Kai Luo b200c5180e Reland [MachineCopyPropagation] Extend MCP to do trivial copy backward propagation. ...

Fix assertion error
```
bool llvm::MachineOperand::isRenamable() const: Assertion `Register::isPhysicalRegister(getReg()) && "isRenamable should only be checked on physical registers"' failed.
```
by checking if the register is 0 before invoking `isRenamable`.

2019-12-05 14:32:11 +08:00

29 KiB

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