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Add getScaledIntervalSize, which gives a measure of the size of an interval that is independent of the scaling of

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the function due to empty index slots.  This is suitable for use in backend heuristics that need to reason about the density
of an interval.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52652 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-06-23 23:25:37 +00:00
parent cb41e6bf52
commit 72e04099c6
1 changed files with 9 additions and 0 deletions
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9
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@ -169,6 +169,15 @@ namespace llvm {
return MBB2IdxMap[MBBNo].second;
}
/// getIntervalSize - get the size of an interval in "units,"
/// where every function is composed of one thousand units. This
/// measure scales properly with empty index slots in the function.
unsigned getScaledIntervalSize(LiveInterval& I) {
// Factor of 250 comes from 1000 units per function divided
// by four slots per instruction.
return (250 * I.getSize()) / i2miMap_.size();
}
/// getMBBFromIndex - given an index in any instruction of an
/// MBB return a pointer the MBB
MachineBasicBlock* getMBBFromIndex(unsigned index) const {