mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 23:32:06 +00:00
74 lines
1.1 KiB
C
74 lines
1.1 KiB
C
|
#if defined __thumb__
|
||
|
|
|
||
|
|
#include "../../string/strchr.c"
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include "xscale.h"
|
||
|
|
|
||
|
|
char *
|
||
|
|
strchr (const char *s, int c)
|
||
|
|
{
|
||
|
|
unsigned int c2;
|
||
|
|
asm (PRELOADSTR ("%0") : : "r" (s));
|
||
|
|
|
||
|
|
c &= 0xff;
|
||
|
|
|
||
|
|
#ifndef __OPTIMIZE_SIZE__
|
||
|
|
/* Skip unaligned part. */
|
||
|
|
if ((long)s & 3)
|
||
|
|
{
|
||
|
|
s--;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
int c2 = *++s;
|
||
|
|
if (c2 == c)
|
||
|
|
return (char *)s;
|
||
|
|
if (c2 == '\0')
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
while (((long)s & 3) != 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
c2 = c + (c << 8);
|
||
|
|
c2 += c2 << 16;
|
||
|
|
|
||
|
|
/* Load two constants:
|
||
|
|
R6 = 0xfefefeff [ == ~(0x80808080 << 1) ]
|
||
|
|
R5 = 0x80808080 */
|
||
|
|
|
||
|
|
asm (PRELOADSTR ("%0") "\n\
|
||
|
|
mov r5, #0x80\n\
|
||
|
|
add r5, r5, #0x8000\n\
|
||
|
|
add r5, r5, r5, lsl #16\n\
|
||
|
|
mvn r6, r5, lsl #1\n\
|
||
|
|
\n\
|
||
|
|
sub %0, %0, #4\n\
|
||
|
|
0:\n\
|
||
|
|
ldr r1, [%0, #4]!\n\
|
||
|
|
" PRELOADSTR ("%0") "\n\
|
||
|
|
add r3, r1, r6\n\
|
||
|
|
bic r3, r3, r1\n\
|
||
|
|
ands r2, r3, r5\n\
|
||
|
|
bne 1f\n\
|
||
|
|
eor r2, r1, %1\n\
|
||
|
|
add r3, r2, r6\n\
|
||
|
|
bic r3, r3, r2\n\
|
||
|
|
ands r1, r3, r5\n\
|
||
|
|
beq 0b\n\
|
||
|
|
1:"
|
||
|
|
: "=&r" (s)
|
||
|
|
: "r" (c2), "0" (s)
|
||
|
|
: "r1", "r2", "r3", "r5", "r6", "cc");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
while (*s && *s != c)
|
||
|
|
s++;
|
||
|
|
if (*s == c)
|
||
|
|
return (char *)s;
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|