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Precompute block frequencies, pow() isn't free.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126975 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-04 00:58:40 +00:00
parent 13ba2dab63
commit 40a42a2cca
3 changed files with 15 additions and 17 deletions
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16
lib/CodeGen/SpillPlacement.cpp
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@ -175,9 +175,12 @@ bool SpillPlacement::runOnMachineFunction(MachineFunction &mf) {
nodes = new Node[bundles->getNumBundles()];
// Compute total ingoing and outgoing block frequencies for all bundles.
BlockFrequency.resize(mf.getNumBlockIDs());
for (MachineFunction::iterator I = mf.begin(), E = mf.end(); I != E; ++I) {
float Freq = getBlockFrequency(I);
float Freq = LiveIntervals::getSpillWeight(true, false,
loops->getLoopDepth(I));
unsigned Num = I->getNumber();
BlockFrequency[Num] = Freq;
nodes[bundles->getBundle(Num, 1)].Frequency[0] += Freq;
nodes[bundles->getBundle(Num, 0)].Frequency[1] += Freq;
}
@ -206,8 +209,7 @@ void SpillPlacement::
prepareNodes(const SmallVectorImpl<BlockConstraint> &LiveBlocks) {
for (SmallVectorImpl<BlockConstraint>::const_iterator I = LiveBlocks.begin(),
E = LiveBlocks.end(); I != E; ++I) {
MachineBasicBlock *MBB = MF->getBlockNumbered(I->Number);
float Freq = getBlockFrequency(MBB);
float Freq = getBlockFrequency(I->Number);
// Is this a transparent block? Link ingoing and outgoing bundles.
if (I->Entry == DontCare && I->Exit == DontCare) {
@ -320,11 +322,3 @@ SpillPlacement::placeSpills(const SmallVectorImpl<BlockConstraint> &LiveBlocks,
}
return Perfect;
}
/// getBlockFrequency - Return our best estimate of the block frequency which is
/// the expected number of block executions per function invocation.
float SpillPlacement::getBlockFrequency(const MachineBasicBlock *MBB) {
// Use the unnormalized spill weight for real block frequencies.
return LiveIntervals::getSpillWeight(true, false, loops->getLoopDepth(MBB));
}