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Don't use getNextOperandForReg() in RAFast.
That particular optimization was probably premature anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161541 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -201,20 +201,16 @@ int RAFast::getStackSpaceFor(unsigned VirtReg, const TargetRegisterClass *RC) {
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/// its virtual register, and it is guaranteed to be a block-local register.
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///
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bool RAFast::isLastUseOfLocalReg(MachineOperand &MO) {
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// Check for non-debug uses or defs following MO.
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// This is the most likely way to fail - fast path it.
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MachineOperand *Next = &MO;
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while ((Next = Next->getNextOperandForReg()))
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if (!Next->isDebug())
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return false;
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// If the register has ever been spilled or reloaded, we conservatively assume
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// it is a global register used in multiple blocks.
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if (StackSlotForVirtReg[MO.getReg()] != -1)
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return false;
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// Check that the use/def chain has exactly one operand - MO.
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return &MRI->reg_nodbg_begin(MO.getReg()).getOperand() == &MO;
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MachineRegisterInfo::reg_nodbg_iterator I = MRI->reg_nodbg_begin(MO.getReg());
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if (&I.getOperand() != &MO)
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return false;
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return ++I == MRI->reg_nodbg_end();
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}
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/// addKillFlag - Set kill flags on last use of a virtual register.
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