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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Register Tiling of two not handled correctly"
href="https://bugs.llvm.org/show_bug.cgi?id=32625">32625</a>
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<th>Summary</th>
<td>Register Tiling of two not handled correctly
</td>
</tr>
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<th>Product</th>
<td>Polly
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Optimizer
</td>
</tr>
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
</td>
</tr>
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<th>Reporter</th>
<td>khaldi.dounia@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>In the following code:
void MVM(float *__restrict A, float *__restrict B, float *__restrict C, int M,
int K){
for(int i=0;i<M;i+=1){
for (int k = 0; k<K; k++){
C[i]+=A[i+k*M]*B[k];
}
}
}
When I choose to register tile Loop k by 2. I get this
for (int c1 = 0; c1 < floord(K + 1, 2); c1 += 1) {
And then __builtin_assume(K % 2 == 0); does not replace the above by for (int
c1 = 0; c1 < K/ 2); c1 += 1) and thus does not remove the conditionals in the
register tiling output.
Apparently this is related to the fact that division by two is translated to a
shift, which is not handled correctly yet. This needs a fix.</pre>
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