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/arm/strcmp.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/libc/arm/strcmp.s')
| -rwxr-xr-x | sys/src/libc/arm/strcmp.s | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sys/src/libc/arm/strcmp.s b/sys/src/libc/arm/strcmp.s new file mode 100755 index 000000000..015e51596 --- /dev/null +++ b/sys/src/libc/arm/strcmp.s @@ -0,0 +1,67 @@ +TEXT strcmp(SB), $-4 + MOVW R0, R1 + MOVW s2+4(FP), R2 + + MOVW $0xFF, R3 /* mask */ + +_align: /* align s1 on 4 */ + TST $3, R1 + BEQ _aligned + + MOVBU.P 1(R1), R4 /* implicit write back */ + MOVBU.P 1(R2), R8 /* implicit write back */ + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + B _align + +_aligned: /* is s2 now aligned? */ + TST $3, R2 + BNE _unaligned + +_aloop: + MOVW.P 4(R1), R5 /* 4 at a time */ + MOVW.P 4(R2), R7 + + AND R5, R3, R4 + AND R7, R3, R8 + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + + AND R5>>8, R3, R4 + AND R7>>8, R3, R8 + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + + AND R5>>16, R3, R4 + AND R7>>16, R3, R8 + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + + AND R5>>24, R3, R4 + AND R7>>24, R3, R8 + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + + B _aloop + +_return: + RET + +_unaligned: + MOVBU.P 1(R1), R4 /* implicit write back */ + MOVBU.P 1(R2), R8 /* implicit write back */ + SUB.S R8, R4, R0 + BNE _return + CMP $0, R4 + BEQ _return + B _unaligned |