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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion failure when replacing shuffle vectors in Instruction Combine"
href="http://llvm.org/bugs/show_bug.cgi?id=19730">19730</a>
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<th>Summary</th>
<td>Assertion failure when replacing shuffle vectors in Instruction Combine
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<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 is introduced by r208488 related to 19717
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Assertion failure when reordering shuffle and binary operation"
href="show_bug.cgi?id=19717">http://llvm.org/bugs/show_bug.cgi?id=19717</a>.
When two shuffles have different types, an assertion failure may happen. To
reproduce with following case simple.ll:
---------------------------------------------------------------------------------
define <8 x i8> @test(<16 x i8> %in0) {
entry:
%shuffle = shufflevector <16 x i8> %in0, <16 x i8> undef, <8 x i32> <i32 7,
i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
%shuffle1 = shufflevector <8 x i8> %shuffle, <8 x i8> undef, <8 x i32> <i32
7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
ret <8 x i8> %shuffle1
}
---------------------------------------------------------------------------------
To run as following:
$opt -S -instcombine simple.ll
opt: llvm/lib/IR/Value.cpp:309: void
llvm::Value::replaceAllUsesWith(llvm::Value*): Assertion `New->getType() ==
getType() && "replaceAllUses of value with new value of different type!"'
failed.</pre>
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