[PATCH] D38085: Use the basic cost if a GEP is not used as addressing mode

[Jun Bum Lim via Phabricator via llvm-commits]

junbuml created this revision.
Herald added a subscriber: javed.absar.

Currently, getGEPCost() returns TCC_FREE whenever a GEP is a legal addressing mode in the target.
However, since it doesn't check its actual users, it will return FREE even in cases
where the GEP cannot be folded away as a part of actual addressing mode.
For example, if an user of the GEP is a call instruction taking the GEP as a parameter,
then the GEP may not be folded in isel.


https://reviews.llvm.org/D38085

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  include/llvm/CodeGen/BasicTTIImpl.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/Transforms/Scalar/NaryReassociate.cpp
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  test/Analysis/CostModel/AArch64/gep.ll
  test/Analysis/CostModel/X86/vector_gep.ll

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