diff options
| author | Joel Sing <joel@sing.id.au> | 2020-02-26 03:58:59 +1100 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2020-02-26 17:59:57 +0000 |
| commit | c27dd0c9e581edb71c834e161db6a920ca239997 (patch) | |
| tree | 8aec1a1484bf4c31e853a7c2db9f5a3b80c4f8f9 /src/cmd/compile/internal/ssa/gen/RISCV64.rules | |
| parent | a1103dcc27b9c85800624367ebb89ef46d4307af (diff) | |
| download | go-c27dd0c9e581edb71c834e161db6a920ca239997.tar.gz go-c27dd0c9e581edb71c834e161db6a920ca239997.zip | |
cmd/compile: improve Eq32/Neq32 on riscv64
Use SUBW to perform a 32-bit subtraction, rather than zero extending from
32 to 64 bits. This reduces Eq32 and Neq32 to two instructions, rather than
the four instructions required previously.
Change-Id: Ib2798324881e9db842c864e91a0c1b1e48c4b67b
Reviewed-on: https://go-review.googlesource.com/c/go/+/220921
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/RISCV64.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/RISCV64.rules | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/RISCV64.rules b/src/cmd/compile/internal/ssa/gen/RISCV64.rules index 711f904f0d..1ffb9575e0 100644 --- a/src/cmd/compile/internal/ssa/gen/RISCV64.rules +++ b/src/cmd/compile/internal/ssa/gen/RISCV64.rules @@ -267,7 +267,7 @@ (EqPtr x y) -> (SEQZ (SUB <x.Type> x y)) (Eq64 x y) -> (SEQZ (SUB <x.Type> x y)) -(Eq32 x y) -> (SEQZ (ZeroExt32to64 (SUB <x.Type> x y))) +(Eq32 x y) -> (SEQZ (SUBW <x.Type> x y)) (Eq16 x y) -> (SEQZ (ZeroExt16to64 (SUB <x.Type> x y))) (Eq8 x y) -> (SEQZ (ZeroExt8to64 (SUB <x.Type> x y))) (Eq64F ...) -> (FEQD ...) @@ -275,7 +275,7 @@ (NeqPtr x y) -> (SNEZ (SUB <x.Type> x y)) (Neq64 x y) -> (SNEZ (SUB <x.Type> x y)) -(Neq32 x y) -> (SNEZ (ZeroExt32to64 (SUB <x.Type> x y))) +(Neq32 x y) -> (SNEZ (SUBW <x.Type> x y)) (Neq16 x y) -> (SNEZ (ZeroExt16to64 (SUB <x.Type> x y))) (Neq8 x y) -> (SNEZ (ZeroExt8to64 (SUB <x.Type> x y))) (Neq64F ...) -> (FNED ...) |