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Move more fragments of spill weight calculation into CalcSpillWeights.h

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Simplify the spill weight calculation a bit by bypassing
getApproximateInstructionCount() and using LiveInterval::getSize() directly.
This changes the computed spill weights, but only by a constant factor in each
function. It should not affect how spill weights compare against each other, and
so it shouldn't affect code generation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125530 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-02-14 23:15:38 +00:00
parent 3fc178ffda
commit eb9f040f0d
4 changed files with 25 additions and 16 deletions
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11
include/llvm/CodeGen/LiveIntervalAnalysis.h
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@@ -75,14 +75,6 @@ namespace llvm {
// Calculate the spill weight to assign to a single instruction.
static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth);
// After summing the spill weights of all defs and uses, the final weight
// should be normalized, dividing the weight of the interval by its size.
// This encourages spilling of intervals that are large and have few uses,
// and discourages spilling of small intervals with many uses.
void normalizeSpillWeight(LiveInterval &li) {
li.weight /= getApproximateInstructionCount(li) + 25;
}
typedef Reg2IntervalMap::iterator iterator;
typedef Reg2IntervalMap::const_iterator const_iterator;
const_iterator begin() const { return r2iMap_.begin(); }
@@ -461,9 +453,6 @@ namespace llvm {
DenseMap<unsigned,unsigned> &MBBVRegsMap,
std::vector<LiveInterval*> &NewLIs);
// Normalize the spill weight of all the intervals in NewLIs.
void normalizeSpillWeights(std::vector<LiveInterval*> &NewLIs);
static LiveInterval* createInterval(unsigned Reg);
void printInstrs(raw_ostream &O) const;