[Bug 91828] R600 LLVM Assertion in Instructions.cpp:1499

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91828

            Bug ID: 91828
           Summary: R600 LLVM Assertion in Instructions.cpp:1499
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: ikalvachev@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 118020
  --> https://bugs.freedesktop.org/attachment.cgi?id=118020&action=edit
Log of running Xonotic with R600_DEBUG=llvm,ps,vs. The last shader causes
assertion.

This bug happen with wide variety of games. I managed to reproduce it with the
free Xonotic v0.8.1. The exact command is
`R600_DEBUG=llvm,ps,vs ./xonotic-linux32-glx`.
(Then start the first single player map. Crash happens at first in-game frame.)

The error I get is:
---
xonotic-linux32-glx: Instructions.cpp:1499:
llvm::InsertElementInst::InsertElementInst(llvm::Value *, llvm::Value *,
llvm::Value *, const llvm::Twine &, llvm::Instruction *): Assertion
`isValidOperands(Vec, Elt, Index) && "Invalid insertelement instruction
operands!"' failed.
---

I've obtained that error by compiling debug versions of LLVM 3.6.2 and current
git of Mesa. Unfortunately the backtrace doesn't produce any relevant info.

I'm reporting the bug here, because the error happens during the phase where
TGSI code is translated into the intrinsics that LLVM understand. I do not see
llvm intrinsics code for the last TGSI shader, so I cannot reproduce the crash
with `llc`. I think it is quite likely that the problem is caused by some LLVM
API change, that have not been reflected in Mesa.

I know that R600 LLVM is not under active development. However at the moment
that code is crashing on regular basis. Mesa should be able to work with any
recent LLVM release and 3.6.2 is the latest current release. If you do not
intend to maintain it, then you might consider removing it.

I would prefer the bug(s) to be fixed. Nine exposes quite a number of SB bugs
and having other options is always good for testing.

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