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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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6
lib/CodeGen/PHIElimination.cpp
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@@ -334,8 +334,7 @@ void PNE::LowerAtomicPHINode(MachineBasicBlock &MBB,
// Is it alive in this successor?
unsigned SuccIdx = SuccMBB->getNumber();
if (SuccIdx < InRegVI.AliveBlocks.size() &&
InRegVI.AliveBlocks[SuccIdx]) {
if (InRegVI.AliveBlocks.test(SuccIdx)) {
ValueIsLive = true;
break;
}
@@ -407,8 +406,7 @@ void PNE::LowerAtomicPHINode(MachineBasicBlock &MBB,
// This vreg no longer lives all of the way through opBlock.
unsigned opBlockNum = opBlock.getNumber();
if (opBlockNum < InRegVI.AliveBlocks.size())
InRegVI.AliveBlocks[opBlockNum] = false;
InRegVI.AliveBlocks.reset(opBlockNum);
}
}