OpenBLAS/kernel/x86_64/dscal_microk_skylakex-2.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))

#include <immintrin.h>

#define HAVE_KERNEL_8 1

static void dscal_kernel_8( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	int i = 0;

#ifdef __AVX512CD__
	__m512d __alpha5 = _mm512_broadcastsd_pd(_mm_load_sd(alpha));
	for (; i < n; i += 8) {
                _mm512_storeu_pd(&x[i +  0], __alpha5 * _mm512_loadu_pd(&x[i +  0]));
	}
#else
	__m256d __alpha = _mm256_broadcastsd_pd(_mm_load_sd(alpha));
	for (; i < n; i += 8) {
                _mm256_storeu_pd(&x[i +  0], __alpha * _mm256_loadu_pd(&x[i +  0]));
                _mm256_storeu_pd(&x[i +  4], __alpha * _mm256_loadu_pd(&x[i +  4]));
	}
#endif
} 


static void dscal_kernel_8_zero( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	int i = 0;

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

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

} 

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