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2019 Feb 17
2
New to LLVM. Need help getting available register
Is it possible to get a virtual register and then use that to create a real register? I've seen it done in unittests/CodeGen/MachineInstrTest.cpp like this:
unsigned VirtualDef1 = -42;
VD1VU->addOperand(*MF,
MachineOperand::CreateReg(VirtualDef1, /*isDef*/ true));
But when I do that in my code I get an assertion so I wasn't sure if it's legal or not.
Thanks.