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 21:45:49 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1095065588==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 1998B8945A for ; Tue, 7 Oct 2014 14:45:49 -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 --===============1095065588== Content-Type: multipart/alternative; boundary="1412718348.fB6Be1.15835"; charset="UTF-8" --1412718348.fB6Be1.15835 Date: Tue, 7 Oct 2014 21:45:48 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=84232 --- Comment #3 from Matt Arsenault --- (In reply to Vitaliy Filippov from comment #2) > > 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? The StructurizeCFG pass can actually create branches on constants, although it shouldn't, which I've seen several times before. I've had a partial fix for SIAnnotateControlFlow handling branches on constants for a while, but I've been putting off fixing it until the less noticeable StructurizeCFG problem is fixed. -- You are receiving this mail because: You are the assignee for the bug. --1412718348.fB6Be1.15835 Date: Tue, 7 Oct 2014 21:45:48 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 3 on bug 84232 from 
(In reply to Vitaliy Filippov from comment #2)

> 
> 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?

The StructurizeCFG pass can actually create branches on constants, although it
shouldn't, which I've seen several times before. I've had a partial fix for
SIAnnotateControlFlow handling branches on constants for a while, but I've been
putting off fixing it until the less noticeable StructurizeCFG problem is
fixed.

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  • You are the assignee for the bug.
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