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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - neon instructions emitted for targets without it."
href="https://llvm.org/bugs/show_bug.cgi?id=30732">30732</a>
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<th>Summary</th>
<td>neon instructions emitted for targets without it.
</td>
</tr>
<tr>
<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>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yyc1992@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>From `lib/Target/ARM/ARM.td` it seems that all ARMv7a targets have
`FeatureNEON`. However, this should be an optional feature on armv7-a and for
example the scaleway server uses cortex-a7 without neon instructions.
I initially noticed this in the julia codegen. It can also be reproduced using
clang by compiling `double f(void) { return 0.0; }` with `clang
--target=arm-linux-unknown-gnueabihf -march=armv7-a -mcpu=generic -O2 f.c -S -o
-`. The asm generated has `.fpu neon` and is using neon instruction
`vmov.i32 d0, #0x0` to construct the return value.</pre>
</div>
</p>
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