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cmd/compile: optimise -x - ^x, ^x - -x and ^x + x

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This commit is contained in:
Jorropo 2022-04-18 07:24:54 +02:00
parent 8b639edf1d
commit 2d95831574
2 changed files with 184 additions and 0 deletions
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4
src/cmd/compile/internal/ssa/gen/generic.rules
View File

@ -538,6 +538,10 @@
(Xor(64|32|16|8) (Const(64|32|16|8) [-1]) x) => (Com(64|32|16|8) x)
(Sub(64|32|16|8) (Neg(64|32|16|8) x) (Com(64|32|16|8) x)) => (Const(64|32|16|8) [1])
(Sub(64|32|16|8) (Com(64|32|16|8) x) (Neg(64|32|16|8) x)) => (Const(64|32|16|8) [-1])
(Add(64|32|16|8) (Com(64|32|16|8) x) x) => (Const(64|32|16|8) [-1])
// ^(x-1) == ^x+1 == -x
(Add(64|32|16|8) (Const(64|32|16|8) [1]) (Com(64|32|16|8) x)) => (Neg(64|32|16|8) x)
(Com(64|32|16|8) (Add(64|32|16|8) (Const(64|32|16|8) [-1]) x)) => (Neg(64|32|16|8) x)

180
src/cmd/compile/internal/ssa/rewritegeneric.go
View File

@ -534,6 +534,23 @@ func rewriteValuegeneric_OpAdd16(v *Value) bool {
}
break
}
// match: (Add16 (Com16 x) x)
// result: (Const16 [-1])
for {
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
if v_0.Op != OpCom16 {
continue
}
x := v_0.Args[0]
if x != v_1 {
continue
}
v.reset(OpConst16)
v.AuxInt = int16ToAuxInt(-1)
return true
}
break
}
// match: (Add16 (Const16 [1]) (Com16 x))
// result: (Neg16 x)
for {
@ -794,6 +811,23 @@ func rewriteValuegeneric_OpAdd32(v *Value) bool {
}
break
}
// match: (Add32 (Com32 x) x)
// result: (Const32 [-1])
for {
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
if v_0.Op != OpCom32 {
continue
}
x := v_0.Args[0]
if x != v_1 {
continue
}
v.reset(OpConst32)
v.AuxInt = int32ToAuxInt(-1)
return true
}
break
}
// match: (Add32 (Const32 [1]) (Com32 x))
// result: (Neg32 x)
for {
@ -1081,6 +1115,23 @@ func rewriteValuegeneric_OpAdd64(v *Value) bool {
}
break
}
// match: (Add64 (Com64 x) x)
// result: (Const64 [-1])
for {
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
if v_0.Op != OpCom64 {
continue
}
x := v_0.Args[0]
if x != v_1 {
continue
}
v.reset(OpConst64)
v.AuxInt = int64ToAuxInt(-1)
return true
}
break
}
// match: (Add64 (Const64 [1]) (Com64 x))
// result: (Neg64 x)
for {
@ -1368,6 +1419,23 @@ func rewriteValuegeneric_OpAdd8(v *Value) bool {
}
break
}
// match: (Add8 (Com8 x) x)
// result: (Const8 [-1])
for {
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
if v_0.Op != OpCom8 {
continue
}
x := v_0.Args[0]
if x != v_1 {
continue
}
v.reset(OpConst8)
v.AuxInt = int8ToAuxInt(-1)
return true
}
break
}
// match: (Add8 (Const8 [1]) (Com8 x))
// result: (Neg8 x)
for {
@ -23122,6 +23190,34 @@ func rewriteValuegeneric_OpSub16(v *Value) bool {
v.AuxInt = int16ToAuxInt(0)
return true
}
// match: (Sub16 (Neg16 x) (Com16 x))
// result: (Const16 [1])
for {
if v_0.Op != OpNeg16 {
break
}
x := v_0.Args[0]
if v_1.Op != OpCom16 || x != v_1.Args[0] {
break
}
v.reset(OpConst16)
v.AuxInt = int16ToAuxInt(1)
return true
}
// match: (Sub16 (Com16 x) (Neg16 x))
// result: (Const16 [-1])
for {
if v_0.Op != OpCom16 {
break
}
x := v_0.Args[0]
if v_1.Op != OpNeg16 || x != v_1.Args[0] {
break
}
v.reset(OpConst16)
v.AuxInt = int16ToAuxInt(-1)
return true
}
// match: (Sub16 (Add16 x y) x)
// result: y
for {
@ -23437,6 +23533,34 @@ func rewriteValuegeneric_OpSub32(v *Value) bool {
v.AuxInt = int32ToAuxInt(0)
return true
}
// match: (Sub32 (Neg32 x) (Com32 x))
// result: (Const32 [1])
for {
if v_0.Op != OpNeg32 {
break
}
x := v_0.Args[0]
if v_1.Op != OpCom32 || x != v_1.Args[0] {
break
}
v.reset(OpConst32)
v.AuxInt = int32ToAuxInt(1)
return true
}
// match: (Sub32 (Com32 x) (Neg32 x))
// result: (Const32 [-1])
for {
if v_0.Op != OpCom32 {
break
}
x := v_0.Args[0]
if v_1.Op != OpNeg32 || x != v_1.Args[0] {
break
}
v.reset(OpConst32)
v.AuxInt = int32ToAuxInt(-1)
return true
}
// match: (Sub32 (Add32 x y) x)
// result: y
for {
@ -23776,6 +23900,34 @@ func rewriteValuegeneric_OpSub64(v *Value) bool {
v.AuxInt = int64ToAuxInt(0)
return true
}
// match: (Sub64 (Neg64 x) (Com64 x))
// result: (Const64 [1])
for {
if v_0.Op != OpNeg64 {
break
}
x := v_0.Args[0]
if v_1.Op != OpCom64 || x != v_1.Args[0] {
break
}
v.reset(OpConst64)
v.AuxInt = int64ToAuxInt(1)
return true
}
// match: (Sub64 (Com64 x) (Neg64 x))
// result: (Const64 [-1])
for {
if v_0.Op != OpCom64 {
break
}
x := v_0.Args[0]
if v_1.Op != OpNeg64 || x != v_1.Args[0] {
break
}
v.reset(OpConst64)
v.AuxInt = int64ToAuxInt(-1)
return true
}
// match: (Sub64 (Add64 x y) x)
// result: y
for {
@ -24115,6 +24267,34 @@ func rewriteValuegeneric_OpSub8(v *Value) bool {
v.AuxInt = int8ToAuxInt(0)
return true
}
// match: (Sub8 (Neg8 x) (Com8 x))
// result: (Const8 [1])
for {
if v_0.Op != OpNeg8 {
break
}
x := v_0.Args[0]
if v_1.Op != OpCom8 || x != v_1.Args[0] {
break
}
v.reset(OpConst8)
v.AuxInt = int8ToAuxInt(1)
return true
}
// match: (Sub8 (Com8 x) (Neg8 x))
// result: (Const8 [-1])
for {
if v_0.Op != OpCom8 {
break
}
x := v_0.Args[0]
if v_1.Op != OpNeg8 || x != v_1.Args[0] {
break
}
v.reset(OpConst8)
v.AuxInt = int8ToAuxInt(-1)
return true
}
// match: (Sub8 (Add8 x y) x)
// result: y
for {