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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLVM ERROR: Cannot select (@llvm.maxnum.v2f32)"
href="https://llvm.org/bugs/show_bug.cgi?id=26244">26244</a>
</td>
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<tr>
<th>Summary</th>
<td>LLVM ERROR: Cannot select (@llvm.maxnum.v2f32)
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rahulchaudhry@chromium.org
</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>Created <span class=""><a href="attachment.cgi?id=15684" name="attach_15684" title="Reproducer">attachment 15684</a> <a href="attachment.cgi?id=15684&action=edit" title="Reproducer">[details]</a></span>
Reproducer
See the attached reduced.ll file.
$ llc reduced.ll
LLVM ERROR: Cannot select: t4: v2f32 = fmaxnum t20, undef:v2f32
t20: v2f32 = bitcast t19
t19: v2i32 = ARMISD::VMOVIMM TargetConstant:i32<0>
t18: i32 = TargetConstant<0>
t1: v2f32 = undef
In function: foo
Using llvm/clang from tip-of-trunk (as of 01/20/2016).
This issue was found while trying to build Chrome browser for Chrome OS. The
(reduced) set of flags used to compile the original c++ file were:
clang++ \
-cc1 \
-triple thumbv7-cros-linux-gnueabi \
-target-cpu cortex-a8 \
-target-feature +fp-armv8 \
-vectorize-slp \
-std=gnu++11 \
-emit-obj \
-O2 \
test.cpp
Removing the "-vectorize-slp" flag lets the compile go through.</pre>
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