160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
/*
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* cblas_chbmv.c
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* The program is a C interface to chbmv
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*
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* Keita Teranishi 5/18/98
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*
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*/
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#include "cblas.h"
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#include "cblas_f77.h"
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#include <stdio.h>
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#include <stdlib.h>
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void cblas_chbmv(const CBLAS_LAYOUT layout,
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const CBLAS_UPLO Uplo,const int N,const int K,
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const void *alpha, const void *A, const int lda,
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const void *X, const int incX, const void *beta,
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void *Y, const int incY)
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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_K=K, F77_lda=lda, 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_K K
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#define F77_lda lda
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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=0, incx=incX;
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const float *xx= (float *)X, *alp= (float *)alpha, *bet = (float *)beta;
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float ALPHA[2],BETA[2];
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int tincY, tincx;
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float *x=(float *)X, *y=(float *)Y, *st=0, *tx;
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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_chbmv","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_chbmv(F77_UL, &F77_N, &F77_K, alpha, A, &F77_lda, X,
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&F77_incX, beta, Y, &F77_incY);
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}
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else if (layout == CblasRowMajor)
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{
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RowMajorStrg = 1;
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ALPHA[0]= *alp;
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ALPHA[1]= -alp[1];
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BETA[0]= *bet;
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BETA[1]= -bet[1];
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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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tx = x;
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if( incX > 0 ) {
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i = incX << 1 ;
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tincx = 2;
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st= x+n;
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} else {
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i = incX *(-2);
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tincx = -2;
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st = x-2;
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x +=(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 != st);
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x=tx;
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#ifdef F77_INT
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F77_incX = 1;
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#else
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incx = 1;
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#endif
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if(incY > 0)
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tincY = incY;
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else
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tincY = -incY;
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y++;
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i = tincY << 1;
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n = i * N ;
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st = y + n;
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do {
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*y = -(*y);
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y += i;
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} while(y != st);
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y -= n;
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} else
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x = (float *) X;
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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_chbmv","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_chbmv(F77_UL, &F77_N, &F77_K, ALPHA,
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A ,&F77_lda, x,&F77_incX, BETA, Y, &F77_incY);
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}
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else
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{
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cblas_xerbla(1, "cblas_chbmv","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 ( layout == CblasRowMajor )
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{
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RowMajorStrg = 1;
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if(X!=x)
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free(x);
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if (N > 0)
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{
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do
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{
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*y = -(*y);
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y += i;
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}
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while (y != st);
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}
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}
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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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