[Bug 90523] Easily reproducible GPU lockup (verde) with any mesa 10.5.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90523

--- Comment #7 from Michel Dänzer <michel at daenzer.net> ---
(In reply to acab from comment #6)
> Yes I could, however upsteam appears to maintain llvm in svn.
> There is a git repository as well but it lacks branches and tags.

The Git repository at http://llvm.org/git/llvm.git does have the release
branches. Also, the SVN revision number is included in the Git commit log, so
it's easy to find the Git commit corresponding to a given SVN revision e.g. in
gitk.


> r214336 | rafael.espindola | 2014-07-30 17:04:00 -0400 (Wed, 30 Jul 2014) |
> 9 lines
> 
> SimplifyCFG: Avoid miscompilations due to removed lifetime intrinsics.
> 
> Which appears to match commit 7fef5a3d1907c813712fcb2a44d8187a65ba08cd:
> [...]
> However mesa 10.5.5 doesn't build against that llvm (doesn't like
> TM->getSubtargetImpl()->getInstrInfo() in lp_bld_debug.cpp), but it does
> build against 3.5.2.

7fef5a3d1907c813712fcb2a44d8187a65ba08cd is on the master branch. The
corresponding commit on the release_35 branch is
a4cf325e41fca33c7ce7deef39a7bcf25fb38266.

However, as I mentioned before, you most likely will run into more similar
issues during the bisection, because Mesa can only test for minor versions of
LLVM, not for individual revisions. You may need to tweak the Mesa code to make
it build in some cases.

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