OpenBLAS/kernel/x86_64/sscal_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_16 1

static void sscal_kernel_16( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	int i = 0;

#ifdef __AVX512CD__
	__m512 __alpha5 = _mm512_broadcastss_ps(_mm_load_ss(alpha));
	BLASLONG nn = n & -32;
	for (; i < nn; i += 32) {
		__m512 a = _mm512_loadu_ps(&x[i +  0]);
		__m512 b = _mm512_loadu_ps(&x[i + 16]);
		a *= __alpha5;
		b *= __alpha5;
		_mm512_storeu_ps(&x[i +  0], a);
                _mm512_storeu_ps(&x[i + 16], b);
	}
	for (; i < n; i += 16) {
                _mm512_storeu_ps(&x[i +  0], __alpha5 * _mm512_loadu_ps(&x[i +  0]));
	}
#else
	__m256 __alpha = _mm256_broadcastss_ps(_mm_load_ss(alpha));
	for (; i < n; i += 16) {
                _mm256_storeu_ps(&x[i +  0], __alpha * _mm256_loadu_ps(&x[i +  0]));
                _mm256_storeu_ps(&x[i +  8], __alpha * _mm256_loadu_ps(&x[i +  8]));
	}
#endif
}


static void sscal_kernel_16_zero( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	int i = 0;

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

#ifdef __AVX512CD__
	__m512 zero = _mm512_setzero_ps();
	for (; i < n; i += 16) {
                _mm512_storeu_ps(&x[i], zero);
	}
#else
	__m256 zero = _mm256_setzero_ps();
	for (; i < n; i += 16) {
                _mm256_storeu_ps(&x[i +  0], zero);
                _mm256_storeu_ps(&x[i +  8], zero);
	}
#endif

}

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