[PATCH] D76956: [TTI][SLP] Add TTI interface to estimate cost of chain of vector inserts/extracts.

[Valeriy Dmitriev via Phabricator via llvm-commits]

vdmitrie created this revision.
vdmitrie added reviewers: craig.topper, RKSimon, ABataev, andreadb, spatel, lebedev.ri.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

Cost for single insert/extract to/from vector is correct. But when summing costs
of single insert/extract instructions it can be overestimated as extraction/insertion
of 128 bits sub-vectors only needed once per group of elements that go to/from
same 128 bits sub-vector.
Using this interface in SLP fixes some cases that previously bailed due to
high gathering cost.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76956

Files:
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/lib/Analysis/TargetTransformInfo.cpp
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/X86/resched.ll

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