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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 --- - Mere addition of template makes -Rpass-analysis=loop-vectorize fall silent"
href="https://llvm.org/bugs/show_bug.cgi?id=28377">28377</a>
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<th>Summary</th>
<td>Mere addition of template makes -Rpass-analysis=loop-vectorize fall silent
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sean@rogue-research.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>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16665" name="attach_16665" title="repro case">attachment 16665</a> <a href="attachment.cgi?id=16665&action=edit" title="repro case">[details]</a></span>
repro case
Maybe a dupe of #28374, but...
If I have 2 identical functions, but template one, clang's
-Rpass-analysis=loop-vectorize flag will talk about the one, but fall silent
about the templated one:
-------test.cxx---------
template <typename T>
void test1(int *A, int *B, int Length)
{
for (int i = 0; i < Length; i++)
{
switch(A[i])
{
case 0: B[i] = 1;
break;
case 1: B[i] = 2;
break;
default: B[i] = 3;
}
}
}
void test2(int *A, int *B, int Length)
{
for (int i = 0; i < Length; i++)
{
switch(A[i])
{
case 0: B[i] = 1;
break;
case 1: B[i] = 2;
break;
default: B[i] = 3;
}
}
}
------------------------
$ clang --version
clang version 3.9.0 (trunk 274259)
$ clang -S -fvectorize -O3 -Rpass=loop-vectorize -Rpass-missed=loop-vectorize
-Rpass-analysis=loop-vectorize ~/Desktop/test.cxx
/Users/sean/Desktop/test.cxx:21:9: remark: loop not vectorized: loop contains a
switch statement [-Rpass-analysis=loop-vectorize]
switch(A[i])
^
/Users/sean/Desktop/test.cxx:19:5: remark: loop not vectorized: use
-Rpass-analysis=loop-vectorize for more info [-Rpass-missed=loop-vectorize]
for (int i = 0; i < Length; i++)
^
It says it can't vectorize the 2nd loop (lines 19-21 ish), but says nothing at
all about the first (templated) function.</pre>
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