mirror of
https://github.com/autc04/Retro68.git
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123 lines
1.7 KiB
C
123 lines
1.7 KiB
C
#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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