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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Invariant store should sink to loop exit"
href="https://llvm.org/bugs/show_bug.cgi?id=26082">26082</a>
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<th>Summary</th>
<td>Invariant store should sink to loop exit
</td>
</tr>
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<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>3.7
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>opt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>marksl@synopsys.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>The store in the inner loop should be moved to the loop exit block. The test
case is arbitrary. The idiom is common to many DSP kernels.
void test(const int * restrict p_a, const int * restrict p_b, int * restrict
p_z) {
#pragma clang loop unroll(disable)
for (int i = 0; i < 10; i++) {
*p_z = 0;
#pragma clang loop unroll(disable)
for (int f=0;f<10;f++)
*p_z += *p_a++ * *p_b++ ; //HERE
p_z++;
}
}</pre>
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</p>
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