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[IndVarSimplify] Widen loop unsigned compares.

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This patch extends r217953 to handle unsigned comparison.
Phabricator revision: http://reviews.llvm.org/D5526

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218659 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2014-09-30 03:17:42 +00:00
parent 4abb04a65c
commit ecea7ba518
2 changed files with 30 additions and 6 deletions
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8
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -936,12 +936,8 @@ bool WidenIV::WidenLoopCompare(NarrowIVDefUse DU) {
if (!Cmp)
return false;
// Must be a signed compare.
if (!CmpInst::isSigned(Cmp->getPredicate()))
return false;
// Must be a signed IV user.
if (!IsSigned)
// Sign of IV user and compare must match.
if (IsSigned != CmpInst::isSigned(Cmp->getPredicate()))
return false;
Value *Op = Cmp->getOperand(Cmp->getOperand(0) == DU.NarrowDef ? 1 : 0);