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memcpy_sse.c
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memcpy_sse.c
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/*
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <immintrin.h>
#ifndef min
#define min(A,B) ((A)<(B)?(A):(B))
#endif
int memcpy_uncached_store_sse(void *dest, const void *src, size_t n_bytes)
{
int ret = 0;
#ifdef __SSE__
char *d = (char*)dest;
uintptr_t d_int = (uintptr_t)d;
const char *s = (const char *)src;
uintptr_t s_int = (uintptr_t)s;
size_t n = n_bytes;
// align dest to 128-bits
if (d_int & 0xf) {
size_t nh = min(0x10 - (d_int & 0x0f), n);
memcpy(d, s, nh);
d += nh; d_int += nh;
s += nh; s_int += nh;
n -= nh;
}
if (s_int & 0xf) { // src is not aligned to 128-bits
__m128 r0,r1,r2,r3;
// unroll 4
while (n >= 4*4*sizeof(float)) {
r0 = _mm_loadu_ps((float *)(s+0*4*sizeof(float)));
r1 = _mm_loadu_ps((float *)(s+1*4*sizeof(float)));
r2 = _mm_loadu_ps((float *)(s+2*4*sizeof(float)));
r3 = _mm_loadu_ps((float *)(s+3*4*sizeof(float)));
_mm_stream_ps((float *)(d+0*4*sizeof(float)), r0);
_mm_stream_ps((float *)(d+1*4*sizeof(float)), r1);
_mm_stream_ps((float *)(d+2*4*sizeof(float)), r2);
_mm_stream_ps((float *)(d+3*4*sizeof(float)), r3);
s += 4*4*sizeof(float);
d += 4*4*sizeof(float);
n -= 4*4*sizeof(float);
}
while (n >= 4*sizeof(float)) {
r0 = _mm_loadu_ps((float *)(s));
_mm_stream_ps((float *)(d), r0);
s += 4*sizeof(float);
d += 4*sizeof(float);
n -= 4*sizeof(float);
}
} else { // or it IS aligned
__m128 r0,r1,r2,r3;
// unroll 4
while (n >= 4*4*sizeof(float)) {
r0 = _mm_load_ps((float *)(s+0*4*sizeof(float)));
r1 = _mm_load_ps((float *)(s+1*4*sizeof(float)));
r2 = _mm_load_ps((float *)(s+2*4*sizeof(float)));
r3 = _mm_load_ps((float *)(s+3*4*sizeof(float)));
_mm_stream_ps((float *)(d+0*4*sizeof(float)), r0);
_mm_stream_ps((float *)(d+1*4*sizeof(float)), r1);
_mm_stream_ps((float *)(d+2*4*sizeof(float)), r2);
_mm_stream_ps((float *)(d+3*4*sizeof(float)), r3);
s += 4*4*sizeof(float);
d += 4*4*sizeof(float);
n -= 4*4*sizeof(float);
}
while (n >= 4*sizeof(float)) {
r0 = _mm_load_ps((float *)(s));
_mm_stream_ps((float *)(d), r0);
s += 4*sizeof(float);
d += 4*sizeof(float);
n -= 4*sizeof(float);
}
}
_mm_sfence();
if (n)
memcpy(d, s, n);
#else
#error "this file should be compiled with -msse"
#endif
return ret;
}
int memcpy_cached_store_sse(void *dest, const void *src, size_t n_bytes)
{
int ret = 0;
#ifdef __SSE__
char *d = (char*)dest;
uintptr_t d_int = (uintptr_t)d;
const char *s = (const char *)src;
uintptr_t s_int = (uintptr_t)s;
size_t n = n_bytes;
// align dest to 128-bits
if (d_int & 0xf) {
size_t nh = min(0x10 - (d_int & 0x0f), n);
memcpy(d, s, nh);
d += nh; d_int += nh;
s += nh; s_int += nh;
n -= nh;
}
if (s_int & 0xf) { // src is not aligned to 128-bits
__m128 r0,r1,r2,r3;
// unroll 4
while (n >= 4*4*sizeof(float)) {
r0 = _mm_loadu_ps((float *)(s+0*4*sizeof(float)));
r1 = _mm_loadu_ps((float *)(s+1*4*sizeof(float)));
r2 = _mm_loadu_ps((float *)(s+2*4*sizeof(float)));
r3 = _mm_loadu_ps((float *)(s+3*4*sizeof(float)));
_mm_store_ps((float *)(d+0*4*sizeof(float)), r0);
_mm_store_ps((float *)(d+1*4*sizeof(float)), r1);
_mm_store_ps((float *)(d+2*4*sizeof(float)), r2);
_mm_store_ps((float *)(d+3*4*sizeof(float)), r3);
s += 4*4*sizeof(float);
d += 4*4*sizeof(float);
n -= 4*4*sizeof(float);
}
while (n >= 4*sizeof(float)) {
r0 = _mm_loadu_ps((float *)(s));
_mm_store_ps((float *)(d), r0);
s += 4*sizeof(float);
d += 4*sizeof(float);
n -= 4*sizeof(float);
}
} else { // or it IS aligned
__m128 r0,r1,r2,r3;
// unroll 4
while (n >= 4*4*sizeof(float)) {
r0 = _mm_load_ps((float *)(s+0*4*sizeof(float)));
r1 = _mm_load_ps((float *)(s+1*4*sizeof(float)));
r2 = _mm_load_ps((float *)(s+2*4*sizeof(float)));
r3 = _mm_load_ps((float *)(s+3*4*sizeof(float)));
_mm_store_ps((float *)(d+0*4*sizeof(float)), r0);
_mm_store_ps((float *)(d+1*4*sizeof(float)), r1);
_mm_store_ps((float *)(d+2*4*sizeof(float)), r2);
_mm_store_ps((float *)(d+3*4*sizeof(float)), r3);
s += 4*4*sizeof(float);
d += 4*4*sizeof(float);
n -= 4*4*sizeof(float);
}
while (n >= 4*sizeof(float)) {
r0 = _mm_load_ps((float *)(s));
_mm_store_ps((float *)(d), r0);
s += 4*sizeof(float);
d += 4*sizeof(float);
n -= 4*sizeof(float);
}
}
if (n)
memcpy(d, s, n);
#else
#error "this file should be compiled with -msse"
#endif
return ret;
}
/*
* Local variables:
* c-indent-level: 4
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/