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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - select statement crashes wasm64 backend"
href="https://bugs.llvm.org/show_bug.cgi?id=41926">41926</a>
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<tr>
<th>Summary</th>
<td>select statement crashes wasm64 backend
</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>
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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>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: WebAssembly
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>husseydevin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>On LLVM versions 7.0 and later, this code causes a crash on the wasm64
backend.:
define i32 @foo(i32){
%2 = icmp sgt i32 %0, 15
%3 = select i1 %2, i32 0, i32 3
ret i32 %3
}
llc --mtriple=wasm64 test.ll
LLVM ERROR: Cannot select: 0x4f1608: i32 = select 0x4f1810, Constant:i32<0>,
Constant:i32<3>
0x4f1810: i64 = and 0x4f1740, Constant:i64<1>
0x4f1740: i64 = any_extend 0x4f1468
0x4f1468: i32 = WebAssemblyISD::ARGUMENT TargetConstant:i32<0>
0x4f1400: i32 = TargetConstant<0>
0x4f17a8: i64 = Constant<1>
0x4f1538: i32 = Constant<0>
0x4f15a0: i32 = Constant<3>
In function: foo
Ubuntu 18.04 LTS amd64 on WSL
Windows 10 Home 1903 x64
Dell Precision T3400
2.80 GHz Intel Core 2 Duo E7400
4 GB RAM
Known affected versions:
version 7.1.0~svn353565-1~exp1~20190406090509.61 from the
llvm-toolchain-bionic-7 apt repo
version 8.0.0 from releases.llvm.org
version 9.0.0-svn360862-1~exp1+0~20190516072237.984~1.gbp398e29 from the
llvm-toolchain-bionic apt repo</pre>
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</p>
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