| /* $OpenBSD: strcmp.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */ |
| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Public domain. |
| */ |
| |
| #include <machine/asm.h> |
| |
| /* |
| * NOTE: I've unrolled the loop eight times: large enough to make a |
| * significant difference, and small enough not to totally trash the |
| * cache. |
| */ |
| |
| ENTRY(strcmp) |
| movl 0x04(%esp),%eax |
| movl 0x08(%esp),%edx |
| jmp L2 /* Jump into the loop! */ |
| |
| .align 2,0x90 |
| L1: incl %eax |
| incl %edx |
| L2: movb (%eax),%cl |
| testb %cl,%cl /* null terminator??? */ |
| jz L3 |
| cmpb %cl,(%edx) /* chars match??? */ |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| jne L3 |
| incl %eax |
| incl %edx |
| movb (%eax),%cl |
| testb %cl,%cl |
| jz L3 |
| cmpb %cl,(%edx) |
| je L1 |
| .align 2, 0x90 |
| L3: movzbl (%eax),%eax /* unsigned comparison */ |
| movzbl (%edx),%edx |
| subl %edx,%eax |
| ret |
| END(strcmp) |
