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Cache basic block boundaries for faster RegMaskSlots access.

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Provide API to get a list of register mask slots and bits in a basic
block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150219 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-02-10 01:26:29 +00:00
parent ebf2750a70
commit 34e85d0307
2 changed files with 36 additions and 1 deletions
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9
lib/CodeGen/LiveIntervalAnalysis.cpp
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@@ -90,6 +90,7 @@ void LiveIntervals::releaseMemory() {
r2iMap_.clear();
RegMaskSlots.clear();
RegMaskBits.clear();
RegMaskBlocks.clear();
// Release VNInfo memory regions, VNInfo objects don't need to be dtor'd.
VNInfoAllocator.Reset();
@@ -533,10 +534,14 @@ void LiveIntervals::computeIntervals() {
<< "********** Function: "
<< ((Value*)mf_->getFunction())->getName() << '\n');
RegMaskBlocks.resize(mf_->getNumBlockIDs());
SmallVector<unsigned, 8> UndefUses;
for (MachineFunction::iterator MBBI = mf_->begin(), E = mf_->end();
MBBI != E; ++MBBI) {
MachineBasicBlock *MBB = MBBI;
RegMaskBlocks[MBB->getNumber()].first = RegMaskSlots.size();
if (MBB->empty())
continue;
@@ -587,6 +592,10 @@ void LiveIntervals::computeIntervals() {
// Move to the next instr slot.
MIIndex = indexes_->getNextNonNullIndex(MIIndex);
}
// Compute the number of register mask instructions in this block.
std::pair<unsigned, unsigned> &RMB = RegMaskBlocks[MBB->getNumber()];
RMB.second = RegMaskSlots.size() - RMB.first;;
}
// Create empty intervals for registers defined by implicit_def's (except