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.
107 lines
1.4 KiB
ArmAsm
107 lines
1.4 KiB
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@NetBSD.org>.
|
|
* Public domain.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS)
|
|
RCSID("$NetBSD: strncmp.S,v 1.3 2005/08/03 22:59:50 rpaulo Exp $")
|
|
#endif
|
|
|
|
/*
|
|
* 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(strncmp)
|
|
testq %rdx,%rdx
|
|
jmp L2 /* Jump into the loop! */
|
|
|
|
L1: incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
L2: jz L4 /* strings are equal */
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
jne L3
|
|
|
|
incq %rdi
|
|
incq %rsi
|
|
decq %rdx
|
|
jz L4
|
|
movb (%rdi),%al
|
|
testb %al,%al
|
|
jz L3
|
|
cmpb %al,(%rsi)
|
|
je L1
|
|
|
|
L3: movzbl (%rdi),%eax /* unsigned comparison */
|
|
movzbl (%rsi),%ecx
|
|
subl %ecx,%eax
|
|
ret
|
|
L4: xorl %eax,%eax
|
|
ret
|