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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LowerSwich pass asserts on 128-bit switch case value"
href="https://bugs.llvm.org/show_bug.cgi?id=52465">52465</a>
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<th>Summary</th>
<td>LowerSwich pass asserts on 128-bit switch case value
</td>
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>13.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Transformation Utilities
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>axel.cohen@eshard.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=25434" name="attach_25434" title="Assert backtrace">attachment 25434</a> <a href="attachment.cgi?id=25434&action=edit" title="Assert backtrace">[details]</a></span>
Assert backtrace
When a switch case with a 128-bit value is present in the IR, the LowerSwitch
pass triggers the following assert (backtrace attached):
int64_t llvm::APInt::getSExtValue() const: Assertion `getMinSignedBits() <= 64
&& "Too many bits for int64_t"' failed.
This behavior was observed applying the pass on IR generated by the Rust
compiler, but to simplify reproduction, i've attached a simple C code (and its
IR code) which reproduce the issue as well.
The bitcode is generated with:
clang -O0 -Xclang -disable-O0-optnone -emit-llvm -c switch.c -o switch.bc
The LowerSwitch pass is applied with:
opt -lowerswitch switch.bc -o out.bc</pre>
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