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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failure when inline assembly referencing floating point registers is used on soft-float targets"
href="https://bugs.llvm.org/show_bug.cgi?id=52230">52230</a>
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<th>Summary</th>
<td>Assertion failure when inline assembly referencing floating point registers is used on soft-float targets
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>Backend: ARM
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>kosov.pavel@huawei.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
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<p>
<div>
<pre>We have a problem which triggers assertion failure (or UB) when inline assembly
referencing floating point registers is used on soft-float targets
(arm-linux-gnueabi, arm-linux-android). Asserion is triggered in backend which
tries to lower FP register access without FP registers available (target
feature “-fpregs” is passed to backend by clang).
Steps to reproduce:
Given code sample `f.c`
```
float f(float x) { __asm__("vsqrt.f32 %0, %1": "=w"(x) : "t"(x)); return x; }
```
Compile it to arm-linux-gnueabi target with
`clang -target arm-linux-gnueabi -c f.c`</pre>
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