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/*
* Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd.
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
* in this tarball.
*/
#include <endian.h>
#include "macro.S"
#ifdef WANT_WIDE
# define Wstrcmp wcscmp
# define Wstrcoll wcscoll
#else
# define Wstrcmp strcmp
# define Wstrcoll strcoll
#endif
/* FIXME attention!!! it may be a bug when WANT_WIDE define */
/*libc_hidden_proto(Wstrcmp)*/
.align 2
.global Wstrcmp
.type Wstrcmp, @function
Wstrcmp:
mov a3, a0
or a0, a1
andi a0, 0x3
M_BNEZ a0, 4f
1: // if aligned, load word each time.
ldw a0, (a3, 0)
ldw t0, (a1, 0)
M_BNE a0, t0, 1f // if d[i] != s[i], goto 1f
tstnbz a0 // if d[i] == s[i], check if d or s is at the end.
bf 3f // if at the end, goto 3f (finish comparing)
ldw a0, (a3, 4)
ldw t0, (a1, 4)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 8)
ldw t0, (a1, 8)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 12)
ldw t0, (a1, 12)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 16)
ldw t0, (a1, 16)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 20)
ldw t0, (a1, 20)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 24)
ldw t0, (a1, 24)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
ldw a0, (a3, 28)
ldw t0, (a1, 28)
M_BNE a0, t0, 1f
tstnbz a0
bf 3f
addi a3, 32
addi a1, 32
br 1b
#ifdef __CSKYBE__
/* d[i] != s[i] in word, so we check byte 0 ? */
1:
xtrb0 t1, a0
mov a2, t1
xtrb0 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb1 t1, a0
mov a2, t1
xtrb1 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb2 t1, a0
mov a2, t1
xtrb2 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb3 t1, a0
mov a2, t1
xtrb3 t1, t0
#else /* little endian */
/* d[i] != s[i] in word, so we check byte 0 ? */
1:
xtrb3 t1, a0
mov a2, t1
xtrb3 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb2 t1, a0
mov a2, t1
xtrb2 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb1 t1, a0
mov a2, t1
xtrb1 t1, t0
M_BNE a2, t1, 2f
cmpnei a2, 0
bf 2f
/* d[i] != s[i] in word, so we check byte 1 ? */
xtrb0 t1, a0
mov a2, t1
xtrb0 t1, t0
#endif
/* get the result when d[i] != s[i] */
2:
subu a2, t1
mov a0, a2
jmp r15
/* return when d[i] == s[i] */
3:
subu a0, t0
jmp r15
/* cmp when d or s is not aligned */
4:
ldb a0, (a3,0)
ldb t0, (a1, 0)
M_BNE a0, t0, 3b
addi a1, 1
addi a3, 1
M_BNEZ a0, 4b
jmp r15
.size Wstrcmp, .-Wstrcmp
libc_hidden_def(Wstrcmp)
.weak Wstrcmp
#ifndef __UCLIBC_HAS_LOCALE__
/* libc_hidden_proto(Wstrcoll) */
strong_alias(Wstrcmp,Wstrcoll)
libc_hidden_def(Wstrcoll)
#endif
|
