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- /* $OpenBSD: strcmp.S,v 1.2 1996/09/27 06:47:49 mickey 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
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