b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
78 lines
1.1 KiB
ArmAsm
78 lines
1.1 KiB
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@acorntoolworks.com>
|
|
* Public domain.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS)
|
|
RCSID("$NetBSD: strcmp.S,v 1.1 2005/12/20 19:28:49 christos Exp $")
|
|
#endif
|
|
|
|
ENTRY(strcmp)
|
|
pushl %esi
|
|
pushl %ebx
|
|
movl 12(%esp),%ebx
|
|
movl 16(%esp),%esi
|
|
|
|
/*
|
|
* Align s1 to word boundary.
|
|
* Consider unrolling loop?
|
|
*/
|
|
.Ls1align:
|
|
testb $3,%bl
|
|
je .Ls1aligned
|
|
movb (%ebx),%al
|
|
incl %ebx
|
|
movb (%esi),%dl
|
|
incl %esi
|
|
testb %al,%al
|
|
je .Ldone
|
|
cmpb %al,%dl
|
|
je .Ls1align
|
|
jmp .Ldone
|
|
|
|
/*
|
|
* Check whether s2 is aligned to a word boundary. If it is, we
|
|
* can compare by words. Otherwise we have to compare by bytes.
|
|
*/
|
|
.Ls1aligned:
|
|
testl $3,%esi
|
|
jne .Lbyte_loop
|
|
|
|
subl $4,%ebx
|
|
subl $4,%esi
|
|
|
|
_ALIGN_TEXT
|
|
.Lword_loop:
|
|
movl 4(%ebx),%eax
|
|
addl $4,%ebx
|
|
movl 4(%esi),%edx
|
|
addl $4,%esi
|
|
cmpl %eax,%edx
|
|
jne .Lbyte_loop
|
|
subl $0x01010101,%edx
|
|
notl %eax
|
|
andl %eax,%edx
|
|
testl $0x80808080,%edx
|
|
je .Lword_loop
|
|
|
|
_ALIGN_TEXT
|
|
.Lbyte_loop:
|
|
movb (%ebx),%al
|
|
incl %ebx
|
|
movb (%esi),%dl
|
|
incl %esi
|
|
testb %al,%al
|
|
je .Ldone
|
|
cmpb %al,%dl
|
|
je .Lbyte_loop
|
|
|
|
.Ldone:
|
|
movzbl %al,%eax
|
|
movzbl %dl,%edx
|
|
subl %edx,%eax
|
|
popl %ebx
|
|
popl %esi
|
|
ret
|