150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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* cblas_chpr2.c
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* The program is a C interface to chpr2.
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*
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* Keita Teranishi 5/20/98
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "cblas.h"
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#include "cblas_f77.h"
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void cblas_chpr2(const CBLAS_LAYOUT layout, const CBLAS_UPLO Uplo,
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const int N,const void *alpha, const void *X,
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const int incX,const void *Y, const int incY, void *Ap)
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{
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char UL;
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#ifdef F77_CHAR
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F77_CHAR F77_UL;
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#else
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#define F77_UL &UL
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#endif
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#ifdef F77_INT
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F77_INT F77_N=N, F77_incX=incX, F77_incY=incY;
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#else
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#define F77_N N
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#define F77_incX incx
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#define F77_incY incy
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#endif
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int n, i, j, tincx, tincy, incx=incX, incy=incY;
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float *x=(float *)X, *xx=(float *)X, *y=(float *)Y,
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*yy=(float *)Y, *tx, *ty, *stx, *sty;
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extern int CBLAS_CallFromC;
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extern int RowMajorStrg;
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RowMajorStrg = 0;
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CBLAS_CallFromC = 1;
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if (layout == CblasColMajor)
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{
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if (Uplo == CblasLower) UL = 'L';
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else if (Uplo == CblasUpper) UL = 'U';
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else
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{
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cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n",Uplo );
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CBLAS_CallFromC = 0;
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RowMajorStrg = 0;
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return;
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}
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#ifdef F77_CHAR
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F77_UL = C2F_CHAR(&UL);
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#endif
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F77_chpr2(F77_UL, &F77_N, alpha, X, &F77_incX, Y, &F77_incY, Ap);
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} else if (layout == CblasRowMajor)
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{
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RowMajorStrg = 1;
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if (Uplo == CblasUpper) UL = 'L';
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else if (Uplo == CblasLower) UL = 'U';
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else
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{
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cblas_xerbla(2, "cblas_chpr2","Illegal Uplo setting, %d\n", Uplo);
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CBLAS_CallFromC = 0;
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RowMajorStrg = 0;
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return;
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}
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#ifdef F77_CHAR
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F77_UL = C2F_CHAR(&UL);
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#endif
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if (N > 0)
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{
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n = N << 1;
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x = malloc(n*sizeof(float));
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y = malloc(n*sizeof(float));
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tx = x;
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ty = y;
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if( incX > 0 ) {
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i = incX << 1 ;
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tincx = 2;
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stx= x+n;
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} else {
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i = incX *(-2);
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tincx = -2;
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stx = x-2;
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x +=(n-2);
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}
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if( incY > 0 ) {
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j = incY << 1;
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tincy = 2;
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sty= y+n;
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} else {
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j = incY *(-2);
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tincy = -2;
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sty = y-2;
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y +=(n-2);
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}
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do
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{
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*x = *xx;
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x[1] = -xx[1];
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x += tincx ;
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xx += i;
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}
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while (x != stx);
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do
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{
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*y = *yy;
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y[1] = -yy[1];
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y += tincy ;
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yy += j;
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}
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while (y != sty);
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x=tx;
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y=ty;
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#ifdef F77_INT
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F77_incX = 1;
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F77_incY = 1;
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#else
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incx = 1;
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incy = 1;
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#endif
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} else
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{
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x = (float *) X;
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y = (void *) Y;
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}
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F77_chpr2(F77_UL, &F77_N, alpha, y, &F77_incY, x, &F77_incX, Ap);
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} else
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{
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cblas_xerbla(1, "cblas_chpr2","Illegal layout setting, %d\n", layout);
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CBLAS_CallFromC = 0;
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RowMajorStrg = 0;
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return;
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}
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if(X!=x)
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free(x);
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if(Y!=y)
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free(y);
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CBLAS_CallFromC = 0;
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RowMajorStrg = 0;
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return;
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}
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