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Re: [Help-gsl] compiler fast math options

From: Brian Gough
Subject: Re: [Help-gsl] compiler fast math options
Date: Tue, 1 Mar 2005 16:45:07 +0000

Nathan Moore writes:
 > I'm working on a project which will use GSL integration routines and 
 > random number generators.  In the interest of code execution speed, I'm 
 > wondering if GSL is picky about the standard Math library.  
 > Specifically, I've read in the past that if you're not concerned about 
 > (1) the inclusion of extra precision or (2) you code doesn't rely on an 
 > error flag when it encounters something like sqrt(-3.25) then there' is 
 > no real risk in enabling the "fast-math" option in the compiler.

The -ffast-math option is not recommended for use with GSL.  If you
build the library with that option the "make check" test suite will


Brian Gough

Network Theory Ltd,
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