OpenBLAS/kernel/x86_64/cscal_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 cscal_kernel_16( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	/* _mm512_addsub_ps does not exist so we flip signs for odd elements of da_i */
	__m512 da_r = _mm512_set1_ps(alpha[0]);
	__m512 da_i = _mm512_set1_ps(alpha[1]) * _mm512_set4_ps(1, -1, 1, -1);
	for (; i < n2; i += 32) {
                __m512 x0 = _mm512_loadu_ps(&x[i +  0]);
                __m512 x1 = _mm512_loadu_ps(&x[i + 16]);
                __m512 y0 = _mm512_permute_ps(x0, 0xb1);
                __m512 y1 = _mm512_permute_ps(x1, 0xb1);
                _mm512_storeu_ps(&x[i +  0], _mm512_add_ps(da_r * x0, da_i * y0));
                _mm512_storeu_ps(&x[i + 16], _mm512_add_ps(da_r * x1, da_i * y1));
	}
#else
	__m256 da_r = _mm256_set1_ps(alpha[0]);
	__m256 da_i = _mm256_set1_ps(alpha[1]);
	for (; i < n2; i += 32) {
                __m256 x0 = _mm256_loadu_ps(&x[i +  0]);
                __m256 x1 = _mm256_loadu_ps(&x[i +  8]);
                __m256 x2 = _mm256_loadu_ps(&x[i + 16]);
                __m256 x3 = _mm256_loadu_ps(&x[i + 24]);
                __m256 y0 = _mm256_permute_ps(x0, 0xb1);
                __m256 y1 = _mm256_permute_ps(x1, 0xb1);
                __m256 y2 = _mm256_permute_ps(x2, 0xb1);
                __m256 y3 = _mm256_permute_ps(x3, 0xb1);
                _mm256_storeu_ps(&x[i +  0], _mm256_addsub_ps(da_r * x0, da_i * y0));
                _mm256_storeu_ps(&x[i +  8], _mm256_addsub_ps(da_r * x1, da_i * y1));
                _mm256_storeu_ps(&x[i + 16], _mm256_addsub_ps(da_r * x2, da_i * y2));
                _mm256_storeu_ps(&x[i + 24], _mm256_addsub_ps(da_r * x3, da_i * y3));
	}
#endif
}


static void cscal_kernel_16_zero_r( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	__m512 da_i = _mm512_set1_ps(alpha[1]) * _mm512_set4_ps(1, -1, 1, -1);
	for (; i < n2; i += 32) {
                __m512 y0 = _mm512_permute_ps(_mm512_loadu_ps(&x[i +  0]), 0xb1);
                __m512 y1 = _mm512_permute_ps(_mm512_loadu_ps(&x[i + 16]), 0xb1);
                _mm512_storeu_ps(&x[i +  0], da_i * y0);
                _mm512_storeu_ps(&x[i + 16], da_i * y1);
	}
#else
	__m256 da_i = _mm256_set1_ps(alpha[1]) * _mm256_set_ps(1, -1, 1, -1, 1, -1, 1, -1);
	for (; i < n2; i += 32) {
                __m256 y0 = _mm256_permute_ps(_mm256_loadu_ps(&x[i +  0]), 0xb1);
                __m256 y1 = _mm256_permute_ps(_mm256_loadu_ps(&x[i +  8]), 0xb1);
                __m256 y2 = _mm256_permute_ps(_mm256_loadu_ps(&x[i + 16]), 0xb1);
                __m256 y3 = _mm256_permute_ps(_mm256_loadu_ps(&x[i + 24]), 0xb1);
                _mm256_storeu_ps(&x[i +  0], da_i * y0);
                _mm256_storeu_ps(&x[i +  8], da_i * y1);
                _mm256_storeu_ps(&x[i + 16], da_i * y2);
                _mm256_storeu_ps(&x[i + 24], da_i * y3);
	}
#endif
}


static void cscal_kernel_16_zero_i( BLASLONG n, FLOAT *alpha, FLOAT *x)
{
	BLASLONG i = 0;
	BLASLONG n2 = n + n;

#ifdef __AVX512CD__
	__m512 da_r = _mm512_set1_ps(alpha[0]);
	for (; i < n2; i += 32) {
                _mm512_storeu_ps(&x[i +  0], da_r * _mm512_loadu_ps(&x[i +  0]));
                _mm512_storeu_ps(&x[i + 16], da_r * _mm512_loadu_ps(&x[i + 16]));
	}
#else
	__m256 da_r = _mm256_set1_ps(alpha[0]);
	for (; i < n2; i += 32) {
                _mm256_storeu_ps(&x[i +  0], da_r * _mm256_loadu_ps(&x[i +  0]));
                _mm256_storeu_ps(&x[i +  8], da_r * _mm256_loadu_ps(&x[i +  8]));
                _mm256_storeu_ps(&x[i + 16], da_r * _mm256_loadu_ps(&x[i + 16]));
                _mm256_storeu_ps(&x[i + 24], da_r * _mm256_loadu_ps(&x[i + 24]));
	}
#endif
}


static void cscal_kernel_16_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__
	__m512 zero = _mm512_setzero_ps();
	for (; i < n2; i += 32) {
                _mm512_storeu_ps(&x[i], zero);
                _mm512_storeu_ps(&x[i + 16], zero);
	}
#else
	__m256 zero = _mm256_setzero_ps();
	for (; i < n2; i += 32) {
                _mm256_storeu_ps(&x[i +  0], zero);
                _mm256_storeu_ps(&x[i +  8], zero);
                _mm256_storeu_ps(&x[i + 16], zero);
                _mm256_storeu_ps(&x[i + 24], zero);
	}
#endif

}

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