Subversion Repositories openrisc

#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