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Even if there are not any induction variables in the loop, if we can compute

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the trip count for the loop, insert one so that we can canonicalize the exit
condition.

llvm-svn: 13015
This commit is contained in:
Chris Lattner 2004-04-17 18:08:33 +00:00
parent 6d5decd7d4
commit 5c85946417
1 changed files with 11 additions and 1 deletions
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12
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -368,7 +368,17 @@ void IndVarSimplify::runOnLoop(Loop *L) {
// If there are no induction variables in the loop, there is nothing more to
// do.
if (IndVars.empty()) return;
if (IndVars.empty()) {
// Actually, if we know how many times the loop iterates, lets insert a
// canonical induction variable to help subsequent passes.
if (!isa<SCEVCouldNotCompute>(IterationCount)) {
ScalarEvolutionRewriter Rewriter(*SE, *LI);
Rewriter.GetOrInsertCanonicalInductionVariable(L,
IterationCount->getType());
LinearFunctionTestReplace(L, IterationCount, Rewriter);
}
return;
}
// Compute the type of the largest recurrence expression.
//