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Add a comment to getNewAlignmentDiff.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217350 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2014-09-07 23:16:24 +00:00
parent 5f36b46bf0
commit feae667742
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
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@ -96,8 +96,10 @@ FunctionPass *llvm::createAlignmentFromAssumptionsPass() {
// Given an expression for the (constant) alignment, AlignSCEV, and an
// expression for the displacement between a pointer and the aligned address,
// DiffSCEV, compute the alignment of the displaced pointer if it can be
// reduced to a constant.
// DiffSCEV, compute the alignment of the displaced pointer if it can be reduced
// to a constant. Using SCEV to compute alignment handles the case where
// DiffSCEV is a recurrence with constant start such that the aligned offset
// is constant. e.g. {16,+,32} % 32 -> 16.
static unsigned getNewAlignmentDiff(const SCEV *DiffSCEV,
const SCEV *AlignSCEV,
ScalarEvolution *SE) {