diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-02-01 10:31:41 +0100 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-02-01 10:31:41 +0100 |
| commit | ed9e9f98e9cc502c72b27c68612e9e187ec11e10 (patch) | |
| tree | 42901d0156503dadce4bf1f0b60e9ef850c3c5e0 /sys/src/ape/lib/ap/amd64/strchr.s | |
| parent | d4fb753c9c90e0ca745a1b3708ad3ec4ca523e71 (diff) | |
libc and ape support for amd64
Diffstat (limited to 'sys/src/ape/lib/ap/amd64/strchr.s')
| -rw-r--r-- | sys/src/ape/lib/ap/amd64/strchr.s | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sys/src/ape/lib/ap/amd64/strchr.s b/sys/src/ape/lib/ap/amd64/strchr.s new file mode 100644 index 000000000..317537361 --- /dev/null +++ b/sys/src/ape/lib/ap/amd64/strchr.s @@ -0,0 +1,38 @@ + TEXT strchr(SB), $0 + + MOVQ RARG, DI + MOVB c+8(FP), AX + CMPB AX, $0 + JEQ l2 /**/ + +/* + * char is not null + */ +l1: + MOVB (DI), BX + CMPB BX, $0 + JEQ ret0 + ADDQ $1, DI + CMPB AX, BX + JNE l1 + + MOVQ DI, AX + SUBQ $1, AX + RET + +/* + * char is null + */ +l2: + MOVQ $-1, CX + CLD + + REPN; SCASB + + MOVQ DI, AX + SUBQ $1, AX + RET + +ret0: + MOVQ $0, AX + RET |