[PATCH] D89952: [SelectionDAG] Fine tune CTPOP optimizations

[David Zarzycki via Phabricator via llvm-commits]

davezarzycki updated this revision to Diff 300054.
davezarzycki added a comment.

Updated CTPOP emulation cost heuristics and test diffs so people can see the fallout. Overall, I tried to aim for the same or fewer number of instructions as before, which should be a win because chains of "x & (x - 1)" don't require memory loads, unlike actual CTPOP emulation.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D89952/new/

https://reviews.llvm.org/D89952

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/test/CodeGen/X86/vector-popcnt-128-ult-ugt.ll
  llvm/test/CodeGen/X86/vector-popcnt-256-ult-ugt.ll
  llvm/test/CodeGen/X86/vector-popcnt-512-ult-ugt.ll