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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ScalarEvolution can introduce branch on poison"
href="https://bugs.llvm.org/show_bug.cgi?id=47769">47769</a>
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<th>Summary</th>
<td>ScalarEvolution can introduce branch on poison
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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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>kevindevos9542@gmail.com
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<th>CC</th>
<td>chenzheng1030@hotmail.com, florian_hahn@apple.com, huihuiz@codeaurora.org, lebedev.ri@gmail.com, llvm-bugs@lists.llvm.org, max.kazantsev@azul.com, nunoplopes@sapo.pt, sam.parker@arm.com
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<pre>Test: Transforms/LoopVectorize/pr30654-phiscev-sext-trunc.ll
Function: doit1
Reason: Source more defined than target
Example: <a href="https://godbolt.org/z/1nMsMT">https://godbolt.org/z/1nMsMT</a>
LoopVectorize adds the block vector.scevcheck and uses SCEVExpander to generate
checks that use %step. If %step is poison it introduces branch on poison.</pre>
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