[PATCH] D12947: [SCEV] Introduce ScalarEvolution::getOne and getZero.

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: reames, hfinkel, majnemer.
sanjoy added a subscriber: llvm-commits.
Herald added a subscriber: sanjoy.

It is fairly common to call SE->getConstant(Ty, 0) or
SE->getConstant(Ty, 1); this change makes such uses a little bit
briefer.

I've refactored the call sites I could find easily to use getZero /
getOne.

If this were smaller I'd check it in for post commit review, but given
that it's is fairly large, it'd be nice to have some extra eyes look
this over.

I can bootstrap clang with this change.

http://reviews.llvm.org/D12947

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/DependenceAnalysis.cpp
  lib/Analysis/ScalarEvolution.cpp
  lib/Target/PowerPC/PPCCTRLoops.cpp
  lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  lib/Transforms/Scalar/LoopRerollPass.cpp
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
  lib/Transforms/Utils/SimplifyIndVar.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp

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