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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion failure when reordering shuffle and binary operation"
href="http://llvm.org/bugs/show_bug.cgi?id=19717">19717</a>
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<th>Summary</th>
<td>Assertion failure when reordering shuffle and binary operation
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>Hao.Liu@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This bug is introduced by the commit
<a href="http://llvm.org/viewvc/llvm-project?rev=208488&view=rev">http://llvm.org/viewvc/llvm-project?rev=208488&view=rev</a>
This patch tries to do the following transformation:
Op(shuffle(v1, m), shuffle(v2, m)) -> shuffle(Op(v1, v2), m)
But when v1 and v2 are different types, to create Op(v1, v2) may trigger
assertions.
To reproduce with following test case simple.ll:
-------------------------------------------------------------------------------
define <2 x i32> @dotest(<4 x i32> %in0, <2 x i32> %in1) {
entry:
%shuffle = shufflevector <4 x i32> %in0, <4 x i32> %in0, <2 x i32>
zeroinitializer
%shuffle4 = shufflevector <2 x i32> %in1, <2 x i32> %in1, <2 x i32>
zeroinitializer
%mul = mul <2 x i32> %shuffle, %shuffle4
ret <2 x i32> %mul
}
-------------------------------------------------------------------------------
Run with:
$opt -S -instcombine simple.ll
The error message is like:
opt: llvm/lib/IR/Instructions.cpp:1848: static llvm::BinaryOperator*
llvm::BinaryOperator::Create(llvm::Instruction::BinaryOps, llvm::Value*,
llvm::Value*, const llvm::Twine&, llvm::Instruction*): Assertion `S1->getType()
== S2->getType() && "Cannot create binary operator with two operands of
differing type!"' failed.</pre>
</div>
</p>
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