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From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend
Date: Tue, 07 Oct 2014 21:23:24 +0000	[thread overview]
Message-ID: <bug-84232-502-RFUBosrCFK@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-84232-502@http.bugs.freedesktop.org/>


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https://bugs.freedesktop.org/show_bug.cgi?id=84232

--- Comment #2 from Vitaliy Filippov <vitalif@yourcmc.ru> ---
Created attachment 107527
  --> https://bugs.freedesktop.org/attachment.cgi?id=107527&action=edit
Attempt to reduce testcase using bugpoint

Tried to reduce the case using bugpoint:

PATH=/usr/lib/llvm-3.5/bin/:$PATH bugpoint-3.5 kernel.ll --llc-safe --tool-args
-- -march=r600 -mcpu=oland

The result leads to other crash, maybe it's also a bug, but it's definitely
another bug:

llc-3.5 -march=r600 -mcpu=oland bugpoint-reduced-simplified.ll

Which leads to a segfault on a non-assert build and to the following message on
a release+asserts build:

Unhandled loop condition!
UNREACHABLE executed at
/var/home/vitali/setup/llvm-toolchain-3.5-3.5/lib/Target/R600/SIAnnotateControlFlow.cpp:259!

This is probably related to bugpoint replacing the branch conditions with
constants, which makes conditional branches effectively unconditional :) and
SIAnnotateControlFlow::handleLoopCondition also doesn't handle this case.

Looks like an easy to fix problem?

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  parent reply	other threads:[~2014-10-07 21:23 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-23  9:19 [Bug 84232] New: PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend bugzilla-daemon
2014-09-23  9:19 ` [Bug 84232] " bugzilla-daemon
2014-09-23 13:19 ` bugzilla-daemon
2014-10-07 21:23 ` bugzilla-daemon [this message]
2014-10-07 21:45 ` bugzilla-daemon
2014-10-07 22:23 ` bugzilla-daemon
2014-10-08 20:56 ` bugzilla-daemon
2014-10-09  8:22 ` bugzilla-daemon
2014-10-10 15:48 ` bugzilla-daemon
2014-10-10 20:31 ` bugzilla-daemon
2014-10-10 21:36 ` bugzilla-daemon
2014-10-22 23:07 ` bugzilla-daemon
2014-10-22 23:08 ` bugzilla-daemon
2014-10-22 23:16 ` bugzilla-daemon
2014-10-23  9:12 ` bugzilla-daemon
2014-12-05 15:44 ` bugzilla-daemon
2014-12-08 16:57 ` bugzilla-daemon
2014-12-08 21:11 ` bugzilla-daemon
2017-03-22 16:00 ` bugzilla-daemon
2017-03-22 16:00 ` bugzilla-daemon
2018-04-03  3:49 ` bugzilla-daemon

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