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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to select SIMD instructions for wasm64-unknown-unknown"
href="https://bugs.llvm.org/show_bug.cgi?id=52350">52350</a>
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<th>Summary</th>
<td>Failure to select SIMD instructions for wasm64-unknown-unknown
</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>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: WebAssembly
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I was curious to poke around at wasm64-unknown-unknown support for Rust
recently and I ran into a crash with SIMD test cases which I was able to reduce
to:
target triple = "wasm64-unknown-unknown"
define void @foo(<4 x i32> * %a, i32* %b) #0 {
store <4 x i32> zeroinitializer, <4 x i32>* %a, align 16
%1 = load <4 x i32>, <4 x i32>* %a, align 16
%2 = extractelement <4 x i32> %1, i32 0
store i32 %2, i32* %b, align 4
ret void
}
attributes #0 = { "target-features"="+simd128" }
which crashes with:
$ llc -filetype=obj -O2 -o foo.o ./bugpoint-reduced-simplified.ll
LLVM ERROR: Cannot select: t11: i32 = extract_vector_elt t6, Constant:i64<0>
t6: v4i32 = BUILD_VECTOR Constant:i32<0>, Constant:i32<0>, Constant:i32<0>,
Constant:i32<0>
t5: i32 = Constant<0>
t5: i32 = Constant<0>
t5: i32 = Constant<0>
t5: i32 = Constant<0>
t7: i64 = Constant<0>
In function: foo
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace.
Stack dump:
0. Program arguments: ../rust/build/aarch64-unknown-linux-gnu/llvm/bin/llc
-filetype=obj -O2 -o foo.o ./bugpoint-reduced-simplified.ll
1. Running pass 'Function Pass Manager' on module
'./bugpoint-reduced-simplified.ll'.
2. Running pass 'WebAssembly Instruction Selection' on function '@foo'</pre>
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