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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - NewGVN should account for switch statements with multiple edges to themselves"
href="https://bugs.llvm.org/show_bug.cgi?id=33184">33184</a>
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<th>Summary</th>
<td>NewGVN should account for switch statements with multiple edges to themselves
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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
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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>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>davide@freebsd.org
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<th>CC</th>
<td>dberlin@dberlin.org, llvm-bugs@lists.llvm.org
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<p>
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<pre>If switch statements with multiple edges to itself are allowed, then the
current ordering might not work.
Quoting from <a href="https://reviews.llvm.org/D24805">https://reviews.llvm.org/D24805</a>
"""
Do we allow switch statements with multiple edges to ourself?
ie
bb1:
switch <whatever> [
i32 0 : label bb1
i32 1: label bb1 ]
(which, after propagation, could cause a phi with different operands and the
same incoming blocks)
If so, either we need stable sorts, or a better ordering of incoming blocks,
because the pointer equality we use will not definitely sort them into a
consistent order
"""</pre>
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