From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@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 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1085518686==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 1DDEF6E0BB for ; Tue, 7 Oct 2014 14:23:24 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1085518686== Content-Type: multipart/alternative; boundary="1412717004.15CFdc7A1.7410"; charset="UTF-8" --1412717004.15CFdc7A1.7410 Date: Tue, 7 Oct 2014 21:23:24 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=84232 --- Comment #2 from Vitaliy Filippov --- 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? -- You are receiving this mail because: You are the assignee for the bug. --1412717004.15CFdc7A1.7410 Date: Tue, 7 Oct 2014 21:23:24 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 2 on bug 84232 from 
Created attachment 107527 [details]
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?

You are receiving this mail because:
  • You are the assignee for the bug.
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