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| author | Joel Sing <joel@sing.id.au> | 2026-02-21 03:29:09 +1100 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2026-03-06 14:39:32 -0800 |
| commit | 3a29ebeef985efb12d2b8670f50b146e9a2815ca (patch) | |
| tree | e08894e3c63d59cdff57ccdaf8d71cf4a0505f54 /src/cmd/compile | |
| parent | 426ea5cd22d8de6b1ed909062c624fd1e6e04757 (diff) | |
| download | go-3a29ebeef985efb12d2b8670f50b146e9a2815ca.tar.xz | |
cmd/compile: additional optimisation for CZEROEQZ/CZERONEZ on riscv64
Negation on a condition can be eliminated.
Change-Id: I94fab5f019cbaebb2ca589e1d8796a9cb72f3894
Reviewed-on: https://go-review.googlesource.com/c/go/+/748401
Reviewed-by: Xueqi Luo <1824368278@qq.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Julian Zhu <jz531210@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/cmd/compile')
| -rw-r--r-- | src/cmd/compile/internal/ssa/_gen/RISCV64.rules | 1 | ||||
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteRISCV64.go | 24 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/_gen/RISCV64.rules b/src/cmd/compile/internal/ssa/_gen/RISCV64.rules index 06130d242d..9e3911ea0c 100644 --- a/src/cmd/compile/internal/ssa/_gen/RISCV64.rules +++ b/src/cmd/compile/internal/ssa/_gen/RISCV64.rules @@ -866,6 +866,7 @@ (OR (CZEROEQZ <t> x (MOVBUreg <typ.UInt64> cond)) (CZERONEZ <t> y (MOVBUreg <typ.UInt64> cond))) (CZERO(EQ|NE)Z x (SNEZ y)) => (CZERO(EQ|NE)Z x y) (CZERO(EQ|NE)Z x (SEQZ y)) => (CZERO(NE|EQ)Z x y) +(CZERO(EQ|NE)Z x (NEG y)) => (CZERO(EQ|NE)Z x y) (CZEROEQZ x x) => x (CZERONEZ x x) => (MOVDconst [0]) (CZERO(EQ|NE)Z (MOVDconst [0]) _) => (MOVDconst [0]) diff --git a/src/cmd/compile/internal/ssa/rewriteRISCV64.go b/src/cmd/compile/internal/ssa/rewriteRISCV64.go index 1700604422..d5c52c5eb1 100644 --- a/src/cmd/compile/internal/ssa/rewriteRISCV64.go +++ b/src/cmd/compile/internal/ssa/rewriteRISCV64.go @@ -3588,6 +3588,18 @@ func rewriteValueRISCV64_OpRISCV64CZEROEQZ(v *Value) bool { v.AddArg2(x, y) return true } + // match: (CZEROEQZ x (NEG y)) + // result: (CZEROEQZ x y) + for { + x := v_0 + if v_1.Op != OpRISCV64NEG { + break + } + y := v_1.Args[0] + v.reset(OpRISCV64CZEROEQZ) + v.AddArg2(x, y) + return true + } // match: (CZEROEQZ x x) // result: x for { @@ -3637,6 +3649,18 @@ func rewriteValueRISCV64_OpRISCV64CZERONEZ(v *Value) bool { v.AddArg2(x, y) return true } + // match: (CZERONEZ x (NEG y)) + // result: (CZERONEZ x y) + for { + x := v_0 + if v_1.Op != OpRISCV64NEG { + break + } + y := v_1.Args[0] + v.reset(OpRISCV64CZERONEZ) + v.AddArg2(x, y) + return true + } // match: (CZERONEZ x x) // result: (MOVDconst [0]) for { |