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Add an AVX512 enabled DGEMV (n) function 

written in C intrinsics for best readability.
(the same C code works for Haswell as well)

For logistical reasons the code falls back to the existing
haswell AVX2 implementation if the GCC or LLVM compiler is not new enough
This commit is contained in:
Arjan van de Ven 2018-08-11 17:38:12 +00:00
parent 1a00ef3d27
commit 87bebdbd8a
2 changed files with 129 additions and 1 deletions
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4
kernel/x86_64/dgemv_n_4.c
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@ -31,8 +31,10 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#if defined(NEHALEM)
#include "dgemv_n_microk_nehalem-4.c"
#elif defined(HASWELL) || defined(ZEN) || defined(STEAMROLLER) || defined(EXCAVATOR) || defined (SKYLAKEX)
#elif defined(HASWELL) || defined(ZEN) || defined(STEAMROLLER) || defined(EXCAVATOR)
#include "dgemv_n_microk_haswell-4.c"
#elif defined (SKYLAKEX)
#include "dgemv_n_microk_skylakex-4.c"
#endif

126
kernel/x86_64/dgemv_n_microk_skylakex-4.c Normal file
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@ -0,0 +1,126 @@
/***************************************************************************
Copyright (c) 2014, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. Neither the name of the OpenBLAS project nor the names of
its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
/* need a new enough GCC for avx512 support */
#if (( defined(__GNUC__) && __GNUC__ > 6 && defined(__AVX2__)) || (defined(__clang__) && __clang_major__ >= 6))
#define HAVE_KERNEL_4x4 1
#include <immintrin.h>
static void dgemv_kernel_4x4( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{
int i = 0;
__m256d x0, x1, x2, x3;
__m256d __alpha;
x0 = _mm256_broadcastsd_pd(_mm_load_sd(&x[0]));
x1 = _mm256_broadcastsd_pd(_mm_load_sd(&x[1]));
x2 = _mm256_broadcastsd_pd(_mm_load_sd(&x[2]));
x3 = _mm256_broadcastsd_pd(_mm_load_sd(&x[3]));
__alpha = _mm256_broadcastsd_pd(_mm_load_sd(alpha));
#ifdef __AVX512CD__
int n5;
__m512d x05, x15, x25, x35;
__m512d __alpha5;
n5 = n & ~7;
x05 = _mm512_broadcastsd_pd(_mm_load_sd(&x[0]));
x15 = _mm512_broadcastsd_pd(_mm_load_sd(&x[1]));
x25 = _mm512_broadcastsd_pd(_mm_load_sd(&x[2]));
x35 = _mm512_broadcastsd_pd(_mm_load_sd(&x[3]));
__alpha5 = _mm512_broadcastsd_pd(_mm_load_sd(alpha));
for (; i < n5; i+= 8) {
__m512d tempY;
__m512d sum;
sum = _mm512_loadu_pd(&ap[0][i]) * x05 +
_mm512_loadu_pd(&ap[1][i]) * x15 +
_mm512_loadu_pd(&ap[2][i]) * x25 +
_mm512_loadu_pd(&ap[3][i]) * x35;
tempY = _mm512_loadu_pd(&y[i]);
tempY += sum * __alpha5;
_mm512_storeu_pd(&y[i], tempY);
}
#endif
for (; i < n; i+= 4) {
__m256d tempY;
__m256d sum;
sum = _mm256_loadu_pd(&ap[0][i]) * x0 +
_mm256_loadu_pd(&ap[1][i]) * x1 +
_mm256_loadu_pd(&ap[2][i]) * x2 +
_mm256_loadu_pd(&ap[3][i]) * x3;
tempY = _mm256_loadu_pd(&y[i]);
tempY += sum * __alpha;
_mm256_storeu_pd(&y[i], tempY);
}
}
#define HAVE_KERNEL_4x2
static void dgemv_kernel_4x2( BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y, FLOAT *alpha)
{
int i = 0;
__m256d x0, x1;
__m256d __alpha;
x0 = _mm256_broadcastsd_pd(_mm_load_sd(&x[0]));
x1 = _mm256_broadcastsd_pd(_mm_load_sd(&x[1]));
__alpha = _mm256_broadcastsd_pd(_mm_load_sd(alpha));
for (i = 0; i < n; i+= 4) {
__m256d tempY;
__m256d sum;
sum = _mm256_loadu_pd(&ap[0][i]) * x0 + _mm256_loadu_pd(&ap[1][i]) * x1;
tempY = _mm256_loadu_pd(&y[i]);
tempY += sum * __alpha;
_mm256_storeu_pd(&y[i], tempY);
}
}
#else
#include "dgemv_n_microk_haswell-4.c"
#endif