diff options
| 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/mips/strchr.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/libc/mips/strchr.s')
| -rwxr-xr-x | sys/src/libc/mips/strchr.s | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/sys/src/libc/mips/strchr.s b/sys/src/libc/mips/strchr.s new file mode 100755 index 000000000..e009ffad2 --- /dev/null +++ b/sys/src/libc/mips/strchr.s @@ -0,0 +1,63 @@ + TEXT strchr(SB), $0 +MOVW R1, 0(FP) + MOVB c+7(FP), R4 + MOVW s+0(FP), R3 + + BEQ R4, l2 + +/* + * char is not null + */ +l1: + MOVB (R3), R1 + ADDU $1, R3 + BEQ R1, ret + BNE R1,R4, l1 + JMP rm1 + +/* + * char is null + * align to word + */ +l2: + AND $3,R3, R1 + BEQ R1, l3 + MOVB (R3), R1 + ADDU $1, R3 + BNE R1, l2 + JMP rm1 + +l3: + MOVW $0xff000000, R6 + MOVW $0x00ff0000, R7 + +l4: + MOVW (R3), R5 + ADDU $4, R3 + AND R6,R5, R1 + AND R7,R5, R2 + BEQ R1, b0 + AND $0xff00,R5, R1 + BEQ R2, b1 + AND $0xff,R5, R2 + BEQ R1, b2 + BNE R2, l4 + +rm1: + ADDU $-1,R3, R1 + JMP ret + +b2: + ADDU $-2,R3, R1 + JMP ret + +b1: + ADDU $-3,R3, R1 + JMP ret + +b0: + ADDU $-4,R3, R1 + JMP ret + +ret: + RET |