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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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7
include/llvm/CodeGen/EdgeBundles.h
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@@ -16,6 +16,7 @@
#ifndef LLVM_CODEGEN_EDGEBUNDLES_H
#define LLVM_CODEGEN_EDGEBUNDLES_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/IntEqClasses.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
@@ -29,6 +30,9 @@ class EdgeBundles : public MachineFunctionPass {
/// 2*BB->getNumber()+1 -> Outgoing bundle.
IntEqClasses EC;
/// Blocks - Map each bundle to a list of basic block numbers.
SmallVector<SmallVector<unsigned, 8>, 4> Blocks;
public:
static char ID;
EdgeBundles() : MachineFunctionPass(ID) {}
@@ -40,6 +44,9 @@ public:
/// getNumBundles - Return the total number of bundles in the CFG.
unsigned getNumBundles() const { return EC.getNumClasses(); }
/// getBlocks - Return an array of blocks that are connected to Bundle.
ArrayRef<unsigned> getBlocks(unsigned Bundle) { return Blocks[Bundle]; }
/// getMachineFunction - Return the last machine function computed.
const MachineFunction *getMachineFunction() const { return MF; }