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Trivially re-materializable instructions have spill weights that are half of what it would be otherwise. 

llvm-svn: 35658
This commit is contained in:
Evan Cheng 2007-04-04 07:04:55 +00:00
parent 12e2843475
commit 2bf2aadd9a
1 changed files with 6 additions and 6 deletions
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12
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -164,13 +164,13 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
unsigned reg = rep(mop.getReg()); unsigned reg = rep(mop.getReg());
mii->getOperand(i).setReg(reg); mii->getOperand(i).setReg(reg);
// If the definition instruction is re-materializable, its spill
// weight is zero.
LiveInterval &RegInt = getInterval(reg); LiveInterval &RegInt = getInterval(reg);
if (!RegInt.remat) { float w = (mop.isUse()+mop.isDef()) * powf(10.0F, (float)loopDepth);
RegInt.weight += // If the definition instruction is re-materializable, its spill
(mop.isUse() + mop.isDef()) * pow(10.0F, (int)loopDepth); // weight is half of what it would have been normally.
} if (RegInt.remat)
w /= 2;
RegInt.weight += w;
} }
} }
++mii; ++mii;