diff options
Diffstat (limited to 'src/pkg/runtime/amd64/memmove.s')
| -rw-r--r-- | src/pkg/runtime/amd64/memmove.s | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/pkg/runtime/amd64/memmove.s b/src/pkg/runtime/amd64/memmove.s index 9966b0ba7..fc9573f72 100644 --- a/src/pkg/runtime/amd64/memmove.s +++ b/src/pkg/runtime/amd64/memmove.s @@ -33,7 +33,6 @@ TEXT runtime·memmove(SB), 7, $0 /* * check and set for backwards - * should we look closer for overlap? */ CMPQ SI, DI JLS back @@ -41,6 +40,7 @@ TEXT runtime·memmove(SB), 7, $0 /* * forward copy loop */ +forward: MOVQ BX, CX SHRQ $3, CX ANDQ $7, BX @@ -51,11 +51,19 @@ TEXT runtime·memmove(SB), 7, $0 MOVQ to+0(FP),AX RET +back: +/* + * check overlap + */ + MOVQ SI, CX + ADDQ BX, CX + CMPQ CX, DI + JLS forward + /* * whole thing backwards has * adjusted addresses */ -back: ADDQ BX, DI ADDQ BX, SI STD |