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/*
* Copyright (C) 2014, The University of Texas at Austin
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of The University of Texas at Austin nor the names
* of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* Copyright (C) 2014-2015, Michael Lehn
*
* ulmBLAS adopted general ideas from BLIS. Using micro kernels from BLIS
* only requires minor modifications,
*
*/
#ifndef ULMBLAS_IMPL_LEVEL1_KERNEL_SSE_AXPY_TCC
#define ULMBLAS_IMPL_LEVEL1_KERNEL_SSE_AXPY_TCC 1
#include <immintrin.h>
#include <ulmblas/impl/auxiliary/isaligned.h>
#include <ulmblas/impl/level1/kernel/ref/axpy.h>
#include <ulmblas/impl/level1/kernel/sse/axpy.h>
namespace ulmBLAS { namespace sse {
//
// ----------------
// Double Precision
// ----------------
//
template <typename IndexType>
void
axpy(IndexType n,
const double &alpha,
const double *x,
IndexType incX,
double *y,
IndexType incY)
{
if (n<=0 || alpha==double(0)) {
return;
}
if (incX!=1 || incY!=1) {
ref::axpy(n, alpha, x, incX, y, incY);
return;
}
bool xAligned = isAligned(x, 16);
bool yAligned = isAligned(y, 16);
if (!xAligned && !yAligned) {
y[0] += alpha*x[0];
++x;
++y;
--n;
xAligned = yAligned = true;
}
if (xAligned && yAligned) {
IndexType nb = n / 6;
IndexType nl = n % 6;
__m128d alpha11, x12, x34, x56, y12, y34, y56;
alpha11 = _mm_loaddup_pd(&alpha);
for (IndexType i=0; i<nb; ++i) {
x12 = _mm_load_pd(x);
y12 = _mm_load_pd(y);
x12 = x12 * alpha11;
y12 = y12 + x12;
_mm_store_pd(y, y12);
x34 = _mm_load_pd(x+2);
y34 = _mm_load_pd(y+2);
x34 = x34 * alpha11;
y34 = y34 + x34;
_mm_store_pd(y+2, y34);
x56 = _mm_load_pd(x+4);
y56 = _mm_load_pd(y+4);
x56 = x56 * alpha11;
y56 = y56 + x56;
_mm_store_pd(y+4, y56);
x += 6;
y += 6;
}
for (IndexType i=0; i<nl; ++i) {
y[i] += alpha*x[i];
}
} else {
ref::axpy(n, alpha, x, IndexType(1), y, IndexType(1));
}
}
} } // namespace sse, ulmBLAS
#endif // ULMBLAS_IMPL_LEVEL1_KERNEL_SSE_AXPY_TCC 1
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