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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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7
lib/CodeGen/LiveIntervalAnalysis.cpp
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@@ -20,6 +20,7 @@
#include "VirtRegMap.h"
#include "llvm/Value.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/CalcSpillWeights.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
@@ -1706,10 +1707,10 @@ LiveIntervals::getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
return (isDef + isUse) * lc;
}
void
LiveIntervals::normalizeSpillWeights(std::vector<LiveInterval*> &NewLIs) {
static void normalizeSpillWeights(std::vector<LiveInterval*> &NewLIs) {
for (unsigned i = 0, e = NewLIs.size(); i != e; ++i)
normalizeSpillWeight(*NewLIs[i]);
NewLIs[i]->weight =
normalizeSpillWeight(NewLIs[i]->weight, NewLIs[i]->getSize());
}
std::vector<LiveInterval*> LiveIntervals::