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Avoid scanning the long tail of physreg operands on calls
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103823 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -663,12 +663,18 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) {
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// First scan.
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// Mark physreg uses and early clobbers as used.
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// Find the end of the virtreg operands
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unsigned VirtOpEnd = 0;
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = MI->getOperand(i);
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if (!MO.isReg()) continue;
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unsigned Reg = MO.getReg();
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if (!Reg || !TargetRegisterInfo::isPhysicalRegister(Reg) ||
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ReservedRegs.test(Reg)) continue;
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if (!Reg) continue;
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if (TargetRegisterInfo::isVirtualRegister(Reg)) {
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VirtOpEnd = i+1;
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continue;
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}
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if (ReservedRegs.test(Reg)) continue;
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if (MO.isUse()) {
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usePhysReg(MO);
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} else if (MO.isEarlyClobber()) {
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@ -677,11 +683,10 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) {
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}
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}
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// Second scan.
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// Allocate virtreg uses and early clobbers.
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// Collect VirtKills
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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for (unsigned i = 0; i != VirtOpEnd; ++i) {
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MachineOperand &MO = MI->getOperand(i);
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if (!MO.isReg()) continue;
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unsigned Reg = MO.getReg();
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