[Bug 93447] [r600g] llvm crash because of use of uninitialized stack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93447

            Bug ID: 93447
           Summary: [r600g] llvm crash because of use of uninitialized
                    stack
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: notasas at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 120595
  --> https://bugs.freedesktop.org/attachment.cgi?id=120595&action=edit
hack patch

When replaying traces from Bug 92229 with R600_DEBUG=llvm specified a crash
will occur (on my system) in LLVMBuildInsertElement() because uninitialized
value in Index argument is passed. That value originates from
radeon_llvm_emit_prepare_cube_coords() function's coords[3] stack variable. At
that time,
 opcode = TGSI_OPCODE_TEX
 target = TGSI_TEXTURE_CUBE
so nothing ever sets coords[3], which is copied to the caller and eventually
finds it way to llvm.

Unfortunately I don't have any knowledge about that code, I hope somebody who
knows more can take a look. A hack patch is attached but it's most likely
wrong.

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