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runtime: simplify amd64 memmove of 3/4 bytes

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Change-Id: I132d3627ae301b68bf87eacb5bf41fd1ba2dcd91
Reviewed-on: https://go-review.googlesource.com/94025
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-11-12 22:11:33 -08:00
parent 8e0b814a3a
commit 910d232a28
1 changed files with 3 additions and 4 deletions
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7
src/runtime/memmove_amd64.s
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@ -48,7 +48,8 @@ tail:
CMPQ BX, $2
JBE move_1or2
CMPQ BX, $4
JBE move_3or4
JB move_3
JBE move_4
CMPQ BX, $8
JB move_5through7
JE move_8
@ -145,9 +146,7 @@ move_1or2:
RET
move_0:
RET
move_3or4:
CMPQ BX, $4
JB move_3
move_4:
MOVL (SI), AX
MOVL AX, (DI)
RET