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/*
BLIS
An object-based framework for developing high-performance BLAS-like
libraries.
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(s) of the copyright holder(s) 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.
*/
#include "blis.h"
//
// Define BLAS-like interfaces with typed operands.
//
#undef GENTFUNCR
#define GENTFUNCR( ctype, ctype_r, ch, chr, opname, arch, suf ) \
\
void PASTEMAC3(ch,opname,arch,suf) \
( \
dim_t n, \
ctype* restrict x, inc_t incx, \
dim_t* restrict i_max, \
cntx_t* restrict cntx \
) \
{ \
ctype_r* minus_one = PASTEMAC(chr,m1); \
dim_t* zero_i = PASTEMAC(i,0); \
\
ctype_r chi1_r; \
ctype_r chi1_i; \
ctype_r abs_chi1; \
ctype_r abs_chi1_max; \
dim_t i_max_l; \
\
/* If the vector length is zero, return early. This directly emulates
the behavior of netlib BLAS's i?amax() routines. */ \
if ( bli_zero_dim1( n ) ) \
{ \
PASTEMAC(i,copys)( *zero_i, *i_max ); \
return; \
} \
\
/* Initialize the index of the maximum absolute value to zero. */ \
PASTEMAC(i,copys)( *zero_i, i_max_l ); \
\
/* Initialize the maximum absolute value search candidate with
-1, which is guaranteed to be less than all values we will
compute. */ \
PASTEMAC(chr,copys)( *minus_one, abs_chi1_max ); \
\
if ( incx == 1 ) \
{ \
ctype* chi1 = x; \
\
for ( dim_t i = 0; i < n; ++i ) \
{ \
/* Get the real and imaginary components of chi1. */ \
PASTEMAC2(ch,chr,gets)( *chi1, chi1_r, chi1_i ); \
\
/* Replace chi1_r and chi1_i with their absolute values. */ \
PASTEMAC(chr,abval2s)( chi1_r, chi1_r ); \
PASTEMAC(chr,abval2s)( chi1_i, chi1_i ); \
\
/* Add the real and imaginary absolute values together. */ \
PASTEMAC(chr,set0s)( abs_chi1 ); \
PASTEMAC(chr,adds)( chi1_r, abs_chi1 ); \
PASTEMAC(chr,adds)( chi1_i, abs_chi1 ); \
\
/* If the absolute value of the current element exceeds that of
the previous largest, save it and its index. If NaN is
encountered, then treat it the same as if it were a valid
value that was smaller than any previously seen. This
behavior mimics that of LAPACK's ?lange(). */ \
if ( abs_chi1_max < abs_chi1 || ( bli_isnan( abs_chi1 ) && !bli_isnan( abs_chi1_max ) ) ) \
{ \
abs_chi1_max = abs_chi1; \
i_max_l = i; \
} \
\
chi1 += 1; \
} \
} \
else \
{ \
for ( dim_t i = 0; i < n; ++i ) \
{ \
ctype* chi1 = x + (i )*incx; \
\
/* Get the real and imaginary components of chi1. */ \
PASTEMAC2(ch,chr,gets)( *chi1, chi1_r, chi1_i ); \
\
/* Replace chi1_r and chi1_i with their absolute values. */ \
PASTEMAC(chr,abval2s)( chi1_r, chi1_r ); \
PASTEMAC(chr,abval2s)( chi1_i, chi1_i ); \
\
/* Add the real and imaginary absolute values together. */ \
PASTEMAC(chr,set0s)( abs_chi1 ); \
PASTEMAC(chr,adds)( chi1_r, abs_chi1 ); \
PASTEMAC(chr,adds)( chi1_i, abs_chi1 ); \
\
/* If the absolute value of the current element exceeds that of
the previous largest, save it and its index. If NaN is
encountered, then treat it the same as if it were a valid
value that was smaller than any previously seen. This
behavior mimics that of LAPACK's ?lange(). */ \
if ( abs_chi1_max < abs_chi1 || ( bli_isnan( abs_chi1 ) && !bli_isnan( abs_chi1_max ) ) ) \
{ \
abs_chi1_max = abs_chi1; \
i_max_l = i; \
} \
} \
} \
\
/* Store the final index to the output variable. */ \
PASTEMAC(i,copys)( i_max_l, *i_max ); \
}
INSERT_GENTFUNCR_BASIC2( amaxv, BLIS_CNAME_INFIX, BLIS_REF_SUFFIX )
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