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Precompute block frequencies, pow() isn't free.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126975 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-04 00:58:40 +00:00
parent 13ba2dab63
commit 40a42a2cca
3 changed files with 15 additions and 17 deletions
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9
lib/CodeGen/SpillPlacement.h
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@ -27,6 +27,7 @@
#ifndef LLVM_CODEGEN_SPILLPLACEMENT_H
#define LLVM_CODEGEN_SPILLPLACEMENT_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
namespace llvm {
@ -35,7 +36,6 @@ class BitVector;
class EdgeBundles;
class MachineBasicBlock;
class MachineLoopInfo;
template <typename> class SmallVectorImpl;
class SpillPlacement : public MachineFunctionPass {
struct Node;
@ -48,6 +48,9 @@ class SpillPlacement : public MachineFunctionPass {
// caller.
BitVector *ActiveNodes;
// Block frequencies are computed once. Indexed by block number.
SmallVector<float, 4> BlockFrequency;
public:
static char ID; // Pass identification, replacement for typeid.
@ -91,7 +94,9 @@ public:
/// getBlockFrequency - Return the estimated block execution frequency per
/// function invocation.
float getBlockFrequency(const MachineBasicBlock*);
float getBlockFrequency(unsigned Number) const {
return BlockFrequency[Number];
}
private:
virtual bool runOnMachineFunction(MachineFunction&);