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58296
2017 Dec 22
4
Canonical way to handle zero registers?
I looked around the codebase and didn't see anything that obviously looked
like the natural place to turn constant zero immediates into zero-registers
(i.e. registers that always return zero when read). Right now we are
expanding them in ISelLowering::LowerOperation but that seems too early.
The specific issue I'm hitting is that we have a register that reads as -1
and so when we replace