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Build the Hopfield network incrementally when splitting global live ranges.

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It is common for large live ranges to have few basic blocks with register uses
and many live-through blocks without any uses. This approach grows the Hopfield
network incrementally around the use blocks, completely avoiding checking
interference for some through blocks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129188 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-04-09 02:59:09 +00:00
parent 9d29cbad32
commit f4afdfc501
7 changed files with 183 additions and 84 deletions
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lib/CodeGen/SplitKit.h
+9 -4
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@@ -89,7 +89,10 @@ private:
SmallVector<BlockInfo, 8> UseBlocks;
/// ThroughBlocks - Block numbers where CurLI is live through without uses.
SmallVector<unsigned, 8> ThroughBlocks;
BitVector ThroughBlocks;
/// NumThroughBlocks - Number of live-through blocks.
unsigned NumThroughBlocks;
SlotIndex computeLastSplitPoint(unsigned Num);
@@ -135,9 +138,11 @@ public:
/// where CurLI has uses.
ArrayRef<BlockInfo> getUseBlocks() { return UseBlocks; }
/// getThroughBlocks - Return an array of block numbers where CurLI is live
/// through without uses.
ArrayRef<unsigned> getThroughBlocks() { return ThroughBlocks; }
/// getNumThroughBlocks - Return the number of through blocks.
unsigned getNumThroughBlocks() const { return NumThroughBlocks; }
/// isThroughBlock - Return true if CurLI is live through MBB without uses.
bool isThroughBlock(unsigned MBB) const { return ThroughBlocks.test(MBB); }
typedef SmallPtrSet<const MachineBasicBlock*, 16> BlockPtrSet;