mirror of
https://github.com/autc04/Retro68.git
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63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
#if defined __thumb__
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#include "../../string/strcpy.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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strcpy (char *dest, const char *src)
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{
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char *dest0 = dest;
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asm (PRELOADSTR ("%0") : : "r" (src));
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#ifndef __OPTIMIZE_SIZE__
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if (((long)src & 3) == ((long)dest & 3))
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{
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/* Skip unaligned part. */
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while ((long)src & 3)
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{
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if (! (*dest++ = *src++))
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return dest0;
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}
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/* Load two constants:
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R4 = 0xfefefeff [ == ~(0x80808080 << 1) ]
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R5 = 0x80808080 */
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asm ("mov r5, #0x80\n\
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ldr r1, [%1, #0]\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 r4, r5, lsl #1\n\
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\n\
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add r3, r1, r5\n\
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bic r3, r3, r1\n\
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ands r2, r3, r4\n\
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bne 1f\n\
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0:\n\
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ldr r3, [%1, #0]\n\
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ldr r1, [%1, #4]!\n\
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" PRELOADSTR("%1") "\n\
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str r3, [%0], #4\n\
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add r2, r1, r4\n\
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bic r2, r2, r1\n\
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ands r3, r2, r5\n\
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beq 0b\n\
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1:"
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: "=&r" (dest), "=&r" (src)
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: "0" (dest), "1" (src)
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: "r1", "r2", "r3", "r4", "r5", "memory", "cc");
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}
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#endif
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while (*dest++ = *src++)
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asm (PRELOADSTR ("%0") : : "r" (src));
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return dest0;
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}
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#endif
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