OpenBLAS/kernel/x86_64/dgemv_n_microk_skylakex-4.c

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/* 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