85 lines
1.3 KiB
ArmAsm
85 lines
1.3 KiB
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: strcmp.S,v 1.11 1995/04/28 22:58:10 jtc Exp $")
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#endif
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/*
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* NOTE: I've unrolled the loop eight times: large enough to make a
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* significant difference, and small enough not to totally trash the
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* cache.
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*/
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ENTRY(strcmp)
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movl 0x04(%esp),%eax
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movl 0x08(%esp),%edx
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jmp L2 /* Jump into the loop! */
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.align 2,0x90
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L1: incl %eax
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incl %edx
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L2: movb (%eax),%cl
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testb %cl,%cl /* null terminator??? */
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jz L3
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cmpb %cl,(%edx) /* chars match??? */
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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jne L3
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incl %eax
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incl %edx
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movb (%eax),%cl
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testb %cl,%cl
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jz L3
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cmpb %cl,(%edx)
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je L1
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.align 2, 0x90
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L3: movzbl (%eax),%eax /* unsigned comparison */
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movzbl (%edx),%edx
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subl %edx,%eax
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ret
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