diff options
| author | Keith Randall <khr@golang.org> | 2025-11-17 12:47:04 -0800 |
|---|---|---|
| committer | Keith Randall <khr@google.com> | 2025-11-17 13:45:54 -0800 |
| commit | e1a12c781f55da85a30fd63471f8adcba908acd2 (patch) | |
| tree | 6056b5eaf267ce0432b16e0234811ce40a38bf61 /src/cmd/compile | |
| parent | 6caab99026a496107e903469d8c906be66a71896 (diff) | |
| download | go-e1a12c781f55da85a30fd63471f8adcba908acd2.tar.xz | |
cmd/compile: use 32x32->64 multiplies on arm64
Gets rid of some sign extensions.
Change-Id: Ie67ef36b4ca1cd1a2cd9fa5d84578db553578a22
Reviewed-on: https://go-review.googlesource.com/c/go/+/721241
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/compile')
| -rw-r--r-- | src/cmd/compile/internal/ssa/_gen/ARM64.rules | 4 | ||||
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewriteARM64.go | 48 |
2 files changed, 52 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/_gen/ARM64.rules b/src/cmd/compile/internal/ssa/_gen/ARM64.rules index f54a692725..04f43f3137 100644 --- a/src/cmd/compile/internal/ssa/_gen/ARM64.rules +++ b/src/cmd/compile/internal/ssa/_gen/ARM64.rules @@ -1814,3 +1814,7 @@ (Select0 (Mul64uover x y)) => (MUL x y) (Select1 (Mul64uover x y)) => (NotEqual (CMPconst (UMULH <typ.UInt64> x y) [0])) + +// 32 mul 32 -> 64 +(MUL r:(MOVWUreg x) s:(MOVWUreg y)) && r.Uses == 1 && s.Uses == 1 => (UMULL x y) +(MUL r:(MOVWreg x) s:(MOVWreg y)) && r.Uses == 1 && s.Uses == 1 => (MULL x y) diff --git a/src/cmd/compile/internal/ssa/rewriteARM64.go b/src/cmd/compile/internal/ssa/rewriteARM64.go index 6af1558833..6137ec13a0 100644 --- a/src/cmd/compile/internal/ssa/rewriteARM64.go +++ b/src/cmd/compile/internal/ssa/rewriteARM64.go @@ -12556,6 +12556,54 @@ func rewriteValueARM64_OpARM64MUL(v *Value) bool { } break } + // match: (MUL r:(MOVWUreg x) s:(MOVWUreg y)) + // cond: r.Uses == 1 && s.Uses == 1 + // result: (UMULL x y) + for { + for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 { + r := v_0 + if r.Op != OpARM64MOVWUreg { + continue + } + x := r.Args[0] + s := v_1 + if s.Op != OpARM64MOVWUreg { + continue + } + y := s.Args[0] + if !(r.Uses == 1 && s.Uses == 1) { + continue + } + v.reset(OpARM64UMULL) + v.AddArg2(x, y) + return true + } + break + } + // match: (MUL r:(MOVWreg x) s:(MOVWreg y)) + // cond: r.Uses == 1 && s.Uses == 1 + // result: (MULL x y) + for { + for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 { + r := v_0 + if r.Op != OpARM64MOVWreg { + continue + } + x := r.Args[0] + s := v_1 + if s.Op != OpARM64MOVWreg { + continue + } + y := s.Args[0] + if !(r.Uses == 1 && s.Uses == 1) { + continue + } + v.reset(OpARM64MULL) + v.AddArg2(x, y) + return true + } + break + } return false } func rewriteValueARM64_OpARM64MULW(v *Value) bool { |