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Fix up comments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53586 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2008-07-15 03:40:27 +00:00
parent b27cb55923
commit 86dae65baa
1 changed files with 7 additions and 5 deletions
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12
lib/Analysis/ScalarEvolution.cpp
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@@ -2675,7 +2675,7 @@ bool ScalarEvolutionsImpl::executesAtLeastOnce(const Loop *L, bool isSigned,
return false; return false;
} }
if (!PreCondLHS->getType()->isInteger()) return false; if (PreCondLHS->getType()->isInteger()) return false;
return LHS == getSCEV(PreCondLHS) && RHS == getSCEV(PreCondRHS); return LHS == getSCEV(PreCondLHS) && RHS == getSCEV(PreCondRHS);
} }
@@ -2706,12 +2706,14 @@ HowManyLessThans(SCEV *LHS, SCEV *RHS, const Loop *L, bool isSigned) {
// First, we get the value of the LHS in the first iteration: n // First, we get the value of the LHS in the first iteration: n
SCEVHandle Start = AddRec->getOperand(0); SCEVHandle Start = AddRec->getOperand(0);
// Then, we get the value of the LHS in the first iteration in which the
// above condition doesn't hold. This equals to max(m,n).
if (executesAtLeastOnce(L, isSigned, if (executesAtLeastOnce(L, isSigned,
SE.getMinusSCEV(AddRec->getOperand(0), One), RHS)) SE.getMinusSCEV(AddRec->getOperand(0), One), RHS)) {
// Since we know that the condition is true in order to enter the loop,
// we know that it will run exactly m-n times.
return SE.getMinusSCEV(RHS, Start); return SE.getMinusSCEV(RHS, Start);
else { } else {
// Then, we get the value of the LHS in the first iteration in which the
// above condition doesn't hold. This equals to max(m,n).
SCEVHandle End = isSigned ? SE.getSMaxExpr(RHS, Start) SCEVHandle End = isSigned ? SE.getSMaxExpr(RHS, Start)
: SE.getUMaxExpr(RHS, Start); : SE.getUMaxExpr(RHS, Start);