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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 --- - ARM backend emitting vfp/neon instructions while features disabled"
href="https://llvm.org/bugs/show_bug.cgi?id=25818">25818</a>
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<th>Summary</th>
<td>ARM backend emitting vfp/neon instructions while features disabled
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>3.6
</td>
</tr>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: ARM
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm@shortepic.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>Compiling with rustc-nightly (81ae8be71 2015-12-09), and the following target
definition containing (selected):
"arch": "arm",
"cpu": "cortex-a8",
"fpu": "none",
"data-layout":
"e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64",
"disable-redzone": true,
"executables": true,
"llvm-target": "arm-none-eabi",
"os": "none",
"target-endian": "little",
"target-word-size": "32",
"target-pointer-width": "32",
"no-compiler-rt" : true,
"has-floating-point" : false,
"features" : "-fp16,-d16,-vfp2,-vfp3,-vfp4,-neon,-fp-only-sp",
rustc is emitting v* instructions:
106c0: edd00b00 vldr d16, [r0]
106c4: ed4b0b08 vstr d16, [fp, #-32] ; 0xffffffe0
106c8: edd00b02 vldr d16, [r0, #8]
106cc: ed4b0b0a vstr d16, [fp, #-40] ; 0xffffffd8
106d0: e5900010 ldr r0, [r0, #16]
106d4: e50b002c str r0, [fp, #-44] ; 0x2c
106d8: ed5b0b08 vldr d16, [fp, #-32] ; 0xffffffe0
106dc: edcd0b0a vstr d16, [sp, #40] ; 0x28
I'd like to suppress those when generating kernel code and I understand
negating features to be the basis for doing that. Can a maintainer please give
me a sense whether this is intended behaviour?
(So sorry I don't have the skills to isolate this closer to llvm..)
Regards, Alister.</pre>
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