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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - loop unroll pass missed on simple code"
href="https://bugs.llvm.org/show_bug.cgi?id=47562">47562</a>
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<th>Summary</th>
<td>loop unroll pass missed on simple code
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>bique.alexandre@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23975" name="attach_23975" title="missed-unroll.cc">attachment 23975</a> <a href="attachment.cgi?id=23975&action=edit" title="missed-unroll.cc">[details]</a></span>
missed-unroll.cc
Hi,
Here is a trivial example and loop unroll failed.
20-09-17 17:59:02 abique@knot:~/t/clang> clang -O3 -c missed-unroll.cc
missed-unroll.cc:8:6: warning: loop not unrolled: the optimizer was unable to
perform the requested transformation; the transformation might be disabled or
specified as part of an unsupported transformation ordering
[-Wpass-failed=transform-warning]
void fct_FAIL(float * __restrict__ a, float * __restrict__ b, float *
__restrict__ c, unsigned len)
^
1 warning generated.
20-09-17 17:59:05 abique@knot:~/t/clang>
Regards,
Alexandre</pre>
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</p>
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