projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| f4a040fe PA |
1 | /* |
| 2 | * $NetBSD: bcmp.S,v 1.1 2001/06/19 00:25:04 fvdl Exp $ | |
| 3 | * $FreeBSD: src/lib/libc/amd64/string/bcmp.S,v 1.3 2008/11/02 01:10:54 peter Exp $ | |
| 4 | */ | |
| 5 | ||
| 6 | #include <machine/asm.h> | |
| 7 | ||
| 8 | ENTRY(bcmp) | |
| 9 | cld /* set compare direction forward */ | |
| 10 | ||
| 11 | movq %rdx,%rcx /* compare by words */ | |
| 12 | shrq $3,%rcx | |
| 13 | repe | |
| 14 | cmpsq | |
| 15 | jne L1 | |
| 16 | ||
| 17 | movq %rdx,%rcx /* compare remainder by bytes */ | |
| 18 | andq $7,%rcx | |
| 19 | repe | |
| 20 | cmpsb | |
| 21 | L1: | |
| 22 | setne %al | |
| 23 | movsbl %al,%eax | |
| 24 | ret | |
| 25 | END(bcmp) |