28 lines
621 B
C
28 lines
621 B
C
#include <stddef.h>
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#include <stdint.h>
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#pragma GCC optimize ("no-tree-loop-distribute-patterns")
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void* memcpy(void * dst, void const * src, size_t len) {
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uint32_t * plDst = (uint32_t *) dst;
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uint32_t const * plSrc = (uint32_t const *) src;
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// If source and destination are aligned,
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// copy 32s bit by 32 bits.
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if (!((uint32_t)src & 3) && !((uint32_t)dst & 3)) {
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while (len >= 4) {
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*plDst++ = *plSrc++;
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len -= 4;
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}
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}
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uint8_t* pcDst = (uint8_t *) plDst;
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uint8_t const* pcSrc = (uint8_t const *) plSrc;
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while (len--) {
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*pcDst++ = *pcSrc++;
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}
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return dst;
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}
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