bugGNU Scientific Library - Bugs: bug #49697, gsl 2.2.1 linalg test fails with...

 
 

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bug #49697: gsl 2.2.1 linalg test fails with gcc (4.9.4 and later) and -mavx

Submitted by:  Patrick Alken <psa>
Submitted on:  Thu 24 Nov 2016 05:43:55 PM UTC  
 
Category:  None Severity:  3 - Normal
Operating System:  Status:  None
Assigned to:  None Open/Closed:  Open
Release: 

Thu 24 Nov 2016 05:43:55 PM UTC, original submission:

from pgfogli =at= gmx =dot= com

gsl 2.2.1 linalg test fails with gcc (4.9.4 and later) and -mavx :

======================================
gsl 2.2.1: linalg/test-suite.log
======================================
# TOTAL: 1
# PASS: 0
# SKIP: 0
# XFAIL: 0
# FAIL: 1
# XPASS: 0
# ERROR: 0
.. contents:: :depth: 2
FAIL: test
==========
FAIL: cholesky_decomp unscaled hilbert rcond: ( 7, 7): 1.01502759282973088e-09 1.01502759382300005e-09
(1.01502759282973088e-09 observed vs 1.01502759382300005e-09 expected) [272191]
FAIL: cholesky_decomp unscaled hilbert rcond: ( 8, 8): 2.95222156993476919e-11 2.95222163060200025e-11
(2.95222156993476919e-11 observed vs 2.95222163060200025e-11 expected) [272433]
FAIL: pcholesky_invert unscaled hilbert ( 4, 4)[0,2]: -2.55795384873636067e-13 0
(-2.55795384873636067e-13 observed vs 0 expected) [533911]
FAIL: mcholesky_invert unscaled hilbert ( 4, 4)[0,2]: -2.55795384873636067e-13 0
(-2.55795384873636067e-13 observed vs 0 expected) [672592]

The test fails on macOS 10.12.1 Sierra (Intel Core i7 Hasswell) with gcc (4.9.4, 5.4.0 and 6.2.0)
and clang (3.9.0) integrated assembler from MacPorts when given the compiler option -mavx.
I tested several compiler options and the failure seems triggered by -mavx.
For example the test pass with -mno-avx -mavx2.
I was able to reproduce the problem under cygwin with gcc 5.4.0 .
The test pass with gcc 4.8.5 under Linux (2.6.32 kernel, Intel Xeon E5 Sandy Bridge).
Unfortunately I do not have a more recent Linux/gcc at hand.

Patrick Alken <psa>
Project Administrator

 

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