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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failure in WebAssemblyFastISel"
href="https://bugs.llvm.org/show_bug.cgi?id=47933">47933</a>
</td>
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<tr>
<th>Summary</th>
<td>Assertion failure in WebAssemblyFastISel
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>11.0
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jjorge@quarkslab.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24086" name="attach_24086" title="Output of the crash">attachment 24086</a> <a href="attachment.cgi?id=24086&action=edit" title="Output of the crash">[details]</a></span>
Output of the crash
When compiling the reduced test case below for the wasm32 target with
clang -target wasm32 -c test.ll -o /dev/null
Where test.ll is
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
define private void @failing(i32 %0) {
entry:
%1 = alloca i8, i32 4
%2 = ptrtoint i8* %1 to i32
%3 = and i32 %2, 2
%4 = add i32 %2, %3
%5 = inttoptr i32 %4 to i32*
store i32 %0, i32* %5
ret void
}
```
Clang fails with the following message:
llvm/lib/Target/WebAssembly/WebAssemblyFastISel.cpp:76: void (anonymous
namespace)::WebAssemblyFastISel::Address::setReg(unsigned int): Assertion
`isRegBase() && "Invalid base register access!"' failed.
See the attached log for details.</pre>
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