src/gmxlib/gmx_blas/sscal.c

   1 #include "gmx_blas.h"
   2
   3 void
   4 F77_FUNC(sscal,SSCAL)(int  *n__,
   5                       float *fact__,
   6                       float *dx,
   7                       int   *incx__)
   8 {
   9     int nincx,i;
  10
  11     int n = *n__;
  12     float fact = *fact__;
  13     int incx = *incx__;
  14
  15     if(n<=0 || incx<=0)
  16         return;
  17
  18     if(incx==1) {
  19         /* Unrool factor 5 */
  20         for(i=0;i<(n-5);i+=5) {
  21             dx[i]   *= fact;
  22             dx[i+1] *= fact;
  23             dx[i+2] *= fact;
  24             dx[i+3] *= fact;
  25             dx[i+4] *= fact;
  26         }
  27         /* continue with current value of i */
  28         for(;i<n;i++)
  29             dx[i]   *= fact;
  30
  31         return;
  32     } else {
  33         /* inc != 1 */
  34         nincx = n * (incx);
  35         for (i=0;i<nincx;i+=incx)
  36             dx[i] *= fact;
  37
  38         return;
  39     }
  40
  41 }