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| author | Keith Randall <khr@golang.org> | 2025-11-17 22:40:26 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2025-11-18 09:31:58 -0800 |
| commit | ba634ca5c7f19105c853db5752cc0f6d3ca76e45 (patch) | |
| tree | c3d7685b0e82b214764e560dae42f2fdb4bf00dc /src/cmd | |
| parent | 8806d53c106ba9d797a4383b2a49418c509a42c2 (diff) | |
| download | go-ba634ca5c7f19105c853db5752cc0f6d3ca76e45.tar.xz | |
cmd/compile: fold boolean NOT into branches
Gets rid of an EOR $1 instruction.
Change-Id: Ib032b0cee9ac484329c978af9b1305446f8d5dac
Reviewed-on: https://go-review.googlesource.com/c/go/+/721501
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Diffstat (limited to 'src/cmd')
| -rw-r--r-- | src/cmd/compile/internal/ssa/_gen/ARM64.rules | 2 | ||||
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteARM64.go | 31 |
2 files changed, 33 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/_gen/ARM64.rules b/src/cmd/compile/internal/ssa/_gen/ARM64.rules index 04f43f3137..53bb35d289 100644 --- a/src/cmd/compile/internal/ssa/_gen/ARM64.rules +++ b/src/cmd/compile/internal/ssa/_gen/ARM64.rules @@ -573,6 +573,8 @@ (TBNZ [0] (GreaterThanF cc) yes no) => (FGT cc yes no) (TBNZ [0] (GreaterEqualF cc) yes no) => (FGE cc yes no) +(TB(Z|NZ) [0] (XORconst [1] x) yes no) => (TB(NZ|Z) [0] x yes no) + ((EQ|NE|LT|LE|GT|GE) (CMPconst [0] z:(AND x y)) yes no) && z.Uses == 1 => ((EQ|NE|LT|LE|GT|GE) (TST x y) yes no) ((EQ|NE|LT|LE|GT|GE) (CMPconst [0] x:(ANDconst [c] y)) yes no) && x.Uses == 1 => ((EQ|NE|LT|LE|GT|GE) (TSTconst [c] y) yes no) ((EQ|NE|LT|LE|GT|GE) (CMPWconst [0] z:(AND x y)) yes no) && z.Uses == 1 => ((EQ|NE|LT|LE|GT|GE) (TSTW x y) yes no) diff --git a/src/cmd/compile/internal/ssa/rewriteARM64.go b/src/cmd/compile/internal/ssa/rewriteARM64.go index 6137ec13a0..b3f790dbda 100644 --- a/src/cmd/compile/internal/ssa/rewriteARM64.go +++ b/src/cmd/compile/internal/ssa/rewriteARM64.go @@ -25321,6 +25321,37 @@ func rewriteBlockARM64(b *Block) bool { b.resetWithControl(BlockARM64FGE, cc) return true } + // match: (TBNZ [0] (XORconst [1] x) yes no) + // result: (TBZ [0] x yes no) + for b.Controls[0].Op == OpARM64XORconst { + v_0 := b.Controls[0] + if auxIntToInt64(v_0.AuxInt) != 1 { + break + } + x := v_0.Args[0] + if auxIntToInt64(b.AuxInt) != 0 { + break + } + b.resetWithControl(BlockARM64TBZ, x) + b.AuxInt = int64ToAuxInt(0) + return true + } + case BlockARM64TBZ: + // match: (TBZ [0] (XORconst [1] x) yes no) + // result: (TBNZ [0] x yes no) + for b.Controls[0].Op == OpARM64XORconst { + v_0 := b.Controls[0] + if auxIntToInt64(v_0.AuxInt) != 1 { + break + } + x := v_0.Args[0] + if auxIntToInt64(b.AuxInt) != 0 { + break + } + b.resetWithControl(BlockARM64TBNZ, x) + b.AuxInt = int64ToAuxInt(0) + return true + } case BlockARM64UGE: // match: (UGE (FlagConstant [fc]) yes no) // cond: fc.uge() |