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cmd/compile: rewrite a & 1 != 1 into a & 1 == 0 on amd64 

These rules trigger 190 times during make.bash.

Change-Id: I20d1688db5d8c904a7237c08635c6c9d8bd58b1c
Reviewed-on: https://go-review.googlesource.com/105037
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
This commit is contained in:
Josh Bleecher Snyder 2018-04-05 10:20:05 -07:00
parent 7818b82fc8
commit 3f483e6520
2 changed files with 299 additions and 44 deletions
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7
src/cmd/compile/internal/ssa/gen/AMD64.rules
View File

@ -684,6 +684,13 @@
(BTLconst [c] (SHLLconst [d] x)) && c>d -> (BTLconst [c-d] x)
(BTLconst [0] s:(SHRL x y)) -> (BTL y x)
// Rewrite a & 1 != 1 into a & 1 == 0.
// Among other things, this lets us turn (a>>b)&1 != 1 into a bit test.
(SET(NE|EQ) (CMPLconst [1] s:(ANDLconst [1] _))) -> (SET(EQ|NE) (CMPLconst [0] s))
(SET(NE|EQ)mem [off] {sym} ptr (CMPLconst [1] s:(ANDLconst [1] _)) mem) -> (SET(EQ|NE)mem [off] {sym} ptr (CMPLconst [0] s) mem)
(SET(NE|EQ) (CMPQconst [1] s:(ANDQconst [1] _))) -> (SET(EQ|NE) (CMPQconst [0] s))
(SET(NE|EQ)mem [off] {sym} ptr (CMPQconst [1] s:(ANDQconst [1] _)) mem) -> (SET(EQ|NE)mem [off] {sym} ptr (CMPQconst [0] s) mem)
// Recognize bit setting (a |= 1<<b) and toggling (a ^= 1<<b)
(OR(Q|L) (SHL(Q|L) (MOV(Q|L)const [1]) y) x) && !config.nacl -> (BTS(Q|L) x y)
(XOR(Q|L) (SHL(Q|L) (MOV(Q|L)const [1]) y) x) && !config.nacl -> (BTC(Q|L) x y)

336
src/cmd/compile/internal/ssa/rewriteAMD64.go
View File

@ -42452,6 +42452,63 @@ func rewriteValueAMD64_OpAMD64SETEQ_0(v *Value) bool {
v.AddArg(v0)
return true
}
// match: (SETEQ (CMPLconst [1] s:(ANDLconst [1] _)))
// cond:
// result: (SETNE (CMPLconst [0] s))
for {
v_0 := v.Args[0]
if v_0.Op != OpAMD64CMPLconst {
break
}
if v_0.AuxInt != 1 {
break
}
s := v_0.Args[0]
if s.Op != OpAMD64ANDLconst {
break
}
if s.AuxInt != 1 {
break
}
v.reset(OpAMD64SETNE)
v0 := b.NewValue0(v.Pos, OpAMD64CMPLconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
return true
}
// match: (SETEQ (CMPQconst [1] s:(ANDQconst [1] _)))
// cond:
// result: (SETNE (CMPQconst [0] s))
for {
v_0 := v.Args[0]
if v_0.Op != OpAMD64CMPQconst {
break
}
if v_0.AuxInt != 1 {
break
}
s := v_0.Args[0]
if s.Op != OpAMD64ANDQconst {
break
}
if s.AuxInt != 1 {
break
}
v.reset(OpAMD64SETNE)
v0 := b.NewValue0(v.Pos, OpAMD64CMPQconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQ_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQ (TESTQ z1:(SHLQconst [63] (SHRQconst [63] x)) z2))
// cond: z1==z2 && !config.nacl
// result: (SETAE (BTQconst [63] x))
@ -42522,13 +42579,6 @@ func rewriteValueAMD64_OpAMD64SETEQ_0(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQ_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQ (TESTL z1:(SHLLconst [31] (SHRQconst [31] x)) z2))
// cond: z1==z2 && !config.nacl
// result: (SETAE (BTQconst [31] x))
@ -42795,6 +42845,13 @@ func rewriteValueAMD64_OpAMD64SETEQ_10(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQ_20(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQ (TESTL z1:(SHRLconst [31] x) z2))
// cond: z1==z2 && !config.nacl
// result: (SETAE (BTLconst [31] x))
@ -42851,9 +42908,6 @@ func rewriteValueAMD64_OpAMD64SETEQ_10(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQ_20(v *Value) bool {
// match: (SETEQ (InvertFlags x))
// cond:
// result: (SETEQ x)
@ -43228,6 +43282,81 @@ func rewriteValueAMD64_OpAMD64SETEQmem_0(v *Value) bool {
v.AddArg(mem)
return true
}
// match: (SETEQmem [off] {sym} ptr (CMPLconst [1] s:(ANDLconst [1] _)) mem)
// cond:
// result: (SETNEmem [off] {sym} ptr (CMPLconst [0] s) mem)
for {
off := v.AuxInt
sym := v.Aux
_ = v.Args[2]
ptr := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpAMD64CMPLconst {
break
}
if v_1.AuxInt != 1 {
break
}
s := v_1.Args[0]
if s.Op != OpAMD64ANDLconst {
break
}
if s.AuxInt != 1 {
break
}
mem := v.Args[2]
v.reset(OpAMD64SETNEmem)
v.AuxInt = off
v.Aux = sym
v.AddArg(ptr)
v0 := b.NewValue0(v.Pos, OpAMD64CMPLconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
v.AddArg(mem)
return true
}
// match: (SETEQmem [off] {sym} ptr (CMPQconst [1] s:(ANDQconst [1] _)) mem)
// cond:
// result: (SETNEmem [off] {sym} ptr (CMPQconst [0] s) mem)
for {
off := v.AuxInt
sym := v.Aux
_ = v.Args[2]
ptr := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpAMD64CMPQconst {
break
}
if v_1.AuxInt != 1 {
break
}
s := v_1.Args[0]
if s.Op != OpAMD64ANDQconst {
break
}
if s.AuxInt != 1 {
break
}
mem := v.Args[2]
v.reset(OpAMD64SETNEmem)
v.AuxInt = off
v.Aux = sym
v.AddArg(ptr)
v0 := b.NewValue0(v.Pos, OpAMD64CMPQconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQmem_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQmem [off] {sym} ptr (TESTQ z1:(SHLQconst [63] (SHRQconst [63] x)) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETAEmem [off] {sym} ptr (BTQconst [63] x) mem)
@ -43316,13 +43445,6 @@ func rewriteValueAMD64_OpAMD64SETEQmem_0(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQmem_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQmem [off] {sym} ptr (TESTL z1:(SHLLconst [31] (SHRLconst [31] x)) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETAEmem [off] {sym} ptr (BTLconst [31] x) mem)
@ -43661,6 +43783,13 @@ func rewriteValueAMD64_OpAMD64SETEQmem_10(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQmem_20(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETEQmem [off] {sym} ptr (TESTL z1:(SHRLconst [31] x) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETAEmem [off] {sym} ptr (BTLconst [31] x) mem)
@ -43735,11 +43864,6 @@ func rewriteValueAMD64_OpAMD64SETEQmem_10(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETEQmem_20(v *Value) bool {
b := v.Block
_ = b
// match: (SETEQmem [off] {sym} ptr (InvertFlags x) mem)
// cond:
// result: (SETEQmem [off] {sym} ptr x mem)
@ -45243,6 +45367,63 @@ func rewriteValueAMD64_OpAMD64SETNE_0(v *Value) bool {
v.AddArg(v0)
return true
}
// match: (SETNE (CMPLconst [1] s:(ANDLconst [1] _)))
// cond:
// result: (SETEQ (CMPLconst [0] s))
for {
v_0 := v.Args[0]
if v_0.Op != OpAMD64CMPLconst {
break
}
if v_0.AuxInt != 1 {
break
}
s := v_0.Args[0]
if s.Op != OpAMD64ANDLconst {
break
}
if s.AuxInt != 1 {
break
}
v.reset(OpAMD64SETEQ)
v0 := b.NewValue0(v.Pos, OpAMD64CMPLconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
return true
}
// match: (SETNE (CMPQconst [1] s:(ANDQconst [1] _)))
// cond:
// result: (SETEQ (CMPQconst [0] s))
for {
v_0 := v.Args[0]
if v_0.Op != OpAMD64CMPQconst {
break
}
if v_0.AuxInt != 1 {
break
}
s := v_0.Args[0]
if s.Op != OpAMD64ANDQconst {
break
}
if s.AuxInt != 1 {
break
}
v.reset(OpAMD64SETEQ)
v0 := b.NewValue0(v.Pos, OpAMD64CMPQconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNE_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNE (TESTQ z1:(SHLQconst [63] (SHRQconst [63] x)) z2))
// cond: z1==z2 && !config.nacl
// result: (SETB (BTQconst [63] x))
@ -45313,13 +45494,6 @@ func rewriteValueAMD64_OpAMD64SETNE_0(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNE_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNE (TESTL z1:(SHLLconst [31] (SHRQconst [31] x)) z2))
// cond: z1==z2 && !config.nacl
// result: (SETB (BTQconst [31] x))
@ -45586,6 +45760,13 @@ func rewriteValueAMD64_OpAMD64SETNE_10(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNE_20(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNE (TESTL z1:(SHRLconst [31] x) z2))
// cond: z1==z2 && !config.nacl
// result: (SETB (BTLconst [31] x))
@ -45642,9 +45823,6 @@ func rewriteValueAMD64_OpAMD64SETNE_10(v *Value) bool {
v.AddArg(v0)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNE_20(v *Value) bool {
// match: (SETNE (InvertFlags x))
// cond:
// result: (SETNE x)
@ -46019,6 +46197,81 @@ func rewriteValueAMD64_OpAMD64SETNEmem_0(v *Value) bool {
v.AddArg(mem)
return true
}
// match: (SETNEmem [off] {sym} ptr (CMPLconst [1] s:(ANDLconst [1] _)) mem)
// cond:
// result: (SETEQmem [off] {sym} ptr (CMPLconst [0] s) mem)
for {
off := v.AuxInt
sym := v.Aux
_ = v.Args[2]
ptr := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpAMD64CMPLconst {
break
}
if v_1.AuxInt != 1 {
break
}
s := v_1.Args[0]
if s.Op != OpAMD64ANDLconst {
break
}
if s.AuxInt != 1 {
break
}
mem := v.Args[2]
v.reset(OpAMD64SETEQmem)
v.AuxInt = off
v.Aux = sym
v.AddArg(ptr)
v0 := b.NewValue0(v.Pos, OpAMD64CMPLconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
v.AddArg(mem)
return true
}
// match: (SETNEmem [off] {sym} ptr (CMPQconst [1] s:(ANDQconst [1] _)) mem)
// cond:
// result: (SETEQmem [off] {sym} ptr (CMPQconst [0] s) mem)
for {
off := v.AuxInt
sym := v.Aux
_ = v.Args[2]
ptr := v.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpAMD64CMPQconst {
break
}
if v_1.AuxInt != 1 {
break
}
s := v_1.Args[0]
if s.Op != OpAMD64ANDQconst {
break
}
if s.AuxInt != 1 {
break
}
mem := v.Args[2]
v.reset(OpAMD64SETEQmem)
v.AuxInt = off
v.Aux = sym
v.AddArg(ptr)
v0 := b.NewValue0(v.Pos, OpAMD64CMPQconst, types.TypeFlags)
v0.AuxInt = 0
v0.AddArg(s)
v.AddArg(v0)
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNEmem_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNEmem [off] {sym} ptr (TESTQ z1:(SHLQconst [63] (SHRQconst [63] x)) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETBmem [off] {sym} ptr (BTQconst [63] x) mem)
@ -46107,13 +46360,6 @@ func rewriteValueAMD64_OpAMD64SETNEmem_0(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNEmem_10(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNEmem [off] {sym} ptr (TESTL z1:(SHLLconst [31] (SHRLconst [31] x)) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETBmem [off] {sym} ptr (BTLconst [31] x) mem)
@ -46452,6 +46698,13 @@ func rewriteValueAMD64_OpAMD64SETNEmem_10(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNEmem_20(v *Value) bool {
b := v.Block
_ = b
config := b.Func.Config
_ = config
// match: (SETNEmem [off] {sym} ptr (TESTL z1:(SHRLconst [31] x) z2) mem)
// cond: z1==z2 && !config.nacl
// result: (SETBmem [off] {sym} ptr (BTLconst [31] x) mem)
@ -46526,11 +46779,6 @@ func rewriteValueAMD64_OpAMD64SETNEmem_10(v *Value) bool {
v.AddArg(mem)
return true
}
return false
}
func rewriteValueAMD64_OpAMD64SETNEmem_20(v *Value) bool {
b := v.Block
_ = b
// match: (SETNEmem [off] {sym} ptr (InvertFlags x) mem)
// cond:
// result: (SETNEmem [off] {sym} ptr x mem)