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LiveVariables::VarInfo contains an AliveBlocks BitVector, which has as many

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entries as there are basic blocks in the function.  LiveVariables::getVarInfo
creates a VarInfo struct for every register in the function, leading to
quadratic space use.  This patch changes the BitVector to a SparseBitVector,
which doesn't help the worst-case memory use but does reduce the actual use in
very long functions with short-lived variables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72426 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jeffrey Yasskin
2009-05-26 18:27:15 +00:00
parent 91bb61a1e2
commit 493a3d015c
4 changed files with 17 additions and 19 deletions
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10
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -422,7 +422,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// If the kill happens after the definition, we have an intra-block
// live range.
if (killIdx > defIndex) {
assert(vi.AliveBlocks.none() &&
assert(vi.AliveBlocks.empty() &&
"Shouldn't be alive across any blocks!");
LiveRange LR(defIndex, killIdx, ValNo);
interval.addRange(LR);
@ -443,10 +443,10 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Iterate over all of the blocks that the variable is completely
// live in, adding [insrtIndex(begin), instrIndex(end)+4) to the
// live interval.
for (int i = vi.AliveBlocks.find_first(); i != -1;
i = vi.AliveBlocks.find_next(i)) {
LiveRange LR(getMBBStartIdx(i),
getMBBEndIdx(i)+1, // MBB ends at -1.
for (SparseBitVector<>::iterator I = vi.AliveBlocks.begin(),
E = vi.AliveBlocks.end(); I != E; ++I) {
LiveRange LR(getMBBStartIdx(*I),
getMBBEndIdx(*I)+1, // MBB ends at -1.
ValNo);
interval.addRange(LR);
DOUT << " +" << LR;