[PATCH] D79111: [CostModel][X86][ARM] Teach default implementation of getCastInstrCost to not add a split/join cost if source type and the destination type both have a SplitVector action

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.
Herald added subscribers: danielkiss, kristof.beyls.
Herald added a project: LLVM.

If both the source and the destination need to be split then the two halves of the split operation are completely independent and don't need to be split or joined. So we don't need to assess a cost for the split or join.


https://reviews.llvm.org/D79111

Files:
  llvm/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/test/Analysis/CostModel/ARM/cast.ll
  llvm/test/Analysis/CostModel/X86/arith-fix.ll
  llvm/test/Analysis/CostModel/X86/arith-overflow.ll
  llvm/test/Analysis/CostModel/X86/cast.ll
  llvm/test/Analysis/CostModel/X86/extend.ll
  llvm/test/Analysis/CostModel/X86/fptosi.ll
  llvm/test/Analysis/CostModel/X86/fptoui.ll
  llvm/test/Analysis/CostModel/X86/masked-intrinsic-cost.ll
  llvm/test/Analysis/CostModel/X86/min-legal-vector-width.ll
  llvm/test/Analysis/CostModel/X86/sitofp.ll
  llvm/test/Analysis/CostModel/X86/trunc.ll
  llvm/test/Analysis/CostModel/X86/uitofp.ll

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