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Enable critical edge splitting by default
llvm-svn: 22863
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@ -36,11 +36,6 @@
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#include <iostream>
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using namespace llvm;
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static cl::opt<bool>
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SplitPHICritEdges("split-phi-constant-crit-edges", cl::Hidden,
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cl::desc("Split critical edges for PHI values that are constants"));
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#ifndef _NDEBUG
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static cl::opt<bool>
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ViewDAGs("view-isel-dags", cl::Hidden,
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@ -966,8 +961,8 @@ unsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) {
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}
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void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
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if (!SplitPHICritEdges)
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AU.setPreservesAll();
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// FIXME: we only modify the CFG to split critical edges. This
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// updates dom and loop info.
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}
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@ -979,15 +974,14 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
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// First pass, split all critical edges for PHI nodes with incoming values
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// that are constants, this way the load of the constant into a vreg will not
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// be placed into MBBs that are used some other way.
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if (SplitPHICritEdges)
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for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
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PHINode *PN;
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for (BasicBlock::iterator BBI = BB->begin();
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(PN = dyn_cast<PHINode>(BBI)); ++BBI)
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
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if (isa<Constant>(PN->getIncomingValue(i)))
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SplitCriticalEdge(PN->getIncomingBlock(i), BB);
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}
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for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
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PHINode *PN;
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for (BasicBlock::iterator BBI = BB->begin();
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(PN = dyn_cast<PHINode>(BBI)); ++BBI)
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
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if (isa<Constant>(PN->getIncomingValue(i)))
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SplitCriticalEdge(PN->getIncomingBlock(i), BB);
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}
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FunctionLoweringInfo FuncInfo(TLI, Fn, MF);
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