97 lines
4.0 KiB
C
97 lines
4.0 KiB
C
/***************************************************************************
|
|
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_8 1
|
|
|
|
#include <immintrin.h>
|
|
|
|
static void ddot_kernel_8( BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *dot)
|
|
{
|
|
int i = 0;
|
|
__m256d accum_0, accum_1, accum_2, accum_3;
|
|
|
|
accum_0 = _mm256_setzero_pd();
|
|
accum_1 = _mm256_setzero_pd();
|
|
accum_2 = _mm256_setzero_pd();
|
|
accum_3 = _mm256_setzero_pd();
|
|
|
|
#ifdef __AVX512CD__
|
|
__m512d accum_05, accum_15, accum_25, accum_35;
|
|
int n32;
|
|
n32 = n & (~31);
|
|
|
|
accum_05 = _mm512_setzero_pd();
|
|
accum_15 = _mm512_setzero_pd();
|
|
accum_25 = _mm512_setzero_pd();
|
|
accum_35 = _mm512_setzero_pd();
|
|
|
|
for (; i < n32; i += 32) {
|
|
accum_05 += _mm512_loadu_pd(&x[i+ 0]) * _mm512_loadu_pd(&y[i+ 0]);
|
|
accum_15 += _mm512_loadu_pd(&x[i+ 8]) * _mm512_loadu_pd(&y[i+ 8]);
|
|
accum_25 += _mm512_loadu_pd(&x[i+16]) * _mm512_loadu_pd(&y[i+16]);
|
|
accum_35 += _mm512_loadu_pd(&x[i+24]) * _mm512_loadu_pd(&y[i+24]);
|
|
}
|
|
|
|
/*
|
|
* we need to fold our 512 bit wide accumulator vectors into 256 bit wide vectors so that the AVX2 code
|
|
* below can continue using the intermediate results in its loop
|
|
*/
|
|
accum_0 = _mm512_extractf64x4_pd(accum_05, 0) + _mm512_extractf64x4_pd(accum_05, 1);
|
|
accum_1 = _mm512_extractf64x4_pd(accum_15, 0) + _mm512_extractf64x4_pd(accum_15, 1);
|
|
accum_2 = _mm512_extractf64x4_pd(accum_25, 0) + _mm512_extractf64x4_pd(accum_25, 1);
|
|
accum_3 = _mm512_extractf64x4_pd(accum_35, 0) + _mm512_extractf64x4_pd(accum_35, 1);
|
|
|
|
#endif
|
|
for (; i < n; i += 16) {
|
|
accum_0 += _mm256_loadu_pd(&x[i+ 0]) * _mm256_loadu_pd(&y[i+ 0]);
|
|
accum_1 += _mm256_loadu_pd(&x[i+ 4]) * _mm256_loadu_pd(&y[i+ 4]);
|
|
accum_2 += _mm256_loadu_pd(&x[i+ 8]) * _mm256_loadu_pd(&y[i+ 8]);
|
|
accum_3 += _mm256_loadu_pd(&x[i+12]) * _mm256_loadu_pd(&y[i+12]);
|
|
}
|
|
|
|
/* we now have the partial sums of the dot product in the 4 accumulation vectors, time to consolidate */
|
|
|
|
accum_0 = accum_0 + accum_1 + accum_2 + accum_3;
|
|
|
|
__m128d half_accum0;
|
|
|
|
/* Add upper half to lower half of each of the 256 bit vector to get a 128 bit vector */
|
|
half_accum0 = _mm_add_pd(_mm256_extractf128_pd(accum_0, 0), _mm256_extractf128_pd(accum_0, 1));
|
|
|
|
/* in 128 bit land there is a hadd operation to do the rest of the element-wise sum in one go */
|
|
half_accum0 = _mm_hadd_pd(half_accum0, half_accum0);
|
|
|
|
*dot = half_accum0[0];
|
|
}
|
|
|
|
#else
|
|
#include "ddot_microk_haswell-2.c"
|
|
#endif
|