https://bugs.llvm.org/show_bug.cgi?id=44573
Bug ID: 44573
Summary: [NewPM] InstCombine always run with ExpensiveCombines
enabled
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: nikita....@gmail.com
CC: llvm-bugs@lists.llvm.org
NewPM always adds InstCombine in default configuration, which means that
ExpensiveCombines is enabled:
https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Passes/PassBuilder.cpp#L436
Legacy PM only enabled ExpensiveCombines at O3:
https://github.com/llvm/llvm-project/blob/53b68e676faf208b4a8f817e9bd4ddd522cc6006/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp#L247-L251
I'm assuming that this discrepancy is not intentional. Originally mentioned on
https://reviews.llvm.org/D72861.
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