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Add a method to ScalarEvolution for telling it when a loop has been

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modified in a way that may effect the trip count calculation. Change
IndVars to use this method when it rewrites pointer or floating-point
induction variables instead of using a doInitialization method to
sneak these changes in before ScalarEvolution has a chance to see
the loop. This eliminates the need for LoopPass to depend on
ScalarEvolution.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64810 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-02-17 20:49:49 +00:00
parent a84f47c3e7
commit 60f8a63e25
4 changed files with 37 additions and 12 deletions
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include/llvm/Analysis/ScalarEvolution.h
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@@ -301,6 +301,11 @@ namespace llvm {
/// an analyzable loop-invariant iteration count.
bool hasLoopInvariantIterationCount(const Loop *L) const;
/// forgetLoopIterationCount - This method should be called by the
/// client when it has changed a loop in a way that may effect
/// ScalarEvolution's ability to compute a trip count.
void forgetLoopIterationCount(const Loop *L);
/// deleteValueFromRecords - This method should be called by the
/// client before it removes a Value from the program, to make sure
/// that no dangling references are left around.