[Bug 111069] Assertion fails in nir_opt_remove_phis.c during compilation of SPIR-V shader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111069

            Bug ID: 111069
           Summary: Assertion fails in nir_opt_remove_phis.c during
                    compilation of SPIR-V shader
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: afdx at google.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

Created attachment 144702
  --> https://bugs.freedesktop.org/attachment.cgi?id=144702&action=edit
Amber test exposing the problem

Running the attached test using Amber (https://github.com/google/amber):

amber do-while-loop-in-conditionals.amber

should lead to the test passing.

Instead, an assertion fails:

amber: ../src/compiler/nir/nir_opt_remove_phis.c:115: remove_phis_block:
Assertion `def != NULL' failed.

Build: Mesa 19.2.0-devel (git-243db4980c) (Debug)
Device: Intel(R) HD Graphics 630 (Kaby Lake GT2)

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