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Build the correct range for loops with unusual bounds. Fix from Jay Foad.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42394 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2007-09-27 14:12:54 +00:00
parent 0678f60bf2
commit 9a2f93121b
2 changed files with 22 additions and 1 deletions
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2
lib/Analysis/ScalarEvolution.cpp
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@@ -2470,7 +2470,7 @@ SCEVHandle SCEVAddRecExpr::getNumIterationsInRange(ConstantRange Range) const {
APInt End = A.sge(One) ? (Range.getUpper() - One) : Range.getLower();
// The exit value should be (End+A)/A.
APInt ExitVal = (End + A).sdiv(A);
APInt ExitVal = (End + A).udiv(A);
ConstantInt *ExitValue = ConstantInt::get(ExitVal);
// Evaluate at the exit value. If we really did fall out of the valid