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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llc aborts on testcase"
href="http://llvm.org/bugs/show_bug.cgi?id=17868">17868</a>
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</tr>
<tr>
<th>Summary</th>
<td>llc aborts on testcase
</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>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vargaz@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11505" name="attach_11505" title="testcase">attachment 11505</a> <a href="attachment.cgi?id=11505&action=edit" title="testcase">[details]</a></span>
testcase
llc aborts with the following on the attached testcase:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Instruction does not dominate all uses!
%1 = add i64 %0, 1
%lsr = trunc i64 %1 to i32
Broken module found, compilation aborted!
<span class="quote">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>></span >
LLVM version: svn r194345
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
LLVM (<a href="http://llvm.org/">http://llvm.org/</a>):
LLVM version 3.4svn
DEBUG build with assertions.
Built Nov 8 2013 (23:07:17).
Default target: x86_64-apple-darwin13.0.0
Host CPU: corei7-avx
Registered Targets:
aarch64 - AArch64 (ARM 64-bit target)
arm - ARM
thumb - Thumb
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
<span class="quote">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>></span >
llc command line: llc bug.bc
It looks like the problem is introduced by the loop-reduce pass,
i.e.: llc -stop-after=loop-reduce -print-after-all shows:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
*** IR Dump After Print module to stderr ***; ModuleID = 'y.bc'
target triple = "x86_64-apple-darwin13.0.0"
define void @FOO() {
BB0:
br label %BB1
BB1: ; preds = %BB9, %BB0
%0 = sext i32 undef to i64
br i1 undef, label %BB5.preheader, label %BB9
BB5.preheader: ; preds = %BB1
br label %BB5
BB5: ; preds = %BB5.preheader,
%BB6
%indvars.iv = phi i64 [ %indvars.iv.next.pre-phi, %BB6 ], [ %0,
%BB5.preheader ]
%lsr1 = trunc i64 %indvars.iv to i32
%lsr = trunc i64 %indvars.iv.next.pre-phi to i32
%1 = add i64 %indvars.iv, 1
%.pre = trunc i64 %1 to i32
br i1 undef, label %BB7, label %BB6
.....
<span class="quote">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>></span >
At this line:
%lsr = trunc i64 %indvars.iv.next.pre-phi to i32
indvars.iv.next.pre-phi is not set when control goes
BB0->BB1->BB5.preheader->BB5.</pre>
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