Subversion Repositories openrisc

#if defined __thumb__ || defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)

#include "../../string/strlen.c"

#else

#include <string.h>

#include "xscale.h"

size_t

strlen (const char *str)

{

  _CONST char *start = str;

  /* Skip unaligned part.  */

  if ((long)str & 3)

    {

      str--;

      do

        {

          if (*++str == '\0')

            goto out;

        }

      while ((long)str & 3);

    }

  /* Load two constants:

     R4 = 0xfefefeff [ == ~(0x80808080 << 1) ]

     R5 = 0x80808080  */

  asm ("mov     r5, #0x80\n\

        add     r5, r5, #0x8000\n\

        add     r5, r5, r5, lsl #16\n\

        mvn     r4, r5, lsl #1\n\

"

#if defined __ARM_ARCH_5__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5E__ || defined __ARM_ARCH_5TE__

"       tst     %0, #0x7\n\

        ldreqd  r6, [%0]\n\

        beq     1f\n\

        ldr     r2, [%0]\n\

        add     r3, r2, r4\n\

        bic     r3, r3, r2\n\

        ands    r2, r3, r5\n\

        bne     2f\n\

        sub     %0, %0, #4\n\

\n\

0:\n\

        ldrd    r6, [%0, #8]!\n\

"

        PRELOADSTR ("%0")

"\n\

1:\n\

        add     r3, r6, r4\n\

        add     r2, r7, r4\n\

        bic     r3, r3, r6\n\

        bic     r2, r2, r7\n\

        and     r3, r3, r5\n\

        and     r2, r2, r5\n\

        orrs    r3, r2, r3\n\

        beq     0b\n\

"

#else

"       sub     %0, %0, #4\n\

\n\

0:\n\

        ldr     r6, [%0, #4]!\n\

"

        PRELOADSTR ("%0")

"\n\

        add     r3, r6, r4\n\

        bic     r3, r3, r6\n\

        ands    r3, r3, r5\n\

        beq     0b\n\

"

#endif /* __ARM_ARCH_5[T][E]__ */

"\n\

2:\n\

        ldrb    r3, [%0]\n\

        cmp     r3, #0x0\n\

        beq     1f\n\

\n\

0:\n\

        ldrb    r3, [%0, #1]!\n\

"

        PRELOADSTR ("%0")

"\n\

        cmp     r3, #0x0\n\

        bne     0b\n\

1:\n\

"

       : "=r" (str) : "0" (str) : "r2", "r3", "r4", "r5", "r6", "r7");

  out:

  return str - start;

}

#endif