test-gtc_packing fails on i686

[muep]

Seems to happen with all 0.9.5* versions.

Steps to reproduce on GCC 4.8 on GNU/Linux, starting with PWD at the glm repository root

mkdir build
cd build
g++ -m32 -O2 -Wall -I .. ../test/gtc/gtc_packing.cpp
./a.out ; echo $?

The resulting test program exits with value 6, failing the test set.

So far, I have only had this happen on i686. Also it does not happen with -O1.

[muep]

Just as an additional note, the issue does not seem to affect either of clang 3.4 of Fedora 20 and clang 3.4.1 of Fedora rawhide.

[Groovounet]

Hi,

I think I fixed the issue but I could not reproduce the bug.
Let me know if this is working for you now.

Thanks,
Christophe

[muep]

Hello,

The problem still persists for me on i686, at least with commits 6f59e64 and 4fa38c7.

It is nice that the aliasing issues got fixed, though.

[Groovounet]

Damn, that bug is going to be a bummer. :/

[muep]

Just a note that this issue is still present with GCC 4.9 as shipped in Fedora 21.

The issue does not appear if the -ffloat-store option is passed to GCC.

[Groovounet]

I finally figured the problem with this issue: Denorms!

This issue is fixed in master and 0.9.8 branches for GLM 0.9.8.4 release.

Thanks for reporting,
Christophe