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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SCEV: loop trip count computation for loops *-or-equal comparisons"
href="https://bugs.llvm.org/show_bug.cgi?id=51761">51761</a>
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<th>Summary</th>
<td>SCEV: loop trip count computation for loops *-or-equal comparisons
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>lebedev.ri@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<div>
<pre>The motivation is:
<a href="https://godbolt.org/z/dYeWcvz6T">https://godbolt.org/z/dYeWcvz6T</a>
We fail to compute the trip count, and fail to vectorize.
Let's ignore the lowering of the OpenMP for a second (it may be suboptimal.)
Indeed, support for ULE/UGE is missing in
ScalarEvolution::computeExitLimitFromICmp()
I think the formula is:
<a href="https://godbolt.org/z/q61j4cf5K">https://godbolt.org/z/q61j4cf5K</a> <a href="https://alive2.llvm.org/ce/z/htSXXe">https://alive2.llvm.org/ce/z/htSXXe</a>
Now, ignorant question: i'm guessing this is much more complicated
than just asking `ScalarEvolution::howManyLessThans()`
and incrementing the result?</pre>
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