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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Clang assumes that Cortex-M4 has an FPU by default" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24100&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=GnZF9nD9f2L9S-osFv-K1_4Elz0uiuZX3MS-h31gWkI&s=Q_AclJPqliRXBvfDzHTmPIn4A1apeWkd0OHGJeWCqlk&e=">24100</a>
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<th>Summary</th>
<td>Clang assumes that Cortex-M4 has an FPU by default
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ambrop7@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14579" name="attach_14579" title="Test case, function that multiplies floats">attachment 14579</a> <a href="attachment.cgi?id=14579&action=edit" title="Test case, function that multiplies floats">[details]</a></span>
Test case, function that multiplies floats
When one compiles for arm-none-eabi with "-mcpu=cortex-m4", the generated code
will use floating point instructions. This is different from GCC (the
gcc-arm-embedded builds), which will use software floating point unless an FPU
is specified (e.g. -mfpu=fpv4-sp-d16 -mfloat-abi=hard). Note that are many
Cortex-M4 parts without an FPU.
Attached is a test case that can be compiled to assembly with:
arm-none-eabi-clang -mcpu=cortex-m4 -mthumb -S float.c -o -</pre>
</div>
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