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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [xscale/] [strchr.c] - Blame information for rev 207

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Line No. Rev Author Line
1 207 jeremybenn
#if defined __thumb__
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#include "../../string/strchr.c"
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#else
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#include <string.h>
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#include "xscale.h"
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char *
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strchr (const char *s, int c)
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{
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  unsigned int c2;
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  asm (PRELOADSTR ("%0") : : "r" (s));
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  c &= 0xff;
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#ifndef __OPTIMIZE_SIZE__
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  /* Skip unaligned part.  */
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  if ((long)s & 3)
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    {
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      s--;
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      do
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        {
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          int c2 = *++s;
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          if (c2 == c)
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            return (char *)s;
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          if (c2 == '\0')
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            return 0;
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        }
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      while (((long)s & 3) != 0);
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    }
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  c2 = c + (c << 8);
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  c2 += c2 << 16;
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  /* Load two constants:
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     R6 = 0xfefefeff [ == ~(0x80808080 << 1) ]
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     R5 = 0x80808080  */
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  asm (PRELOADSTR ("%0") "\n\
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        mov     r5, #0x80\n\
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        add     r5, r5, #0x8000\n\
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        add     r5, r5, r5, lsl #16\n\
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        mvn     r6, r5, lsl #1\n\
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\n\
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        sub     %0, %0, #4\n\
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0:\n\
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        ldr     r1, [%0, #4]!\n\
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"       PRELOADSTR ("%0") "\n\
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        add     r3, r1, r6\n\
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        bic     r3, r3, r1\n\
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        ands    r2, r3, r5\n\
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        bne     1f\n\
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        eor     r2, r1, %1\n\
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        add     r3, r2, r6\n\
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        bic     r3, r3, r2\n\
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        ands    r1, r3, r5\n\
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        beq     0b\n\
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1:"
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       : "=&r" (s)
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       : "r" (c2), "0" (s)
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       : "r1", "r2", "r3", "r5", "r6", "cc");
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#endif
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  while (*s && *s != c)
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    s++;
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  if (*s == c)
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    return (char *)s;
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  return NULL;
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}
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#endif

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