[Mesa-dev] [Bug 108065] Launching SteamVR results in nir_deref_instr_remove_if_unused assert

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108065

            Bug ID: 108065
           Summary: Launching SteamVR results in
                    nir_deref_instr_remove_if_unused assert
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/radeon
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: andresx7 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

When launching SteamVR, the vrcompositor process hits the following assert:

vrcompositor: ../src/compiler/nir/nir_deref.c:95:
nir_deref_instr_remove_if_unused: Assertion `d->dest.is_ssa' failed.

This regression started with the change:
864c78 "nir/opt_if: Re-materialize derefs in use blocks before peeling loops"

https://gitlab.freedesktop.org/mesa/mesa/commit/864c780566b8782c4fc69b4337db768223717bd8

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