diff options
Diffstat (limited to 'blas/double.cpp')
-rw-r--r-- | blas/double.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/blas/double.cpp b/blas/double.cpp index cad2f63ec..9b53be484 100644 --- a/blas/double.cpp +++ b/blas/double.cpp @@ -2,6 +2,7 @@ // for linear algebra. // // Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr> +// Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net> // // This Source Code Form is subject to the terms of the Mozilla // Public License v. 2.0. If a copy of the MPL was not distributed @@ -17,3 +18,21 @@ #include "level2_impl.h" #include "level2_real_impl.h" #include "level3_impl.h" + +// currently used by DSDOT only +double* cast_vector_to_double(float* x, int n, int incx) +{ + double* ret = new double[n]; + if(incx<0) vector(ret,n) = vector(x,n,-incx).reverse().cast<double>(); + else vector(ret,n) = vector(x,n, incx).cast<double>(); + return ret; +} + +double BLASFUNC(dsdot)(int* n, float* px, int* incx, float* py, int* incy) +{ + if(*n <= 0) return 0; + double* x = cast_vector_to_double(px, *n, *incx); + double* y = cast_vector_to_double(py, *n, *incy); + return vector(x,*n).cwiseProduct(vector(y,*n)).sum(); +} + |