[PATCH] D67148: [LoopVectorize][PowerPC] Estimate int and float register pressure separately in loop-vectorize

[Zixuan Wu (Zeson) via Phabricator via llvm-commits]

wuzish updated this revision to Diff 219872.
wuzish added a comment.

Address comments.  Add 3 function interfaces.

  /// \return the number of registers in the target-provided register class.
  unsigned getNumberOfRegisters(unsigned ClassID) const;
  
  /// return the target-provided register class for the provided type.
  unsigned getRegisterClassForType(Type *Ty, bool Vector) const;
  
  /// return the target-provided register class name
  const char* getRegisterClassName(unsigned ClassID) const;

Use register class enum to distinguish different llvm types that residing in different register positions. Every target can has its own register class mapping from llvm type to register class ID. For general backend implementation, there are 3 default register class, `GenericIntScalarRC = 1, GenericFloatScalarRC = 2, GenericVectorRC = 3`.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D67148/new/

https://reviews.llvm.org/D67148

Files:
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/lib/Analysis/TargetTransformInfo.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h
  llvm/lib/Target/ARM/ARMTargetTransformInfo.h
  llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
  llvm/lib/Target/PowerPC/PPCTargetTransformInfo.h
  llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
  llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
  llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.h
  llvm/lib/Target/X86/X86TargetTransformInfo.cpp
  llvm/lib/Target/X86/X86TargetTransformInfo.h
  llvm/lib/Target/XCore/XCoreTargetTransformInfo.h
  llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/LoopVectorize/PowerPC/reg-usage.ll
  llvm/test/Transforms/LoopVectorize/X86/reg-usage-debug.ll
  llvm/test/Transforms/LoopVectorize/X86/reg-usage.ll

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