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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - FPE environment flags are not supported on ARM backend"
href="https://bugs.llvm.org/show_bug.cgi?id=51044">51044</a>
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<th>Summary</th>
<td>FPE environment flags are not supported on ARM backend
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kbalke@waymo.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>I have come across the same issue documented in
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect optimization while converting from FP to Integer"
href="show_bug.cgi?id=45155">https://bugs.llvm.org/show_bug.cgi?id=45155</a> when targeting an ARM Cortex-M
architecture. The suggested fix does not work, however, as it appears that the
-ffp-* flags are not supported for the ARM code generator.
Minimum reproducing example for our use-case: <a href="https://godbolt.org/z/7e11MKq7o">https://godbolt.org/z/7e11MKq7o</a>
In the clang case, the conversion is reordered across the branch, thus causing
the FPE (which results in a jump to a handler if the FPE trap handler is
configured on the target, which ours is).
Would it be possible to have the strict floating-point-environment behavior
controls re-enabled for the ARM backend?</pre>
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