From bug-request at octave dot org Wed Jan 11 21:03:03 2006
Subject: Compiling octave with Intel C++/Fortran compilers on Linux
From: "Tetsuji \"Maverick\" Rai" <maverick31337 at gmail dot com>
To: bug at octave dot org
Date: Thu, 12 Jan 2006 12:01:26 +0900

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Hi,

I've successfully compiled octave with Intel C++/Fortran compiler on
Gentoo Linux on P4 to make it faster and probably more accurate (because
it's more accurate than gcc-3.4.4 with proper options.)  But I needed a
tweak, so I write diff here.

It's in src/oct-stream.cc, and the diff for 2.1.72 is

*** ../../octave-2.1.72/src/oct-stream.cc       Sat Nov 12 04:48:27 2005
- ---- ./oct-stream.cc     Thu Jan 12 05:47:20 2006
***************
*** 1143,1148 ****
- ---- 1143,1149 ----
  octave_scan (std::istream&, const scanf_format_elt&, float*);
  #endif

+ #if !defined(__INTEL_COMPILER) // TMR
  template <>
  std::istream&
  octave_scan (std::istream& is, const scanf_format_elt& fmt, double*
valptr)
***************
*** 1317,1323 ****

    return is;
  }
!
  template std::istream&
  octave_scan (std::istream&, const scanf_format_elt&, double*);

- ---- 1318,1324 ----

    return is;
  }
! #endif //TMR
  template std::istream&
  octave_scan (std::istream&, const scanf_format_elt&, double*);


In order to compile octave with Intel C++ 9.0/Fortran 9.0, at first
install these compilers (as a matter of course!) and set these
environment variables:

export CC=icc
export CFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
export CXX=icpc
export CXXFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
export F77=ifort
export FFLAGS='-O3 -mp -xP -ip -I/usr/local/include'
export LDFLAGS='-L/usr/local/lib -lsvml'

Last "-L/usr/local/lib" specifies the location of fftw library.  Then
./configure and make as usual.  In these options, -mp option keeps ieee
compliant accuracy (by default, fortran compiler isn't given -mieee-fp
option) -xP specifies sse3 (so one has to change it to -xW for sse2, -xK
for sse), and -ip for single file interprocedural optimization.  I also
tried -ipo[n] flag, but I found octave was too large to utilize that
option; it took too long to link octave.   -ipo[large number] may work
(I'm trying,) but in that case, one needs to set "export AR=xiar" also.

fftw can also be compiled with these options to make it faster.

regards,


- --
Tetsuji 'Maverick' Rai
main page http://maverick6664.bravehost.com/
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