diff options
Diffstat (limited to 'src/runtime/memmove_plan9_amd64.s')
| -rw-r--r-- | src/runtime/memmove_plan9_amd64.s | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/runtime/memmove_plan9_amd64.s b/src/runtime/memmove_plan9_amd64.s index 8e96b87175..a1cc25567b 100644 --- a/src/runtime/memmove_plan9_amd64.s +++ b/src/runtime/memmove_plan9_amd64.s @@ -43,7 +43,8 @@ tail: CMPQ BX, $4 JBE move_3or4 CMPQ BX, $8 - JBE move_5through8 + JB move_5through7 + JE move_8 CMPQ BX, $16 JBE move_9through16 @@ -113,12 +114,17 @@ move_3or4: MOVW AX, (DI) MOVW CX, -2(DI)(BX*1) RET -move_5through8: +move_5through7: MOVL (SI), AX MOVL -4(SI)(BX*1), CX MOVL AX, (DI) MOVL CX, -4(DI)(BX*1) RET +move_8: + // We need a separate case for 8 to make sure we write pointers atomically. + MOVQ (SI), AX + MOVQ AX, (DI) + RET move_9through16: MOVQ (SI), AX MOVQ -8(SI)(BX*1), CX |