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Symbolize the default instruction distance.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127013 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-04 18:36:51 +00:00
parent e90756d8a0
commit bee41501fa
2 changed files with 13 additions and 10 deletions
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17
include/llvm/CodeGen/CalcSpillWeights.h
View File

@ -11,7 +11,7 @@
#ifndef LLVM_CODEGEN_CALCSPILLWEIGHTS_H
#define LLVM_CODEGEN_CALCSPILLWEIGHTS_H
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/ADT/DenseMap.h"
namespace llvm {
@ -29,15 +29,12 @@ namespace llvm {
/// @param Size Size of live interval as returnexd by getSize()
///
static inline float normalizeSpillWeight(float UseDefFreq, unsigned Size) {
// The magic constant 200 corresponds to approx. 25 instructions since
// SlotIndexes allocate 8 slots per instruction.
//
// The constant is added to avoid depending too much on accidental SlotIndex
// gaps for small intervals. The effect is that small intervals have a spill
// weight that is mostly proportional to the number of uses, while large
// intervals get a spill weight that is closer to a use density.
//
return UseDefFreq / (Size + 200);
// The constant 25 instructions is added to avoid depending too much on
// accidental SlotIndex gaps for small intervals. The effect is that small
// intervals have a spill weight that is mostly proportional to the number
// of uses, while large intervals get a spill weight that is closer to a use
// density.
return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
}
/// VirtRegAuxInfo - Calculate auxiliary information for a virtual

6
include/llvm/CodeGen/SlotIndexes.h
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@ -110,6 +110,12 @@ namespace llvm {
}
public:
enum {
/// The default distance between instructions as returned by distance().
/// This may vary as instructions are inserted and removed.
InstrDist = 2*NUM
};
static inline SlotIndex getEmptyKey() {
return SlotIndex(0, 1);
}