From bc7129f9dbc6651407134e80a4202adc2ef2511c Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Sun, 11 Apr 2010 22:12:18 +0000 Subject: When creating a ConstantRange for [n,UINT_MAX], special case n == 0, because ConstantRange(0, 0) creates an empty range rather than a full one. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100993 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/ScalarEvolution.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'lib/Analysis') diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index c67cb71..44aa508 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -2920,9 +2920,10 @@ ScalarEvolution::getUnsignedRange(const SCEV *S) { // initial value. if (AddRec->hasNoUnsignedWrap()) if (const SCEVConstant *C = dyn_cast(AddRec->getStart())) - ConservativeResult = - ConstantRange(C->getValue()->getValue(), - APInt(getTypeSizeInBits(C->getType()), 0)); + if (!C->isZero()) + ConservativeResult = + ConstantRange(C->getValue()->getValue(), + APInt(getTypeSizeInBits(C->getType()), 0)); // TODO: non-affine addrec if (AddRec->isAffine()) { -- cgit v1.1