当我用 编译以下文件时f2c
,它会失败并显示非信息性语法错误消息
f2c < ../../libcruft/blas-xtra/ddot3.f >ddot3.c
ddot3:
Error on line 37: syntax error
gfortran
编译它没有任何错误。你知道是什么原因造成的吗?你知道任何 fortran 编译器会很严格f2c
并且有很好的错误信息吗?
有问题的文件:
c Copyright (C) 2009-2012 VZLU Prague, a.s., Czech Republic
c
c Author: Jaroslav Hajek <highegg@gmail.com>
c
c This file is part of Octave.
c
c Octave is free software; you can redistribute it and/or modify
c it under the terms of the GNU General Public License as published by
c the Free Software Foundation; either version 3 of the License, or
c (at your option) any later version.
c
c This program is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c GNU General Public License for more details.
c
c You should have received a copy of the GNU General Public License
c along with this software; see the file COPYING. If not, see
c <http://www.gnu.org/licenses/>.
c
subroutine ddot3(m,n,k,a,b,c)
c purpose: a 3-dimensional dot product.
c c = sum (a .* b, 2), where a and b are 3d arrays.
c arguments:
c m,n,k (in) the dimensions of a and b
c a,b (in) double prec. input arrays of size (m,k,n)
c c (out) double prec. output array, size (m,n)
integer m,n,k,i,j,l
double precision a(m,k,n),b(m,k,n)
double precision c(m,n)
double precision ddot
external ddot
c quick return if possible.
if (m <= 0 .or. n <= 0) return
if (m == 1) then
c the column-major case.
do j = 1,n
c(1,j) = ddot(k,a(1,1,j),1,b(1,1,j),1)
end do
else
c We prefer performance here, because that's what we generally
c do by default in reduction functions. Besides, the accuracy
c of xDOT is questionable. Hence, do a cache-aligned nested loop.
do j = 1,n
do i = 1,m
c(i,j) = 0d0
end do
do l = 1,k
do i = 1,m
c(i,j) = c(i,j) + a(i,l,j)*b(i,l,j)
end do
end do
end do
end if
end subroutine