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| 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/riscv64 | |
| 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/riscv64')
| -rw-r--r-- | src/cmd/compile/internal/riscv64/ssa.go | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/riscv64/ssa.go b/src/cmd/compile/internal/riscv64/ssa.go index d33240351f..2ccd3b2830 100644 --- a/src/cmd/compile/internal/riscv64/ssa.go +++ b/src/cmd/compile/internal/riscv64/ssa.go @@ -228,7 +228,7 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) { gc.AddrAuto(&p.To, v) case ssa.OpSP, ssa.OpSB, ssa.OpGetG: // nothing to do - case ssa.OpRISCV64ADD, ssa.OpRISCV64SUB, ssa.OpRISCV64XOR, ssa.OpRISCV64OR, ssa.OpRISCV64AND, + case ssa.OpRISCV64ADD, ssa.OpRISCV64SUB, ssa.OpRISCV64SUBW, ssa.OpRISCV64XOR, ssa.OpRISCV64OR, ssa.OpRISCV64AND, ssa.OpRISCV64SLL, ssa.OpRISCV64SRA, ssa.OpRISCV64SRL, ssa.OpRISCV64SLT, ssa.OpRISCV64SLTU, ssa.OpRISCV64MUL, ssa.OpRISCV64MULW, ssa.OpRISCV64MULH, ssa.OpRISCV64MULHU, ssa.OpRISCV64DIV, ssa.OpRISCV64DIVU, ssa.OpRISCV64DIVW, |