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/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin. */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* 1. Redistributions of source code must retain the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer. */
/* */
/* 2. 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. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY OF TEXAS AT */
/* AUSTIN ``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 UNIVERSITY OF TEXAS AT */
/* AUSTIN 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. */
/* */
/* The views and conclusions contained in the software and */
/* documentation are those of the authors and should not be */
/* interpreted as representing official policies, either expressed */
/* or implied, of The University of Texas at Austin. */
/*********************************************************************/
#include <stdio.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif
#if defined(THUNDERX2T99) || defined(VULCAN) || defined(ARMV8) || defined(THUNDERX3T110)
// Multithreaded swap gives performance benefits in ThunderX2T99
#else
// Disable multi-threading as it does not show any performance
// benefits. Keep the multi-threading code for the record.
#undef SMP
#endif
#ifndef CBLAS
void NAME(blasint *N, FLOAT *x, blasint *INCX, FLOAT *y, blasint *INCY){
blasint n = *N;
blasint incx = *INCX;
blasint incy = *INCY;
#else
void CNAME(blasint n, FLOAT *x, blasint incx, FLOAT *y, blasint incy){
#endif
#ifdef SMP
int mode, nthreads;
FLOAT dummyalpha[2] = {ZERO, ZERO};
#endif
#ifndef CBLAS
PRINT_DEBUG_NAME;
#else
PRINT_DEBUG_CNAME;
#endif
if (n <= 0) return;
IDEBUG_START;
FUNCTION_PROFILE_START();
if (incx < 0) x -= (n - 1) * incx;
if (incy < 0) y -= (n - 1) * incy;
#ifdef SMP
//disable multi-thread when incx==0 or incy==0
//In that case, the threads would be dependent.
if (incx == 0 || incy == 0 || n < 2097152 * GEMM_MULTITHREAD_THRESHOLD / sizeof(FLOAT))
nthreads = 1;
else
nthreads = num_cpu_avail(1);
if (nthreads == 1) {
#endif
SWAP_K(n, 0, 0, ZERO, x, incx, y, incy, NULL, 0);
#ifdef SMP
} else {
#ifdef XDOUBLE
mode = BLAS_XDOUBLE | BLAS_REAL;
#elif defined(DOUBLE)
mode = BLAS_DOUBLE | BLAS_REAL;
#else
mode = BLAS_SINGLE | BLAS_REAL;
#endif
blas_level1_thread(mode, n, 0, 0, dummyalpha,
x, incx, y, incy, NULL, 0, (void *)SWAP_K, nthreads);
}
#endif
FUNCTION_PROFILE_END(1, 2 * n, 0);
IDEBUG_END;
return;
}
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