 i:(Const16 <t>) z) x)
+ // cond: (z.Op != OpConst16 && x.Op != OpConst16)
+ // result: (Sub16 i (Add16 <t> z x))
+ for {
+ if v_0.Op != OpSub16 {
+ break
+ }
+ z := v_0.Args[1]
+ i := v_0.Args[0]
if i.Op != OpConst16 {
break
}
t := i.Type
+ x := v_1
if !(z.Op != OpConst16 && x.Op != OpConst16) {
break
}
- v.reset(OpAdd16)
- v0 := b.NewValue0(v.Pos, OpSub16, t)
- v0.AddArg2(x, z)
+ v.reset(OpSub16)
+ v0 := b.NewValue0(v.Pos, OpAdd16, t)
+ v0.AddArg2(z, x)
v.AddArg2(i, v0)
return true
}
- // match: (Sub16 (Const16 <t> [c]) (Sub16 x (Const16 <t> [d])))
- // result: (Sub16 (Const16 <t> [c+d]) x)
+ // match: (Sub16 (Add16 z i:(Const16 <t>)) x)
+ // cond: (z.Op != OpConst16 && x.Op != OpConst16)
+ // result: (Add16 i (Sub16 <t> z x))
for {
- if v_0.Op != OpConst16 {
+ if v_0.Op != OpAdd16 {
break
}
- t := v_0.Type
- c := auxIntToInt16(v_0.AuxInt)
- if v_1.Op != OpSub16 {
- break
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_0_0, v_0_1 = _i0+1, v_0_1, v_0_0 {
+ z := v_0_0
+ i := v_0_1
+ if i.Op != OpConst16 {
+ continue
+ }
+ t := i.Type
+ x := v_1
+ if !(z.Op != OpConst16 && x.Op != OpConst16) {
+ continue
+ }
+ v.reset(OpAdd16)
+ v0 := b.NewValue0(v.Pos, OpSub16, t)
+ v0.AddArg2(z, x)
+ v.AddArg2(i, v0)
+ return true
}
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst16 || v_1_1.Type != t {
- break
- }
- d := auxIntToInt16(v_1_1.AuxInt)
- v.reset(OpSub16)
- v0 := b.NewValue0(v.Pos, OpConst16, t)
- v0.AuxInt = int16ToAuxInt(c + d)
- v.AddArg2(v0, x)
- return true
+ break
}
// match: (Sub16 (Const16 <t> [c]) (Sub16 (Const16 <t> [d]) x))
// result: (Add16 (Const16 <t> [c-d]) x)
@@ -22503,6 +22444,34 @@
v.AddArg2(v0, x)
return true
}
+ // match: (Sub16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x))
+ // result: (Sub16 (Const16 <t> [c-d]) x)
+ for {
+ if v_0.Op != OpConst16 {
+ break
+ }
+ t := v_0.Type
+ c := auxIntToInt16(v_0.AuxInt)
+ if v_1.Op != OpAdd16 {
+ break
+ }
+ _ = v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ if v_1_0.Op != OpConst16 || v_1_0.Type != t {
+ continue
+ }
+ d := auxIntToInt16(v_1_0.AuxInt)
+ x := v_1_1
+ v.reset(OpSub16)
+ v0 := b.NewValue0(v.Pos, OpConst16, t)
+ v0.AuxInt = int16ToAuxInt(c - d)
+ v.AddArg2(v0, x)
+ return true
+ }
+ break
+ }
return false
}
func rewriteValuegeneric_OpSub32(v *Value) bool {
@@ -22650,53 +22619,86 @@
v.AddArg2(v0, i)
return true
}
- // match: (Sub32 x (Sub32 z i:(Const32 <t>)))
+ // match: (Sub32 x (Add32 z i:(Const32 <t>)))
// cond: (z.Op != OpConst32 && x.Op != OpConst32)
- // result: (Add32 i (Sub32 <t> x z))
+ // result: (Sub32 (Sub32 <t> x z) i)
for {
x := v_0
- if v_1.Op != OpSub32 {
+ if v_1.Op != OpAdd32 {
break
}
_ = v_1.Args[1]
- z := v_1.Args[0]
- i := v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ z := v_1_0
+ i := v_1_1
+ if i.Op != OpConst32 {
+ continue
+ }
+ t := i.Type
+ if !(z.Op != OpConst32 && x.Op != OpConst32) {
+ continue
+ }
+ v.reset(OpSub32)
+ v0 := b.NewValue0(v.Pos, OpSub32, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(v0, i)
+ return true
+ }
+ break
+ }
+ // match: (Sub32 (Sub32 i:(Const32 <t>) z) x)
+ // cond: (z.Op != OpConst32 && x.Op != OpConst32)
+ // result: (Sub32 i (Add32 <t> z x))
+ for {
+ if v_0.Op != OpSub32 {
+ break
+ }
+ z := v_0.Args[1]
+ i := v_0.Args[0]
if i.Op != OpConst32 {
break
}
t := i.Type
+ x := v_1
if !(z.Op != OpConst32 && x.Op != OpConst32) {
break
}
- v.reset(OpAdd32)
- v0 := b.NewValue0(v.Pos, OpSub32, t)
- v0.AddArg2(x, z)
+ v.reset(OpSub32)
+ v0 := b.NewValue0(v.Pos, OpAdd32, t)
+ v0.AddArg2(z, x)
v.AddArg2(i, v0)
return true
}
- // match: (Sub32 (Const32 <t> [c]) (Sub32 x (Const32 <t> [d])))
- // result: (Sub32 (Const32 <t> [c+d]) x)
+ // match: (Sub32 (Add32 z i:(Const32 <t>)) x)
+ // cond: (z.Op != OpConst32 && x.Op != OpConst32)
+ // result: (Add32 i (Sub32 <t> z x))
for {
- if v_0.Op != OpConst32 {
+ if v_0.Op != OpAdd32 {
break
}
- t := v_0.Type
- c := auxIntToInt32(v_0.AuxInt)
- if v_1.Op != OpSub32 {
- break
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_0_0, v_0_1 = _i0+1, v_0_1, v_0_0 {
+ z := v_0_0
+ i := v_0_1
+ if i.Op != OpConst32 {
+ continue
+ }
+ t := i.Type
+ x := v_1
+ if !(z.Op != OpConst32 && x.Op != OpConst32) {
+ continue
+ }
+ v.reset(OpAdd32)
+ v0 := b.NewValue0(v.Pos, OpSub32, t)
+ v0.AddArg2(z, x)
+ v.AddArg2(i, v0)
+ return true
}
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst32 || v_1_1.Type != t {
- break
- }
- d := auxIntToInt32(v_1_1.AuxInt)
- v.reset(OpSub32)
- v0 := b.NewValue0(v.Pos, OpConst32, t)
- v0.AuxInt = int32ToAuxInt(c + d)
- v.AddArg2(v0, x)
- return true
+ break
}
// match: (Sub32 (Const32 <t> [c]) (Sub32 (Const32 <t> [d]) x))
// result: (Add32 (Const32 <t> [c-d]) x)
@@ -22721,6 +22723,34 @@
v.AddArg2(v0, x)
return true
}
+ // match: (Sub32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x))
+ // result: (Sub32 (Const32 <t> [c-d]) x)
+ for {
+ if v_0.Op != OpConst32 {
+ break
+ }
+ t := v_0.Type
+ c := auxIntToInt32(v_0.AuxInt)
+ if v_1.Op != OpAdd32 {
+ break
+ }
+ _ = v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ if v_1_0.Op != OpConst32 || v_1_0.Type != t {
+ continue
+ }
+ d := auxIntToInt32(v_1_0.AuxInt)
+ x := v_1_1
+ v.reset(OpSub32)
+ v0 := b.NewValue0(v.Pos, OpConst32, t)
+ v0.AuxInt = int32ToAuxInt(c - d)
+ v.AddArg2(v0, x)
+ return true
+ }
+ break
+ }
return false
}
func rewriteValuegeneric_OpSub32F(v *Value) bool {
@@ -22892,53 +22922,86 @@
v.AddArg2(v0, i)
return true
}
- // match: (Sub64 x (Sub64 z i:(Const64 <t>)))
+ // match: (Sub64 x (Add64 z i:(Const64 <t>)))
// cond: (z.Op != OpConst64 && x.Op != OpConst64)
- // result: (Add64 i (Sub64 <t> x z))
+ // result: (Sub64 (Sub64 <t> x z) i)
for {
x := v_0
- if v_1.Op != OpSub64 {
+ if v_1.Op != OpAdd64 {
break
}
_ = v_1.Args[1]
- z := v_1.Args[0]
- i := v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ z := v_1_0
+ i := v_1_1
+ if i.Op != OpConst64 {
+ continue
+ }
+ t := i.Type
+ if !(z.Op != OpConst64 && x.Op != OpConst64) {
+ continue
+ }
+ v.reset(OpSub64)
+ v0 := b.NewValue0(v.Pos, OpSub64, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(v0, i)
+ return true
+ }
+ break
+ }
+ // match: (Sub64 (Sub64 i:(Const64 <t>) z) x)
+ // cond: (z.Op != OpConst64 && x.Op != OpConst64)
+ // result: (Sub64 i (Add64 <t> z x))
+ for {
+ if v_0.Op != OpSub64 {
+ break
+ }
+ z := v_0.Args[1]
+ i := v_0.Args[0]
if i.Op != OpConst64 {
break
}
t := i.Type
+ x := v_1
if !(z.Op != OpConst64 && x.Op != OpConst64) {
break
}
- v.reset(OpAdd64)
- v0 := b.NewValue0(v.Pos, OpSub64, t)
- v0.AddArg2(x, z)
+ v.reset(OpSub64)
+ v0 := b.NewValue0(v.Pos, OpAdd64, t)
+ v0.AddArg2(z, x)
v.AddArg2(i, v0)
return true
}
- // match: (Sub64 (Const64 <t> [c]) (Sub64 x (Const64 <t> [d])))
- // result: (Sub64 (Const64 <t> [c+d]) x)
+ // match: (Sub64 (Add64 z i:(Const64 <t>)) x)
+ // cond: (z.Op != OpConst64 && x.Op != OpConst64)
+ // result: (Add64 i (Sub64 <t> z x))
for {
- if v_0.Op != OpConst64 {
+ if v_0.Op != OpAdd64 {
break
}
- t := v_0.Type
- c := auxIntToInt64(v_0.AuxInt)
- if v_1.Op != OpSub64 {
- break
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_0_0, v_0_1 = _i0+1, v_0_1, v_0_0 {
+ z := v_0_0
+ i := v_0_1
+ if i.Op != OpConst64 {
+ continue
+ }
+ t := i.Type
+ x := v_1
+ if !(z.Op != OpConst64 && x.Op != OpConst64) {
+ continue
+ }
+ v.reset(OpAdd64)
+ v0 := b.NewValue0(v.Pos, OpSub64, t)
+ v0.AddArg2(z, x)
+ v.AddArg2(i, v0)
+ return true
}
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst64 || v_1_1.Type != t {
- break
- }
- d := auxIntToInt64(v_1_1.AuxInt)
- v.reset(OpSub64)
- v0 := b.NewValue0(v.Pos, OpConst64, t)
- v0.AuxInt = int64ToAuxInt(c + d)
- v.AddArg2(v0, x)
- return true
+ break
}
// match: (Sub64 (Const64 <t> [c]) (Sub64 (Const64 <t> [d]) x))
// result: (Add64 (Const64 <t> [c-d]) x)
@@ -22963,6 +23026,34 @@
v.AddArg2(v0, x)
return true
}
+ // match: (Sub64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x))
+ // result: (Sub64 (Const64 <t> [c-d]) x)
+ for {
+ if v_0.Op != OpConst64 {
+ break
+ }
+ t := v_0.Type
+ c := auxIntToInt64(v_0.AuxInt)
+ if v_1.Op != OpAdd64 {
+ break
+ }
+ _ = v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ if v_1_0.Op != OpConst64 || v_1_0.Type != t {
+ continue
+ }
+ d := auxIntToInt64(v_1_0.AuxInt)
+ x := v_1_1
+ v.reset(OpSub64)
+ v0 := b.NewValue0(v.Pos, OpConst64, t)
+ v0.AuxInt = int64ToAuxInt(c - d)
+ v.AddArg2(v0, x)
+ return true
+ }
+ break
+ }
return false
}
func rewriteValuegeneric_OpSub64F(v *Value) bool {
@@ -23134,53 +23225,86 @@
v.AddArg2(v0, i)
return true
}
- // match: (Sub8 x (Sub8 z i:(Const8 <t>)))
+ // match: (Sub8 x (Add8 z i:(Const8 <t>)))
// cond: (z.Op != OpConst8 && x.Op != OpConst8)
- // result: (Add8 i (Sub8 <t> x z))
+ // result: (Sub8 (Sub8 <t> x z) i)
for {
x := v_0
- if v_1.Op != OpSub8 {
+ if v_1.Op != OpAdd8 {
break
}
_ = v_1.Args[1]
- z := v_1.Args[0]
- i := v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ z := v_1_0
+ i := v_1_1
+ if i.Op != OpConst8 {
+ continue
+ }
+ t := i.Type
+ if !(z.Op != OpConst8 && x.Op != OpConst8) {
+ continue
+ }
+ v.reset(OpSub8)
+ v0 := b.NewValue0(v.Pos, OpSub8, t)
+ v0.AddArg2(x, z)
+ v.AddArg2(v0, i)
+ return true
+ }
+ break
+ }
+ // match: (Sub8 (Sub8 i:(Const8 <t>) z) x)
+ // cond: (z.Op != OpConst8 && x.Op != OpConst8)
+ // result: (Sub8 i (Add8 <t> z x))
+ for {
+ if v_0.Op != OpSub8 {
+ break
+ }
+ z := v_0.Args[1]
+ i := v_0.Args[0]
if i.Op != OpConst8 {
break
}
t := i.Type
+ x := v_1
if !(z.Op != OpConst8 && x.Op != OpConst8) {
break
}
- v.reset(OpAdd8)
- v0 := b.NewValue0(v.Pos, OpSub8, t)
- v0.AddArg2(x, z)
+ v.reset(OpSub8)
+ v0 := b.NewValue0(v.Pos, OpAdd8, t)
+ v0.AddArg2(z, x)
v.AddArg2(i, v0)
return true
}
- // match: (Sub8 (Const8 <t> [c]) (Sub8 x (Const8 <t> [d])))
- // result: (Sub8 (Const8 <t> [c+d]) x)
+ // match: (Sub8 (Add8 z i:(Const8 <t>)) x)
+ // cond: (z.Op != OpConst8 && x.Op != OpConst8)
+ // result: (Add8 i (Sub8 <t> z x))
for {
- if v_0.Op != OpConst8 {
+ if v_0.Op != OpAdd8 {
break
}
- t := v_0.Type
- c := auxIntToInt8(v_0.AuxInt)
- if v_1.Op != OpSub8 {
- break
+ _ = v_0.Args[1]
+ v_0_0 := v_0.Args[0]
+ v_0_1 := v_0.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_0_0, v_0_1 = _i0+1, v_0_1, v_0_0 {
+ z := v_0_0
+ i := v_0_1
+ if i.Op != OpConst8 {
+ continue
+ }
+ t := i.Type
+ x := v_1
+ if !(z.Op != OpConst8 && x.Op != OpConst8) {
+ continue
+ }
+ v.reset(OpAdd8)
+ v0 := b.NewValue0(v.Pos, OpSub8, t)
+ v0.AddArg2(z, x)
+ v.AddArg2(i, v0)
+ return true
}
- _ = v_1.Args[1]
- x := v_1.Args[0]
- v_1_1 := v_1.Args[1]
- if v_1_1.Op != OpConst8 || v_1_1.Type != t {
- break
- }
- d := auxIntToInt8(v_1_1.AuxInt)
- v.reset(OpSub8)
- v0 := b.NewValue0(v.Pos, OpConst8, t)
- v0.AuxInt = int8ToAuxInt(c + d)
- v.AddArg2(v0, x)
- return true
+ break
}
// match: (Sub8 (Const8 <t> [c]) (Sub8 (Const8 <t> [d]) x))
// result: (Add8 (Const8 <t> [c-d]) x)
@@ -23205,6 +23329,34 @@
v.AddArg2(v0, x)
return true
}
+ // match: (Sub8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x))
+ // result: (Sub8 (Const8 <t> [c-d]) x)
+ for {
+ if v_0.Op != OpConst8 {
+ break
+ }
+ t := v_0.Type
+ c := auxIntToInt8(v_0.AuxInt)
+ if v_1.Op != OpAdd8 {
+ break
+ }
+ _ = v_1.Args[1]
+ v_1_0 := v_1.Args[0]
+ v_1_1 := v_1.Args[1]
+ for _i0 := 0; _i0 <= 1; _i0, v_1_0, v_1_1 = _i0+1, v_1_1, v_1_0 {
+ if v_1_0.Op != OpConst8 || v_1_0.Type != t {
+ continue
+ }
+ d := auxIntToInt8(v_1_0.AuxInt)
+ x := v_1_1
+ v.reset(OpSub8)
+ v0 := b.NewValue0(v.Pos, OpConst8, t)
+ v0.AuxInt = int8ToAuxInt(c - d)
+ v.AddArg2(v0, x)
+ return true
+ }
+ break
+ }
return false
}
func rewriteValuegeneric_OpTrunc16to8(v *Value) bool {
diff --git a/test/codegen/arithmetic.go b/test/codegen/arithmetic.go
index 45fdb68..afd4d66 100644
--- a/test/codegen/arithmetic.go
+++ b/test/codegen/arithmetic.go
@@ -462,7 +462,6 @@
return a, b, c
}
-
// Divide -> shift rules usually require fixup for negative inputs.
// If the input is non-negative, make sure the fixup is eliminated.
func divInt(v int64) int64 {
@@ -472,3 +471,33 @@
// amd64:-`.*SARQ.*63,`, -".*SHRQ", ".*SARQ.*[$]9,"
return v / 512
}
+
+// The reassociate rules "x - (z + C) -> (x - z) - C" and
+// "(z + C) -x -> C + (z - x)" can optimize the following cases.
+func constantFold1(i0, j0, i1, j1, i2, j2, i3, j3 int) (int, int, int, int) {
+ // arm64:"SUB","ADD\t[$]2"
+ r0 := (i0 + 3) - (j0 + 1)
+ // arm64:"SUB","SUB\t[$]4"
+ r1 := (i1 - 3) - (j1 + 1)
+ // arm64:"SUB","ADD\t[$]4"
+ r2 := (i2 + 3) - (j2 - 1)
+ // arm64:"SUB","SUB\t[$]2"
+ r3 := (i3 - 3) - (j3 - 1)
+ return r0, r1, r2, r3
+}
+
+// The reassociate rules "x - (z + C) -> (x - z) - C" and
+// "(C - z) - x -> C - (z + x)" can optimize the following cases.
+func constantFold2(i0, j0, i1, j1 int) (int, int) {
+ // arm64:"ADD","MOVD\t[$]2","SUB"
+ r0 := (3 - i0) - (j0 + 1)
+ // arm64:"ADD","MOVD\t[$]4","SUB"
+ r1 := (3 - i1) - (j1 - 1)
+ return r0, r1
+}
+
+func constantFold3(i, j int) int {
+ // arm64: "MOVD\t[$]30","MUL",-"ADD",-"LSL"
+ r := (5 * i) * (6 * j)
+ return r
+}
