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Add a comment with a rational for the unusual code structure 

llvm-svn: 262454
This commit is contained in:
Sanjoy Das 2016-03-02 02:56:29 +00:00
parent eca1b53b95
commit 6b017a11ba
1 changed files with 3 additions and 0 deletions
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3
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -4577,6 +4577,9 @@ ConstantRange ScalarEvolution::getRangeViaFactoring(const SCEV *Start,
// from deep in the call stack, and calling getSCEV (on a sext instruction,
// say) can end up caching a suboptimal value.
// FIXME: without the explicit `this` receiver below, MSVC errors out with
// C2352 and C2512 (otherwise it isn't needed).
const SCEV *TrueStart = this->getConstant(*StartPattern.TrueValue + Offset);
const SCEV *TrueStep = this->getConstant(*StepPattern.TrueValue);
const SCEV *FalseStart = this->getConstant(*StartPattern.FalseValue + Offset);