[Bug 101360] Assertion failure comparing result of ballotARB

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101360

            Bug ID: 101360
           Summary: Assertion failure comparing result of ballotARB
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: glsl-compiler
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: jlegg at feralinteractive.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 131825
  --> https://bugs.freedesktop.org/attachment.cgi?id=131825&action=edit
Piglit test reproducing the problem

When comparing a constant to the result of a call to the ballotARB function, or
a variable containing the result, an assert in void
glsl_to_tgsi_visitor::copy_propagate() can fail. If assertions are disabled,
then copy_propagate writes over the end of an allocation, corrupting memory
instead.

The attached patch to piglit adds a test reproducing the problem.

Steps to reproduce:
 1) Apply attached patch to piglit
 2) Run ./piglit run -t arb_shader_ballot shader results/ballot
    The newly added test will crash.

The test crashes with:
state_tracker/st_glsl_to_tgsi.cpp:4936: void
glsl_to_tgsi_visitor::copy_propagate(): Assertion `inst->dst[0].file !=
PROGRAM_TEMPORARY || inst->dst[0].index < this->next_temp' failed.

I'm using mesa ada3c3aa3da5d04bd597014dc1b5d4b028313513 with an AMD RX480.

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