OpenBLAS/kernel/x86_64/zscal_microk_skylakex-2.c

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/* need a new enough GCC for avx512 support */
#ifdef __NVCOMPILER
#define NVCOMPVERS ( __NVCOMPILER_MAJOR__ * 100 + __NVCOMPILER_MINOR__ )
#endif
#if (( defined(__GNUC__)  && __GNUC__   > 6 && defined(__AVX2__)) || (defined(__clang__) && __clang_major__ >= 6)) || (defined(__NVCOMPILER) && NVCOMPVERS >= 2203 )


#include <immintrin.h>

#define HAVE_KERNEL_8 1

static void zscal_kernel_8( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	/* _mm512_addsub_pd does not exist so we flip signs for odd elements of da_i */
	__m512d da_r = _mm512_set1_pd(alpha[0]);
	__m512d da_i = _mm512_set1_pd(alpha[1]) * _mm512_set4_pd(1, -1, 1, -1);
	for (; i < n2; i += 16) {
                __m512d x0 = _mm512_loadu_pd(&x[i +  0]);
                __m512d x1 = _mm512_loadu_pd(&x[i +  8]);
                __m512d y0 = _mm512_permute_pd(x0, 0x55);
                __m512d y1 = _mm512_permute_pd(x1, 0x55);
                _mm512_storeu_pd(&x[i +  0], _mm512_add_pd(da_r * x0, da_i * y0));
                _mm512_storeu_pd(&x[i +  8], _mm512_add_pd(da_r * x1, da_i * y1));
	}
#else
	__m256d da_r = _mm256_set1_pd(alpha[0]);
	__m256d da_i = _mm256_set1_pd(alpha[1]);
	for (; i < n2; i += 16) {
                __m256d x0 = _mm256_loadu_pd(&x[i +  0]);
                __m256d x1 = _mm256_loadu_pd(&x[i +  4]);
                __m256d x2 = _mm256_loadu_pd(&x[i +  8]);
                __m256d x3 = _mm256_loadu_pd(&x[i + 12]);
                __m256d y0 = _mm256_permute_pd(x0, 0x05);
                __m256d y1 = _mm256_permute_pd(x1, 0x05);
                __m256d y2 = _mm256_permute_pd(x2, 0x05);
                __m256d y3 = _mm256_permute_pd(x3, 0x05);
                _mm256_storeu_pd(&x[i +  0], _mm256_addsub_pd(da_r * x0, da_i * y0));
                _mm256_storeu_pd(&x[i +  4], _mm256_addsub_pd(da_r * x1, da_i * y1));
                _mm256_storeu_pd(&x[i +  8], _mm256_addsub_pd(da_r * x2, da_i * y2));
                _mm256_storeu_pd(&x[i + 12], _mm256_addsub_pd(da_r * x3, da_i * y3));
	}
#endif
}


static void zscal_kernel_8_zero_r( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	__m512d da_i = _mm512_set1_pd(alpha[1]) * _mm512_set4_pd(1, -1, 1, -1);
	for (; i < n2; i += 16) {
                __m512d y0 = _mm512_permute_pd(_mm512_loadu_pd(&x[i +  0]), 0x55);
                __m512d y1 = _mm512_permute_pd(_mm512_loadu_pd(&x[i +  8]), 0x55);
                _mm512_storeu_pd(&x[i +  0], da_i * y0);
                _mm512_storeu_pd(&x[i +  8], da_i * y1);
	}
#else
	__m256d da_i = _mm256_set1_pd(alpha[1]) * _mm256_set_pd(1, -1, 1, -1);
	for (; i < n2; i += 16) {
                __m256d y0 = _mm256_permute_pd(_mm256_loadu_pd(&x[i +  0]), 0x05);
                __m256d y1 = _mm256_permute_pd(_mm256_loadu_pd(&x[i +  8]), 0x05);
                __m256d y2 = _mm256_permute_pd(_mm256_loadu_pd(&x[i + 16]), 0x05);
                __m256d y3 = _mm256_permute_pd(_mm256_loadu_pd(&x[i + 24]), 0x05);
                _mm256_storeu_pd(&x[i +  0], da_i * y0);
                _mm256_storeu_pd(&x[i +  4], da_i * y1);
                _mm256_storeu_pd(&x[i +  8], da_i * y2);
                _mm256_storeu_pd(&x[i + 12], da_i * y3);
	}
#endif
}


static void zscal_kernel_8_zero_i( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	__m512d da_r = _mm512_set1_pd(alpha[0]);
	for (; i < n2; i += 16) {
                _mm512_storeu_pd(&x[i +  0], da_r * _mm512_loadu_pd(&x[i +  0]));
                _mm512_storeu_pd(&x[i +  8], da_r * _mm512_loadu_pd(&x[i +  8]));
	}
#else
	__m256d da_r = _mm256_set1_pd(alpha[0]);
	for (; i < n2; i += 16) {
                _mm256_storeu_pd(&x[i +  0], da_r * _mm256_loadu_pd(&x[i +  0]));
                _mm256_storeu_pd(&x[i +  4], da_r * _mm256_loadu_pd(&x[i +  4]));
                _mm256_storeu_pd(&x[i +  8], da_r * _mm256_loadu_pd(&x[i +  8]));
                _mm256_storeu_pd(&x[i + 12], da_r * _mm256_loadu_pd(&x[i + 12]));
	}
#endif
}


static void zscal_kernel_8_zero( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

	/* question to self: Why is this not just memset() */

#ifdef __AVX512CD__
	__m512d zero = _mm512_setzero_pd();
	for (; i < n2; i += 16) {
                _mm512_storeu_pd(&x[i], zero);
                _mm512_storeu_pd(&x[i +  8], zero);
	}
#else
	__m256d zero = _mm256_setzero_pd();
	for (; i < n2; i += 16) {
                _mm256_storeu_pd(&x[i +  0], zero);
                _mm256_storeu_pd(&x[i +  4], zero);
                _mm256_storeu_pd(&x[i +  8], zero);
                _mm256_storeu_pd(&x[i + 12], zero);
	}
#endif

}

#else
#include "zscal_microk_haswell-2.c"
#endif