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| author | Josh Bleecher Snyder <josharian@gmail.com> | 2019-03-19 12:26:22 -0700 |
|---|---|---|
| committer | Josh Bleecher Snyder <josharian@gmail.com> | 2019-03-19 19:44:52 +0000 |
| commit | 250b96a7bfa5b9ac0f31e70e768173f57a61d2f7 (patch) | |
| tree | 105be22ff285df0d1f5b40819b69a1b3844d3285 /test/codegen/arithmetic.go | |
| parent | fc1e6915dc04aeb95c2f736f8c8805ba6a696c30 (diff) | |
| download | go-git-250b96a7bfa5b9ac0f31e70e768173f57a61d2f7.tar.gz | |
cmd/compile: slightly optimize adding 128
'SUBQ $-0x80, r' is shorter to encode than 'ADDQ $0x80, r',
and functionally equivalent. Use it instead.
Shaves off a few bytes here and there:
file before after Δ %
compile 25935856 25927664 -8192 -0.032%
nm 4251840 4247744 -4096 -0.096%
Change-Id: Ia9e02ea38cbded6a52a613b92e3a914f878d931e
Reviewed-on: https://go-review.googlesource.com/c/go/+/168344
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'test/codegen/arithmetic.go')
| -rw-r--r-- | test/codegen/arithmetic.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/test/codegen/arithmetic.go b/test/codegen/arithmetic.go index 16d7d25d3e..b5976be9d2 100644 --- a/test/codegen/arithmetic.go +++ b/test/codegen/arithmetic.go @@ -381,3 +381,13 @@ func MULS(a, b, c uint32) (uint32, uint32, uint32) { r2 := c - b*64 return r0, r1, r2 } + +func addSpecial(a, b, c uint32) (uint32, uint32, uint32) { + // amd64:`INCL` + a++ + // amd64:`DECL` + b-- + // amd64:`SUBL.*-128` + c += 128 + return a, b, c +} |