<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segmentation fault in NaryReassociate pass"
href="https://bugs.llvm.org/show_bug.cgi?id=37539">37539</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Segmentation fault in NaryReassociate pass
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>karl-johan.karlsson@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>When running the testcase:
-------------------------------------------------
; RUN: opt < %S -nary-reassociate -S -o /dev/null
define void @f1() {
br label %bb1
bb1: ; preds = %bb1, %0
%1 = phi i16 [ 0, %0 ], [ %3, %bb1 ]
%2 = phi i16 [ 0, %0 ], [ %4, %bb1 ]
%scevgep.offs = add i16 2, 0
%3 = add i16 %1, %scevgep.offs
%scevgep.offs5 = add i16 2, 0
%4 = add i16 %2, %scevgep.offs5
br i1 false, label %bb1, label %bb7
bb7: ; preds = %bb1
ret void
}
-------------------------------------------------
you end up with a segv.
$ ./opt -nary-reassociate -S -o - foo.ll
Stack dump:
0. Program arguments: ./opt -nary-reassociate -S -o - foo.ll
1. Running pass 'Function Pass Manager' on module 'foo.ll'.
2. Running pass 'Nary reassociation' on function '@f1'
#0 0x0000000002186074 PrintStackTraceSignalHandler(void*) (./opt+0x2186074)
#1 0x0000000002184350 llvm::sys::RunSignalHandlers() (./opt+0x2184350)
#2 0x00000000021863d8 SignalHandler(int) (./opt+0x21863d8)
#3 0x00007f707bea5330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x0000000002037ecd
llvm::NaryReassociatePass::doOneIteration(llvm::Function&) (./opt+0x2037ecd)
#5 0x000000000203ac08 (anonymous
namespace)::NaryReassociateLegacyPass::runOnFunction(llvm::Function&)
(./opt+0x203ac08)
#6 0x0000000001c19928 llvm::FPPassManager::runOnFunction(llvm::Function&)
(./opt+0x1c19928)
#7 0x0000000001c19b68 llvm::FPPassManager::runOnModule(llvm::Module&)
(./opt+0x1c19b68)
#8 0x0000000001c1a045 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(./opt+0x1c1a045)
#9 0x000000000077658c main (./opt+0x77658c)
#10 0x00007f707aa7ff45 __libc_start_main
/build/eglibc-ripdx6/eglibc-2.19/csu/libc-start.c:321:0
#11 0x000000000075fabd _start (./opt+0x75fabd)
Segmentation fault (core dumped)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>