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cmd/compile/internal/ssa: optimize ANDconst rule of loong64

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Change-Id: I0e88f885ff17b4932c2f448dc3c577c0329a6658
Reviewed-on: https://go-review.googlesource.com/c/go/+/620976
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
limeidan 2024-07-06 17:19:06 +08:00 committed by abner chenc
parent 0753396628
commit 4bfc81a727
2 changed files with 15 additions and 0 deletions
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2
src/cmd/compile/internal/ssa/_gen/LOONG64.rules
View File

@ -730,6 +730,8 @@
(MOVWUreg (MOVVconst [c])) => (MOVVconst [int64(uint32(c))])
(MOVVreg (MOVVconst [c])) => (MOVVconst [c])
(MOVBUreg (ANDconst [c] x)) => (ANDconst [c&0xff] x)
// constant comparisons
(SGTconst [c] (MOVVconst [d])) && c>d => (MOVVconst [1])
(SGTconst [c] (MOVVconst [d])) && c<=d => (MOVVconst [0])

13
src/cmd/compile/internal/ssa/rewriteLOONG64.go
View File

@ -1960,6 +1960,19 @@ func rewriteValueLOONG64_OpLOONG64MOVBUreg(v *Value) bool {
v.AuxInt = int64ToAuxInt(int64(uint8(c)))
return true
}
// match: (MOVBUreg (ANDconst [c] x))
// result: (ANDconst [c&0xff] x)
for {
if v_0.Op != OpLOONG64ANDconst {
break
}
c := auxIntToInt64(v_0.AuxInt)
x := v_0.Args[0]
v.reset(OpLOONG64ANDconst)
v.AuxInt = int64ToAuxInt(c & 0xff)
v.AddArg(x)
return true
}
return false
}
func rewriteValueLOONG64_OpLOONG64MOVBload(v *Value) bool {