76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
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#include <linux/types.h>
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void * memcpy(void * to, const void * from, size_t n)
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{
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void *xto = to;
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size_t temp, temp1;
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if (!n)
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return xto;
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if ((long) to & 1)
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{
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char *cto = to;
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const char *cfrom = from;
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*cto++ = *cfrom++;
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to = cto;
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from = cfrom;
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n--;
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}
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if (n > 2 && (long) to & 2)
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{
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short *sto = to;
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const short *sfrom = from;
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*sto++ = *sfrom++;
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to = sto;
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from = sfrom;
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n -= 2;
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}
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temp = n >> 2;
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if (temp)
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{
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long *lto = to;
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const long *lfrom = from;
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__asm__ __volatile__("movel %2,%3\n\t"
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"andw #7,%3\n\t"
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"lsrl #3,%2\n\t"
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"negw %3\n\t"
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"jmp %%pc@(1f,%3:w:2)\n\t"
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"4:\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"movel %0@+,%1@+\n\t"
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"1:\t"
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"dbra %2,4b\n\t"
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"clrw %2\n\t"
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"subql #1,%2\n\t"
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"jpl 4b\n\t"
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: "=a" (lfrom), "=a" (lto), "=d" (temp),
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"=&d" (temp1)
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: "0" (lfrom), "1" (lto), "2" (temp)
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);
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to = lto;
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from = lfrom;
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}
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if (n & 2)
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{
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short *sto = to;
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const short *sfrom = from;
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*sto++ = *sfrom++;
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to = sto;
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from = sfrom;
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}
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if (n & 1)
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{
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char *cto = to;
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const char *cfrom = from;
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*cto = *cfrom;
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}
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return xto;
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}
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