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

[bugzilla-dae...@freedesktop.org]

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

Michel Dänzer  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |WONTFIX

--- Comment #1 from Michel Dänzer  ---
(In reply to iive from comment #0)
> 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.

It's why it's disabled by default both at build time and at runtime. At this
point, it should only be enabled by someone who wants to work on fixing it.

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

[bugzilla-dae...@freedesktop.org]

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 at lists.freedesktop.org
  Reporter: ikalvachev at gmail.com
QA Contact: dri-devel at lists.freedesktop.org

Created attachment 118020
  --> https://bugs.freedesktop.org/attachment.cgi?id=118020=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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