[PATCH] D39232: [CodeGen][ExpandMemcmp] Allow memcmp to expand to vector loads (2).

[Clement Courbet via Phabricator via llvm-commits]

courbet created this revision.
Herald added a subscriber: kbarton.

- Targets that want to support memcmp expansions now return the list of supported load sizes.
- Expansion codegen does not assume that all power-of-two load sizes smaller than the max load size are valid. For examples, this is not the case for x86(32bit)+sse2.

Fixes PR34887.


https://reviews.llvm.org/D39232

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/Analysis/TargetTransformInfoImpl.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/PowerPC/PPCTargetTransformInfo.cpp
  lib/Target/PowerPC/PPCTargetTransformInfo.h
  lib/Target/X86/X86TargetTransformInfo.cpp
  lib/Target/X86/X86TargetTransformInfo.h
  lib/Transforms/Scalar/MergeICmps.cpp
  test/CodeGen/X86/memcmp-optsize.ll
  test/CodeGen/X86/memcmp.ll
  test/Transforms/CodeGenPrepare/X86/memcmp.ll

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