LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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lapacke_sgesvd_work.c
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1/*****************************************************************************
2 Copyright (c) 2014, Intel Corp.
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
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8 * Redistributions of source code must retain the above copyright notice,
9 this list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
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13 * Neither the name of Intel Corporation nor the names of its contributors
14 may be used to endorse or promote products derived from this software
15 without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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28*****************************************************************************
29* Contents: Native middle-level C interface to LAPACK function sgesvd
30* Author: Intel Corporation
31*****************************************************************************/
32
33#include "lapacke_utils.h"
34
35lapack_int LAPACKE_sgesvd_work( int matrix_layout, char jobu, char jobvt,
36 lapack_int m, lapack_int n, float* a,
37 lapack_int lda, float* s, float* u,
38 lapack_int ldu, float* vt, lapack_int ldvt,
39 float* work, lapack_int lwork )
40{
41 lapack_int info = 0;
42 if( matrix_layout == LAPACK_COL_MAJOR ) {
43 /* Call LAPACK function and adjust info */
44 LAPACK_sgesvd( &jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt,
45 work, &lwork, &info );
46 if( info < 0 ) {
47 info = info - 1;
48 }
49 } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
50 lapack_int nrows_u = ( LAPACKE_lsame( jobu, 'a' ) ||
51 LAPACKE_lsame( jobu, 's' ) ) ? m : 1;
52 lapack_int ncols_u = LAPACKE_lsame( jobu, 'a' ) ? m :
53 ( LAPACKE_lsame( jobu, 's' ) ? MIN(m,n) : 1);
54 lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'a' ) ? n :
55 ( LAPACKE_lsame( jobvt, 's' ) ? MIN(m,n) : 1);
56 lapack_int ncols_vt = ( LAPACKE_lsame( jobvt, 'a' ) ||
57 LAPACKE_lsame( jobvt, 's' ) ) ? n : 1;
58 lapack_int lda_t = MAX(1,m);
59 lapack_int ldu_t = MAX(1,nrows_u);
60 lapack_int ldvt_t = MAX(1,nrows_vt);
61 float* a_t = NULL;
62 float* u_t = NULL;
63 float* vt_t = NULL;
64 /* Check leading dimension(s) */
65 if( lda < n ) {
66 info = -7;
67 LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
68 return info;
69 }
70 if( ldu < ncols_u ) {
71 info = -10;
72 LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
73 return info;
74 }
75 if( ldvt < ncols_vt ) {
76 info = -12;
77 LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
78 return info;
79 }
80 /* Query optimal working array(s) size if requested */
81 if( lwork == -1 ) {
82 LAPACK_sgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
83 &ldvt_t, work, &lwork, &info );
84 return (info < 0) ? (info - 1) : info;
85 }
86 /* Allocate memory for temporary array(s) */
87 a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
88 if( a_t == NULL ) {
90 goto exit_level_0;
91 }
92 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
93 u_t = (float*)
94 LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,ncols_u) );
95 if( u_t == NULL ) {
97 goto exit_level_1;
98 }
99 }
100 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
101 vt_t = (float*)LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
102 if( vt_t == NULL ) {
104 goto exit_level_2;
105 }
106 }
107 /* Transpose input matrices */
108 LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
109 /* Call LAPACK function and adjust info */
110 LAPACK_sgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
111 &ldvt_t, work, &lwork, &info );
112 if( info < 0 ) {
113 info = info - 1;
114 }
115 /* Transpose output matrices */
116 LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
117 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
118 LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
119 u, ldu );
120 }
121 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
122 LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
123 ldvt );
124 }
125 /* Release memory and exit */
126 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
127 LAPACKE_free( vt_t );
128 }
129exit_level_2:
130 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
131 LAPACKE_free( u_t );
132 }
133exit_level_1:
134 LAPACKE_free( a_t );
135exit_level_0:
136 if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
137 LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
138 }
139 } else {
140 info = -1;
141 LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
142 }
143 return info;
144}
#define LAPACK_sgesvd(...)
Definition: lapack.h:3427
#define lapack_int
Definition: lapack.h:87
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
lapack_int LAPACKE_sgesvd_work(int matrix_layout, char jobu, char jobvt, lapack_int m, lapack_int n, float *a, lapack_int lda, float *s, float *u, lapack_int ldu, float *vt, lapack_int ldvt, float *work, lapack_int lwork)
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
void LAPACKE_xerbla(const char *name, lapack_int info)
#define MIN(x, y)
Definition: lapacke_utils.h:49
void LAPACKE_sge_trans(int matrix_layout, lapack_int m, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
#define MAX(x, y)
Definition: lapacke_utils.h:46