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Remove unnecessary IDom check 

Summary: This Idom check seems unnecessary. The immediate children of a node on the Dominator Tree should always be the IDom of its immediate children in this case.

Reviewers: hfinkel, majnemer, dberlin

Reviewed By: dberlin

Subscribers: dberlin, davide, llvm-commits

Differential Revision: https://reviews.llvm.org/D26954

llvm-svn: 298232
This commit is contained in:
Xin Tong 2017-03-20 00:30:19 +00:00
parent ff9749f759
commit cbf04d95e6
1 changed files with 4 additions and 3 deletions
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7
llvm/lib/Transforms/Scalar/Sink.cpp
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@ -164,13 +164,14 @@ static bool SinkInstruction(Instruction *Inst,
// Instructions can only be sunk if all their uses are in blocks
// dominated by one of the successors.
// Look at all the postdominators and see if we can sink it in one.
// Look at all the dominated blocks and see if we can sink it in one.
DomTreeNode *DTN = DT.getNode(Inst->getParent());
for (DomTreeNode::iterator I = DTN->begin(), E = DTN->end();
I != E && SuccToSinkTo == nullptr; ++I) {
BasicBlock *Candidate = (*I)->getBlock();
if ((*I)->getIDom()->getBlock() == Inst->getParent() &&
IsAcceptableTarget(Inst, Candidate, DT, LI))
// A node always immediate-dominates its children on the dominator
// tree.
if (IsAcceptableTarget(Inst, Candidate, DT, LI))
SuccToSinkTo = Candidate;
}