bugGNU Scientific Library - Bugs: bug #39171, make check errors with gcc...

 
 

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bug #39171: make check errors with gcc -ffast-math (or default Intel icc)

Submitted by:  Patrick Alken <psa>
Submitted on:  Wed 05 Jun 2013 09:14:48 PM UTC  
 
Category: PerformanceSeverity: 3 - Normal
Operating System: Status: Confirmed
Assigned to: NoneOpen/Closed: Open
Release: 

Wed 05 Jun 2013 09:14:48 PM UTC, original submission:

GSL will not pass make check with the -ffast-math flag passed to gcc. Similarly, Intel's icc default configuration for -O2 includes -ffast-math behavior and also fails (see bug #39152).

The document https://secure-software.intel.com/sites/default/files/article/326703/fp-control-2012-08.pdf contains a decent description of the various optimizations turned on by -ffast-math and the default icc configuration.

Getting GSL to pass make check with -ffast-math will most likely be a long and difficult project, involving rewrites of various routines to perform more consistently with these optimizations.

It is unclear if the effort is worth the reward, but this bug can be left open to track the issue.

Patrick Alken <psa>
Project Administrator

 

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