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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt crashes with -aggressive-instcombine: ../lib/Transforms/AggressiveInstCombine/TruncInstCombine.cpp:296: llvm::Value *llvm::TruncInstCombine::getReducedOperand(llvm::Value *, llvm::Type *): Assertion `Entry.NewValue' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=36134">36134</a>
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<th>Summary</th>
<td>opt crashes with -aggressive-instcombine: ../lib/Transforms/AggressiveInstCombine/TruncInstCombine.cpp:296: llvm::Value *llvm::TruncInstCombine::getReducedOperand(llvm::Value *, llvm::Type *): Assertion `Entry.NewValue' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=19763" name="attach_19763" title="reproducer">attachment 19763</a> <a href="attachment.cgi?id=19763&action=edit" title="reproducer">[details]</a></span>
reproducer
Running:
opt -S -o - reduced.ll -aggressive-instcombine
Gives:
opt: ../lib/Transforms/AggressiveInstCombine/TruncInstCombine.cpp:296:
llvm::Value *llvm::TruncInstCombine::getReducedOperand(llvm::Value *,
llvm::Type *): Assertion `Entry.NewValue' failed.
This happens even with the patch
<a href="https://reviews.llvm.org/D42622">https://reviews.llvm.org/D42622</a>
applied.
The input looks like:
define void @func_20() {
for.body94:
unreachable
for.cond641:
%or722 = or i32 %or722, undef
%or723 = or i32 %or722, 1
%conv724 = trunc i32 %or723 to i16
br label %for.cond641
}
which is kind of weird since %for.cond641 is unreachable from the entry.
This kind of code can be produced by jump-threading though.</pre>
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