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Description of problem:
On ppc64le and ppc64 machines that run with software rendering, the shader command to decrement a variable by 1 is never executed. This is because of a bug in the translation between tgsi and llvm ir for ppc64le and ppc64. 

Because this is such a basic command in shaders, it causes a lot of failures when running the piglit test suite

Version-Release number of selected component (if applicable):
mesa-10.6.5-1.20150824.el7

How reproducible:
By running various piglit tests. Around 350 tests fail because of this bug. It occurs 100% of the time

Steps to Reproduce:
1. Install piglit
2. Run bin/shader_runner tests/spec/glsl-1.30/execution/fs-decrement-int.shader_test -auto

Actual results:
The program returns "fail"

Expected results:
The program should return "success"

Fixed in mesa-10.6.5-2.20150824.el7

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2250.html