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Member "lapack-3.9.1/CBLAS/src/cblas_chpr.c" (25 Mar 2021, 2513 Bytes) of package /linux/misc/lapack-3.9.1.tar.gz:


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    1 /*
    2  * cblas_chpr.c
    3  * The program is a C interface to chpr.
    4  *
    5  * Keita Teranishi  3/23/98
    6  *
    7  */
    8 #include <stdio.h>
    9 #include <stdlib.h>
   10 #include "cblas.h"
   11 #include "cblas_f77.h"
   12 void cblas_chpr(const CBLAS_LAYOUT layout, const CBLAS_UPLO Uplo,
   13                 const CBLAS_INDEX N, const float alpha, const void *X,
   14                 const CBLAS_INDEX incX, void *A)
   15 {
   16    char UL;
   17 #ifdef F77_CHAR
   18    F77_CHAR F77_UL;
   19 #else
   20    #define F77_UL &UL
   21 #endif
   22 
   23 #ifdef F77_INT
   24    F77_INT F77_N=N, F77_incX=incX;
   25 #else
   26    #define F77_N N
   27    #define F77_incX incx
   28 #endif
   29    CBLAS_INDEX n, i, tincx, incx=incX;
   30    float *x=(float *)X, *xx=(float *)X, *tx, *st;
   31 
   32    extern int CBLAS_CallFromC;
   33    extern int RowMajorStrg;
   34    RowMajorStrg = 0;
   35 
   36    CBLAS_CallFromC = 1;
   37    if (layout == CblasColMajor)
   38    {
   39       if (Uplo == CblasLower) UL = 'L';
   40       else if (Uplo == CblasUpper) UL = 'U';
   41       else
   42       {
   43          cblas_xerbla(2, "cblas_chpr","Illegal Uplo setting, %d\n",Uplo );
   44          CBLAS_CallFromC = 0;
   45          RowMajorStrg = 0;
   46          return;
   47       }
   48       #ifdef F77_CHAR
   49          F77_UL = C2F_CHAR(&UL);
   50       #endif
   51 
   52       F77_chpr(F77_UL, &F77_N, &alpha, X, &F77_incX, A);
   53 
   54    }  else if (layout == CblasRowMajor)
   55    {
   56       RowMajorStrg = 1;
   57       if (Uplo == CblasUpper) UL = 'L';
   58       else if (Uplo == CblasLower) UL = 'U';
   59       else
   60       {
   61          cblas_xerbla(2, "cblas_chpr","Illegal Uplo setting, %d\n", Uplo);
   62          CBLAS_CallFromC = 0;
   63          RowMajorStrg = 0;
   64          return;
   65       }
   66       #ifdef F77_CHAR
   67          F77_UL = C2F_CHAR(&UL);
   68       #endif
   69       if (N > 0)
   70       {
   71          n = N << 1;
   72          x = malloc(n*sizeof(float));
   73          tx = x;
   74          if( incX > 0 ) {
   75             i = incX << 1;
   76             tincx = 2;
   77             st= x+n;
   78          } else {
   79             i = incX *(-2);
   80             tincx = -2;
   81             st = x-2;
   82             x +=(n-2);
   83          }
   84          do
   85          {
   86             *x = *xx;
   87             x[1] = -xx[1];
   88             x += tincx ;
   89             xx += i;
   90          }
   91          while (x != st);
   92          x=tx;
   93          #ifdef F77_INT
   94             F77_incX = 1;
   95          #else
   96             incx = 1;
   97          #endif
   98       }
   99       else x = (float *) X;
  100 
  101       F77_chpr(F77_UL, &F77_N, &alpha, x, &F77_incX, A);
  102 
  103    } else
  104    {
  105       cblas_xerbla(1, "cblas_chpr","Illegal layout setting, %d\n", layout);
  106       CBLAS_CallFromC = 0;
  107       RowMajorStrg = 0;
  108       return;
  109    }
  110    if(X!=x)
  111      free(x);
  112    CBLAS_CallFromC = 0;
  113    RowMajorStrg = 0;
  114    return;
  115 }