1 /*
2 * cblas_chpr2.c
3 * The program is a C interface to chpr2.
4 *
5 * Keita Teranishi 5/20/98
6 *
7 */
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include "cblas.h"
11 #include "cblas_f77.h"
cblas_chpr2(const CBLAS_LAYOUT layout,const CBLAS_UPLO Uplo,const CBLAS_INDEX N,const void * alpha,const void * X,const CBLAS_INDEX incX,const void * Y,const CBLAS_INDEX incY,void * Ap)12 void cblas_chpr2(const CBLAS_LAYOUT layout, const CBLAS_UPLO Uplo,
13 const CBLAS_INDEX N,const void *alpha, const void *X,
14 const CBLAS_INDEX incX,const void *Y, const CBLAS_INDEX incY, void *Ap)
15
16 {
17 char UL;
18 #ifdef F77_CHAR
19 F77_CHAR F77_UL;
20 #else
21 #define F77_UL &UL
22 #endif
23
24 #ifdef F77_INT
25 F77_INT F77_N=N, F77_incX=incX, F77_incY=incY;
26 #else
27 #define F77_N N
28 #define F77_incX incx
29 #define F77_incY incy
30 #endif
31 CBLAS_INDEX n, i, j, tincx, tincy, incx=incX, incy=incY;
32 float *x=(float *)X, *xx=(float *)X, *y=(float *)Y,
33 *yy=(float *)Y, *tx, *ty, *stx, *sty;
34
35 extern int CBLAS_CallFromC;
36 extern int RowMajorStrg;
37 RowMajorStrg = 0;
38
39 CBLAS_CallFromC = 1;
40 if (layout == CblasColMajor)
41 {
42 if (Uplo == CblasLower) UL = 'L';
43 else if (Uplo == CblasUpper) UL = 'U';
44 else
45 {
46 cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n",Uplo );
47 CBLAS_CallFromC = 0;
48 RowMajorStrg = 0;
49 return;
50 }
51 #ifdef F77_CHAR
52 F77_UL = C2F_CHAR(&UL);
53 #endif
54
55 F77_chpr2(F77_UL, &F77_N, alpha, X, &F77_incX, Y, &F77_incY, Ap);
56
57 } else if (layout == CblasRowMajor)
58 {
59 RowMajorStrg = 1;
60 if (Uplo == CblasUpper) UL = 'L';
61 else if (Uplo == CblasLower) UL = 'U';
62 else
63 {
64 cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n", Uplo);
65 CBLAS_CallFromC = 0;
66 RowMajorStrg = 0;
67 return;
68 }
69 #ifdef F77_CHAR
70 F77_UL = C2F_CHAR(&UL);
71 #endif
72 if (N > 0)
73 {
74 n = N << 1;
75 x = malloc(n*sizeof(float));
76 y = malloc(n*sizeof(float));
77 tx = x;
78 ty = y;
79 if( incX > 0 ) {
80 i = incX << 1 ;
81 tincx = 2;
82 stx= x+n;
83 } else {
84 i = incX *(-2);
85 tincx = -2;
86 stx = x-2;
87 x +=(n-2);
88 }
89
90 if( incY > 0 ) {
91 j = incY << 1;
92 tincy = 2;
93 sty= y+n;
94 } else {
95 j = incY *(-2);
96 tincy = -2;
97 sty = y-2;
98 y +=(n-2);
99 }
100
101 do
102 {
103 *x = *xx;
104 x[1] = -xx[1];
105 x += tincx ;
106 xx += i;
107 }
108 while (x != stx);
109 do
110 {
111 *y = *yy;
112 y[1] = -yy[1];
113 y += tincy ;
114 yy += j;
115 }
116 while (y != sty);
117
118 x=tx;
119 y=ty;
120
121 #ifdef F77_INT
122 F77_incX = 1;
123 F77_incY = 1;
124 #else
125 incx = 1;
126 incy = 1;
127 #endif
128
129 } else
130 {
131 x = (float *) X;
132 y = (void *) Y;
133 }
134 F77_chpr2(F77_UL, &F77_N, alpha, y, &F77_incY, x, &F77_incX, Ap);
135 } else
136 {
137 cblas_xerbla(1, "cblas_chpr2","Illegal layout setting, %d\n", layout);
138 CBLAS_CallFromC = 0;
139 RowMajorStrg = 0;
140 return;
141 }
142 if(X!=x)
143 free(x);
144 if(Y!=y)
145 free(y);
146 CBLAS_CallFromC = 0;
147 RowMajorStrg = 0;
148 return;
149 }
150