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Avoid iterating every operand of an instruction in StrongPHIElimination, since
we are only interested in the defs when discovering interferences. This is a 28% speedup running StrongPHIElimination on 403.gcc. llvm-svn: 122596
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@ -471,10 +471,9 @@ StrongPHIElimination::SplitInterferencesForBasicBlock(
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DenseMap<unsigned, unsigned>& ImmediateDominatingParent) {
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for (MachineBasicBlock::iterator BBI = MBB.begin(), BBE = MBB.end();
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BBI != BBE; ++BBI) {
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for (unsigned i = 0, e = BBI->getNumOperands(); i != e; ++i) {
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MachineOperand& MO = BBI->getOperand(i);
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if (!MO.isReg() || !MO.isDef())
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continue;
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for (MachineInstr::const_mop_iterator I = BBI->operands_begin(),
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E = BBI->operands_end(); I != E && I->isReg() && I->isDef(); ++I) {
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const MachineOperand& MO = *I;
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unsigned DestReg = MO.getReg();
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if (!DestReg || !TargetRegisterInfo::isVirtualRegister(DestReg))
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