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Enable critical edge splitting by default

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-18 17:35:14 +00:00
parent 0c09a411e0
commit 36b708f057
1 changed files with 10 additions and 16 deletions
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26
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -36,11 +36,6 @@
#include <iostream>
using namespace llvm;
static cl::opt<bool>
SplitPHICritEdges("split-phi-constant-crit-edges", cl::Hidden,
cl::desc("Split critical edges for PHI values that are constants"));
#ifndef _NDEBUG
static cl::opt<bool>
ViewDAGs("view-isel-dags", cl::Hidden,
@ -966,8 +961,8 @@ unsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) {
}
void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const {
if (!SplitPHICritEdges)
AU.setPreservesAll();
// FIXME: we only modify the CFG to split critical edges. This
// updates dom and loop info.
}
@ -979,15 +974,14 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
// First pass, split all critical edges for PHI nodes with incoming values
// that are constants, this way the load of the constant into a vreg will not
// be placed into MBBs that are used some other way.
if (SplitPHICritEdges)
for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
PHINode *PN;
for (BasicBlock::iterator BBI = BB->begin();
(PN = dyn_cast<PHINode>(BBI)); ++BBI)
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (isa<Constant>(PN->getIncomingValue(i)))
SplitCriticalEdge(PN->getIncomingBlock(i), BB);
}
for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
PHINode *PN;
for (BasicBlock::iterator BBI = BB->begin();
(PN = dyn_cast<PHINode>(BBI)); ++BBI)
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (isa<Constant>(PN->getIncomingValue(i)))
SplitCriticalEdge(PN->getIncomingBlock(i), BB);
}
FunctionLoweringInfo FuncInfo(TLI, Fn, MF);