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| author | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
|---|---|---|
| committer | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
| commit | e5888a1ffdae813d7575f5fb02275c6bb07e5199 (patch) | |
| tree | d8d51eac403f07814b9e936eed0c9a79195e2450 /sys/src/libc/386/memset.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/libc/386/memset.s')
| -rwxr-xr-x | sys/src/libc/386/memset.s | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sys/src/libc/386/memset.s b/sys/src/libc/386/memset.s new file mode 100755 index 000000000..6e482abee --- /dev/null +++ b/sys/src/libc/386/memset.s @@ -0,0 +1,35 @@ + TEXT memset(SB),$0 + + CLD + MOVL p+0(FP), DI + MOVBLZX c+4(FP), AX + MOVL n+8(FP), BX +/* + * if not enough bytes, just set bytes + */ + CMPL BX, $9 + JLS c3 +/* + * build word in AX + */ + MOVB AL, AH + MOVL AX, CX + SHLL $16, CX + ORL CX, AX +/* + * set whole longs + */ +c1: + MOVL BX, CX + SHRL $2, CX + ANDL $3, BX + REP; STOSL +/* + * set the rest, by bytes + */ +c3: + MOVL BX, CX + REP; STOSB +ret: + MOVL p+0(FP),AX + RET |