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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [NewPM] InstCombine always run with ExpensiveCombines enabled"
href="https://bugs.llvm.org/show_bug.cgi?id=44573">44573</a>
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<th>Summary</th>
<td>[NewPM] InstCombine always run with ExpensiveCombines enabled
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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
</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>nikita.ppv@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>NewPM always adds InstCombine in default configuration, which means that
ExpensiveCombines is enabled:
<a href="https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Passes/PassBuilder.cpp#L436">https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Passes/PassBuilder.cpp#L436</a>
Legacy PM only enabled ExpensiveCombines at O3:
<a href="https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp#L247-L251">https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp#L247-L251</a>
I'm assuming that this discrepancy is not intentional. Originally mentioned on
<a href="https://reviews.llvm.org/D72861">https://reviews.llvm.org/D72861</a>.</pre>
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