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Save a jmp for memcpy(3).

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This commit is contained in:
junyoung 2002-10-29 07:01:44 +00:00
parent 333f362341
commit 4c3981eea3
1 changed files with 5 additions and 3 deletions
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8
lib/libc/arch/i386/string/bcopy.S
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@ -36,7 +36,7 @@
#include <machine/asm.h> #include <machine/asm.h>
#if defined(LIBC_SCCS) #if defined(LIBC_SCCS)
RCSID("$NetBSD: bcopy.S,v 1.10 2002/10/29 06:53:18 junyoung Exp $") RCSID("$NetBSD: bcopy.S,v 1.11 2002/10/29 07:01:44 junyoung Exp $")
#endif #endif
/* /*
@ -64,13 +64,15 @@ ENTRY(bcopy)
movl 16(%esp),%edi movl 16(%esp),%edi
#endif #endif
movl 20(%esp),%ecx movl 20(%esp),%ecx
#if !defined(MEMCOPY) #if defined(MEMCOPY)
movl %ecx,%edx
#else
movl %edi,%edx movl %edi,%edx
subl %esi,%edx subl %esi,%edx
cmpl %ecx,%edx /* overlapping? */ cmpl %ecx,%edx /* overlapping? */
#endif
movl %ecx,%edx movl %ecx,%edx
jb 1f jb 1f
#endif
cld /* nope, copy forwards. */ cld /* nope, copy forwards. */
shrl $2,%ecx /* copy by words */ shrl $2,%ecx /* copy by words */
rep rep