139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/*********************************************************************/
|
|
/* 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"
|
|
|
|
double fabs(double);
|
|
|
|
static FLOAT dp1 = 1.;
|
|
static FLOAT dm1 = -1.;
|
|
|
|
blasint CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *sa, FLOAT *sb, BLASLONG myid) {
|
|
|
|
BLASLONG m, n, lda, offset;
|
|
blasint *ipiv;
|
|
FLOAT *a;
|
|
|
|
FLOAT temp1, temp2, temp3, temp4, ratio, den;
|
|
blasint i, j;
|
|
blasint ip, jp;
|
|
blasint info;
|
|
BLASLONG len;
|
|
FLOAT *b;
|
|
|
|
m = args -> m;
|
|
n = args -> n;
|
|
a = (FLOAT *)args -> a;
|
|
lda = args -> lda;
|
|
ipiv = (blasint *)args -> c;
|
|
offset = 0;
|
|
|
|
if (range_n) {
|
|
m -= range_n[0];
|
|
n = range_n[1] - range_n[0];
|
|
offset = range_n[0];
|
|
a += range_n[0] * (lda + 1) * COMPSIZE;
|
|
}
|
|
|
|
info = 0;
|
|
b = a;
|
|
|
|
for (j = 0; j < n; j++) {
|
|
|
|
len = MIN(j, m);
|
|
|
|
for (i = 0; i < len; i++) {
|
|
ip = ipiv[i + offset] - 1 - offset;
|
|
if (ip != i) {
|
|
temp1 = *(b + i * 2 + 0);
|
|
temp2 = *(b + i * 2 + 1);
|
|
temp3 = *(b + ip * 2 + 0);
|
|
temp4 = *(b + ip * 2 + 1);
|
|
*(b + i * 2 + 0) = temp3;
|
|
*(b + i * 2 + 1) = temp4;
|
|
*(b + ip * 2 + 0) = temp1;
|
|
*(b + ip * 2 + 1) = temp2;
|
|
}
|
|
}
|
|
|
|
ZTRSV_NLU(len, a, lda, b, 1, sb);
|
|
|
|
if (j < m) {
|
|
GEMV_N(m - j, j, 0, dm1, ZERO, a + j * 2, lda, b, 1, b + j * 2, 1, sb);
|
|
|
|
jp = j + IAMAX_K(m - j, b + j * 2, 1);
|
|
ipiv[j + offset] = jp + offset;
|
|
jp--;
|
|
|
|
temp1 = *(b + jp * 2 + 0);
|
|
temp2 = *(b + jp * 2 + 1);
|
|
|
|
if ((temp1 != ZERO) || (temp2 != ZERO)) {
|
|
|
|
if (jp != j) {
|
|
SWAP_K(j + 1, 0, 0, ZERO, ZERO, a + j * 2, lda,
|
|
a + jp * 2, lda, NULL, 0);
|
|
}
|
|
|
|
if (fabs(temp1) >= fabs(temp2)){
|
|
ratio = temp2 / temp1;
|
|
den = dp1 /(temp1 * ( 1 + ratio * ratio));
|
|
temp3 = den;
|
|
temp4 = -ratio * den;
|
|
} else {
|
|
ratio = temp1 / temp2;
|
|
den = dp1 /(temp2 * ( 1 + ratio * ratio));
|
|
temp3 = ratio * den;
|
|
temp4 = -den;
|
|
}
|
|
|
|
if (j + 1 < m) {
|
|
SCAL_K(m - j - 1, 0, 0, temp3, temp4,
|
|
b + (j + 1) * 2, 1, NULL, 0, NULL, 0);
|
|
}
|
|
} else {
|
|
if (!info) info = j + 1;
|
|
}
|
|
}
|
|
b += lda * 2;
|
|
}
|
|
return info;
|
|
|
|
}
|
|
|