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Member "lapack-3.9.1/CBLAS/src/cblas_chpr2.c" (25 Mar 2021, 3294 Bytes) of package /linux/misc/lapack-3.9.1.tar.gz:


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    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"
   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 }