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fa57ac7
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master
mips_sys
fw
memcpy.c
fixed memcpy (it coppied too much)
Stefan Schuermans
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fa57ac7
at 2012-03-24 22:41:56
memcpy.c
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#include "memcpy.h" /** * @brief copy memory * @param[in] dest pointer to destination buffer * @param[in] src pointer to source data * @param[in] sz size of data to copy */ void memcpy(void *dest, const void *src, unsigned int sz) { unsigned int *dest4; const unsigned int *src4; unsigned int sz4; unsigned char *dest1; const unsigned char *src1; // word aligned memory addresses -> fast copy if (((unsigned int)dest & 3) == 0 && ((unsigned int)src & 3) == 0) { dest4 = dest; src4 = src; sz4 = sz >> 2; for ( ; sz4 > 0; --sz4) *dest4++ = *src4++; // there might still be a few bytes to copy now dest = dest4; src = src4; sz &= 3; } // safe and slow fallback: copy byte-wise dest1 = dest; src1 = src; for ( ; sz > 0; --sz) *dest1++ = *src1++; }
