142 lines
5.6 KiB
C
142 lines
5.6 KiB
C
/*
|
|
* Copyright (c) 2015-2021, 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
|
|
|
|
// implementation of copy from BAR using MOVNTDQA
|
|
// suggested by Nicholas Wilt <nwilt@amazon.com>
|
|
|
|
// src is WC MMIO of GPU BAR
|
|
// dest is host memory
|
|
int memcpy_uncached_load_sse41(void *dest, const void *src, size_t n_bytes)
|
|
{
|
|
int ret = 0;
|
|
#ifdef __SSE4_1__
|
|
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 src to 128-bits
|
|
if (s_int & 0xf) {
|
|
size_t nh = min(0x10 - (s_int & 0x0f), n);
|
|
memcpy(d, s, nh);
|
|
d += nh; d_int += nh;
|
|
s += nh; s_int += nh;
|
|
n -= nh;
|
|
}
|
|
|
|
if (d_int & 0xf) { // dest is not aligned to 128-bits
|
|
__m128i r0,r1,r2,r3,r4,r5,r6,r7;
|
|
// unroll 8
|
|
while (n >= 8*sizeof(__m128i)) {
|
|
r0 = _mm_stream_load_si128 ((__m128i *)(s+0*sizeof(__m128i)));
|
|
r1 = _mm_stream_load_si128 ((__m128i *)(s+1*sizeof(__m128i)));
|
|
r2 = _mm_stream_load_si128 ((__m128i *)(s+2*sizeof(__m128i)));
|
|
r3 = _mm_stream_load_si128 ((__m128i *)(s+3*sizeof(__m128i)));
|
|
r4 = _mm_stream_load_si128 ((__m128i *)(s+4*sizeof(__m128i)));
|
|
r5 = _mm_stream_load_si128 ((__m128i *)(s+5*sizeof(__m128i)));
|
|
r6 = _mm_stream_load_si128 ((__m128i *)(s+6*sizeof(__m128i)));
|
|
r7 = _mm_stream_load_si128 ((__m128i *)(s+7*sizeof(__m128i)));
|
|
_mm_storeu_si128((__m128i *)(d+0*sizeof(__m128i)), r0);
|
|
_mm_storeu_si128((__m128i *)(d+1*sizeof(__m128i)), r1);
|
|
_mm_storeu_si128((__m128i *)(d+2*sizeof(__m128i)), r2);
|
|
_mm_storeu_si128((__m128i *)(d+3*sizeof(__m128i)), r3);
|
|
_mm_storeu_si128((__m128i *)(d+4*sizeof(__m128i)), r4);
|
|
_mm_storeu_si128((__m128i *)(d+5*sizeof(__m128i)), r5);
|
|
_mm_storeu_si128((__m128i *)(d+6*sizeof(__m128i)), r6);
|
|
_mm_storeu_si128((__m128i *)(d+7*sizeof(__m128i)), r7);
|
|
s += 8*sizeof(__m128i);
|
|
d += 8*sizeof(__m128i);
|
|
n -= 8*sizeof(__m128i);
|
|
}
|
|
while (n >= sizeof(__m128i)) {
|
|
r0 = _mm_stream_load_si128 ((__m128i *)(s+0*sizeof(__m128i)));
|
|
_mm_storeu_si128((__m128i *)(d+0*sizeof(__m128i)), r0);
|
|
s += sizeof(__m128i);
|
|
d += sizeof(__m128i);
|
|
n -= sizeof(__m128i);
|
|
}
|
|
} else { // or it IS aligned
|
|
__m128i r0,r1,r2,r3,r4,r5,r6,r7;
|
|
// unroll 8
|
|
while (n >= 8*sizeof(__m128i)) {
|
|
r0 = _mm_stream_load_si128 ((__m128i *)(s+0*sizeof(__m128i)));
|
|
r1 = _mm_stream_load_si128 ((__m128i *)(s+1*sizeof(__m128i)));
|
|
r2 = _mm_stream_load_si128 ((__m128i *)(s+2*sizeof(__m128i)));
|
|
r3 = _mm_stream_load_si128 ((__m128i *)(s+3*sizeof(__m128i)));
|
|
r4 = _mm_stream_load_si128 ((__m128i *)(s+4*sizeof(__m128i)));
|
|
r5 = _mm_stream_load_si128 ((__m128i *)(s+5*sizeof(__m128i)));
|
|
r6 = _mm_stream_load_si128 ((__m128i *)(s+6*sizeof(__m128i)));
|
|
r7 = _mm_stream_load_si128 ((__m128i *)(s+7*sizeof(__m128i)));
|
|
_mm_stream_si128((__m128i *)(d+0*sizeof(__m128i)), r0);
|
|
_mm_stream_si128((__m128i *)(d+1*sizeof(__m128i)), r1);
|
|
_mm_stream_si128((__m128i *)(d+2*sizeof(__m128i)), r2);
|
|
_mm_stream_si128((__m128i *)(d+3*sizeof(__m128i)), r3);
|
|
_mm_stream_si128((__m128i *)(d+4*sizeof(__m128i)), r4);
|
|
_mm_stream_si128((__m128i *)(d+5*sizeof(__m128i)), r5);
|
|
_mm_stream_si128((__m128i *)(d+6*sizeof(__m128i)), r6);
|
|
_mm_stream_si128((__m128i *)(d+7*sizeof(__m128i)), r7);
|
|
s += 8*sizeof(__m128i);
|
|
d += 8*sizeof(__m128i);
|
|
n -= 8*sizeof(__m128i);
|
|
}
|
|
while (n >= sizeof(__m128i)) {
|
|
r0 = _mm_stream_load_si128 ((__m128i *)(s+0*sizeof(__m128i)));
|
|
_mm_stream_si128((__m128i *)(d+0*sizeof(__m128i)), r0);
|
|
s += sizeof(__m128i);
|
|
d += sizeof(__m128i);
|
|
n -= sizeof(__m128i);
|
|
}
|
|
}
|
|
|
|
if (n)
|
|
memcpy(d, s, n);
|
|
|
|
// fencing because of NT stores
|
|
// potential optimization: issue only when NT stores are actually emitted
|
|
_mm_sfence();
|
|
|
|
#else
|
|
#error "this file should be compiled with -msse4.1"
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-indent-level: 4
|
|
* c-basic-offset: 4
|
|
* tab-width: 4
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*/
|