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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [xscale/] [memmove.c] - Blame information for rev 407

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Line No. Rev Author Line
1 148 jeremybenn 
#if defined __thumb__
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#include "../../string/memmove.c"
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#else
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#include <string.h>
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#include "xscale.h"
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static inline void *
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do_memcpy (void *dst0, const void *src0, size_t len)
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{
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  int dummy;
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  asm volatile (
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#ifndef __OPTIMIZE_SIZE__
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       "cmp     %2, #0x3\n\
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        bls     3f\n\
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        and     lr, %1, #0x3\n\
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        and     r3, %0, #0x3\n\
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        cmp     lr, r3\n\
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        bne     3f\n\
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        cmp     lr, #0x0\n\
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        beq     2f\n\
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        b       1f\n\
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0:\n\
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        ldrb    r3, [%1], #1\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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        tst     %1, #0x3\n\
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        strb    r3, [%0], #1\n\
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        beq     3f\n\
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1:\n\
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        sub     %2, %2, #1\n\
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        cmn     %2, #1\n\
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        bne     0b\n\
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2:\n\
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        cmp     %2, #0xf\n\
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        bls     1f\n\
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0:\n\
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        ldmia   %1!, { r3, r4, r5, lr }\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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\n\
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        sub     %2, %2, #16\n\
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        cmp     %2, #0xf\n\
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        stmia   %0!, { r3, r4, r5, lr }\n\
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        bhi     0b\n\
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1:\n\
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        cmp     %2, #0x7\n\
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        bls     1f\n\
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0:\n\
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        ldmia   %1!, { r3, r4 }\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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\n\
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        sub     %2, %2, #8\n\
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        cmp     %2, #0x7\n\
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        stmia   %0!, { r3, r4 }\n\
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        bhi     0b\n\
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1:\n\
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        cmp     %2, #0x3\n\
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        bls     3f\n\
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0:\n\
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        sub     %2, %2, #4\n\
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        ldr     r3, [%1], #4\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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\n\
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        cmp     %2, #0x3\n\
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        str     r3, [%0], #4\n\
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        bhi     0b\n\
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"
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#endif /* !__OPTIMIZE_SIZE__ */
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"\n\
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3:\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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        sub     %2, %2, #1\n\
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        cmn     %2, #1\n\
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        beq     1f\n\
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0:\n\
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        sub     %2, %2, #1\n\
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        ldrb    r3, [%1], #1\n\
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"
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        PRELOADSTR ("%1")
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"\n\
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        cmn     %2, #1\n\
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        strb    r3, [%0], #1\n\
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        bne     0b\n\
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1:"
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       : "=&r" (dummy), "=&r" (src0), "=&r" (len)
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       : "0" (dst0), "1" (src0), "2" (len)
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       : "memory", "lr", "r3", "r4", "r5", "cc");
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  return dst0;
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}
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void *
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memmove (void *dst, const void *src, size_t len)
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{
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  char *d = dst;
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  const char *s = src;
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  if (s < d && d < s + len)
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    {
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      /* Destructive overlap...have to copy backwards.  */
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      s += len;
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      d += len;
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      while (len--)
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        *--d = *--s;
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      return dst;
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    }
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  else
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    return do_memcpy (dst, src, len);
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}
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#endif

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