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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [AArch64][StrctFP] constrained.fptrunc.f32.f64 crashes on AArch64"
href="https://bugs.llvm.org/show_bug.cgi?id=43209">43209</a>
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<th>Summary</th>
<td>[AArch64][StrctFP] constrained.fptrunc.f32.f64 crashes on AArch64
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Common Code Generator Code
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>craig.topper@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>The following test case crashes on AArch64. FP_ROUND is marked Custom rathern
than Legal this causes LegalizeDAG to try to expand STRICT_PF_ROUND to a
conversion using the stack. That conversion creates a truncating store from f64
to f32. But that truncating store isn't Legal on AArch64. So it tries to be
expanded, but there is no handling for expanding a truncating FP store. So it
asserts.
define float @f21() {
entry:
%result = call float @llvm.experimental.constrained.fptrunc.f32.f64(
double 42.1,
metadata !"round.dynamic",
metadata !"fpexcept.strict")
ret float %result
}</pre>
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