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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Options '-optimize-regalloc=false -regalloc=greedy' allowed and failing"
href="https://bugs.llvm.org/show_bug.cgi?id=33022">33022</a>
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<th>Summary</th>
<td>Options '-optimize-regalloc=false -regalloc=greedy' allowed and failing
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<th>Product</th>
<td>libraries
</td>
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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
</td>
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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>Register Allocator
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>I discovered that the use of these two options made a lot of vregs survive the
greedy register allocator. Eventually this was displayed:
MachineFunctionProperties required by Prologue/Epilogue Insertion & Frame
Finalization pass are not met by function autogen_SD13131.
Required properties: NoVRegs
Current properties: NoPHIs, TracksLiveness
MachineFunctionProperties check failed
My guess is that this is something that would never work. It seems to me that
perhaps this combination of options should not be allowed, in case a novice
user happens to try it?</pre>
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