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Change the heuristics used in the coalescer, register allocator, and within

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live intervals itself to use an instruction count approximation that is 
not affected by inserting empty indices.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53937 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2008-07-22 22:46:49 +00:00
parent 38bcec13e8
commit a1566f2e12
5 changed files with 29 additions and 14 deletions
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6
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -87,6 +87,8 @@ void LiveIntervals::computeNumbering() {
mi2iMap_.clear();
i2miMap_.clear();
FunctionSize = 0;
// Number MachineInstrs and MachineBasicBlocks.
// Initialize MBB indexes to a sentinal.
MBB2IdxMap.resize(mf_->getNumBlockIDs(), std::make_pair(~0U,~0U));
@ -102,6 +104,8 @@ void LiveIntervals::computeNumbering() {
assert(inserted && "multiple MachineInstr -> index mappings");
i2miMap_.push_back(I);
MIIndex += InstrSlots::NUM;
FunctionSize++;
}
if (StartIdx == MIIndex) {
@ -1789,7 +1793,7 @@ addIntervalsForSpills(const LiveInterval &li,
for (unsigned i = 0, e = NewLIs.size(); i != e; ++i) {
LiveInterval *LI = NewLIs[i];
if (!LI->empty()) {
LI->weight /= LI->getSize();
LI->weight /= getApproximateInstructionCount(*LI);
if (!AddedKill.count(LI)) {
LiveRange *LR = &LI->ranges[LI->ranges.size()-1];
unsigned LastUseIdx = getBaseIndex(LR->end);