[PATCH] D91093: [X86 and PPC] Tune SelectionDAG CTPOP emulation via TLI hook

[David Zarzycki via Phabricator via llvm-commits]

davezarzycki created this revision.
davezarzycki added reviewers: craig.topper, spatel, RKSimon.
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When CTPOP is not legal, emulating it can be quite expensive. In D89952 <https://reviews.llvm.org/D89952>, a TLI hook was added to allow targets to tune how expensive CTPOP emulation is. This patch attempts to do basic/easy tuning. More refinement is certainly possible, especially when a legal CTPOP is available but with the "wrong" type/size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D91093

Files:
  llvm/test/CodeGen/PowerPC/vector-popcnt-128-ult-ugt.ll

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