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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-09-06 02:43:13 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-09-06 02:43:13 +0000 |
| commit | b2840fdcd8a98de32e86e70a267b54cf0af35140 (patch) | |
| tree | 7eba2990a61df35b99228a924255c6bf7999efc5 /lib/Analysis/ScalarEvolution.cpp | |
| parent | 77b7352db027cb486d25a92c2756c379a3073d7f (diff) | |
| download | external_llvm-b2840fdcd8a98de32e86e70a267b54cf0af35140.zip external_llvm-b2840fdcd8a98de32e86e70a267b54cf0af35140.tar.gz external_llvm-b2840fdcd8a98de32e86e70a267b54cf0af35140.tar.bz2 | |
Revert r139126 due to selfhost failures reported by buildbots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139130 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index a2cd38b..8859c3b 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -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 |