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math: ARM assembly implementation for Abs

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Obtained on 700MHz OMAP4460:
benchmark       old ns/op    new ns/op    delta
BenchmarkAbs           61           23  -61.63%

R=dave, remyoudompheng, mtj, rsc
CC=golang-dev
https://golang.org/cl/6094047
This commit is contained in:
Shenghou Ma 2012-04-23 23:47:36 +08:00
parent a8098cbcfd
commit e7e7b1c55c
1 changed files with 6 additions and 1 deletions
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7
src/pkg/math/abs_arm.s
View File

@ -3,4 +3,9 @@
// license that can be found in the LICENSE file.
TEXT ·Abs(SB),7,$0
B ·abs(SB)
MOVW lo+0(FP), R0
MOVW hi+4(FP), R1
AND $((1<<31)-1), R1
MOVW R0, resultlo+8(FP)
MOVW R1, resulthi+12(FP)
RET