85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/***************************************************************************
|
|
* Copyright (C) 2016
|
|
* by Dimok
|
|
*
|
|
* This software is provided 'as-is', without any express or implied
|
|
* warranty. In no event will the authors be held liable for any
|
|
* damages arising from the use of this software.
|
|
*
|
|
* Permission is granted to anyone to use this software for any
|
|
* purpose, including commercial applications, and to alter it and
|
|
* redistribute it freely, subject to the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be misrepresented; you
|
|
* must not claim that you wrote the original software. If you use
|
|
* this software in a product, an acknowledgment in the product
|
|
* documentation would be appreciated but is not required.
|
|
*
|
|
* 2. Altered source versions must be plainly marked as such, and
|
|
* must not be misrepresented as being the original software.
|
|
*
|
|
* 3. This notice may not be removed or altered from any source
|
|
* distribution.
|
|
***************************************************************************/
|
|
|
|
// this memcpy is optimized for speed and to work with MEM1 32 bit access alignment requirement
|
|
void reverse_memcpy(void *dst, const void *src, unsigned int size) {
|
|
const unsigned char *src_p;
|
|
unsigned char *dst_p;
|
|
|
|
if ((size >= 4) && !((dst - src) & 3)) {
|
|
const unsigned int *src_p32;
|
|
unsigned int *dst_p32;
|
|
unsigned int endDst = ((unsigned int) dst) + size;
|
|
unsigned int endRest = endDst & 3;
|
|
|
|
if (endRest) {
|
|
src_p = ((const unsigned char *) (src + size)) - 1;
|
|
dst_p = ((unsigned char *) endDst) - 1;
|
|
size -= endRest;
|
|
|
|
while (endRest--)
|
|
*dst_p-- = *src_p--;
|
|
}
|
|
|
|
src_p32 = ((const unsigned int *) (src + size)) - 1;
|
|
dst_p32 = ((unsigned int *) (dst + size)) - 1;
|
|
|
|
unsigned int size32 = size >> 5;
|
|
if (size32) {
|
|
size &= 0x1F;
|
|
|
|
while (size32--) {
|
|
src_p32 -= 8;
|
|
dst_p32 -= 8;
|
|
|
|
dst_p32[8] = src_p32[8];
|
|
dst_p32[7] = src_p32[7];
|
|
dst_p32[6] = src_p32[6];
|
|
dst_p32[5] = src_p32[5];
|
|
dst_p32[4] = src_p32[4];
|
|
dst_p32[3] = src_p32[3];
|
|
dst_p32[2] = src_p32[2];
|
|
dst_p32[1] = src_p32[1];
|
|
}
|
|
}
|
|
|
|
unsigned int size4 = size >> 2;
|
|
if (size4) {
|
|
size &= 3;
|
|
|
|
while (size4--)
|
|
*dst_p32-- = *src_p32--;
|
|
}
|
|
|
|
dst_p = ((unsigned char *) dst_p32) + 3;
|
|
src_p = ((const unsigned char *) src_p32) + 3;
|
|
} else {
|
|
dst_p = ((unsigned char *) dst) + size - 1;
|
|
src_p = ((const unsigned char *) src) + size - 1;
|
|
}
|
|
|
|
while (size--)
|
|
*dst_p-- = *src_p--;
|
|
}
|