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Revert r139126 due to selfhost failures reported by buildbots.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139130 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-09-06 02:43:13 +00:00
parent 77b7352db0
commit b2840fdcd8
2 changed files with 2 additions and 37 deletions
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8
lib/Analysis/ScalarEvolution.cpp
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@@ -5184,12 +5184,8 @@ ScalarEvolution::HowFarToZero(const SCEV *V, const Loop *L) {
// Handle unitary steps, which cannot wraparound.
// 1*N = -Start; -1*N = Start (mod 2^BW), so:
// N = Distance (as unsigned)
if (StepC->getValue()->equalsInt(1) || StepC->getValue()->isAllOnesValue()) {
ConstantRange CR = getUnsignedRange(Start);
const SCEV *MaxBECount = getConstant(CountDown ? CR.getUnsignedMax()
: ~CR.getUnsignedMin());
return ExitLimit(Distance, MaxBECount);
}
if (StepC->getValue()->equalsInt(1) || StepC->getValue()->isAllOnesValue())
return Distance;
// If the recurrence is known not to wraparound, unsigned divide computes the
// back edge count. We know that the value will either become zero (and thus