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

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>
golang · Oct 22, 2024 · 4bfc81a · 4bfc81a
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diff --git a/src/cmd/compile/internal/ssa/_gen/LOONG64.rules b/src/cmd/compile/internal/ssa/_gen/LOONG64.rules
@@ -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])

diff --git a/src/cmd/compile/internal/ssa/rewriteLOONG64.go b/src/cmd/compile/internal/ssa/rewriteLOONG64.go