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...eads and writes to intrinsics without any reference to a global variable. - I'm letting the name to be an argument (as opposed to metadata) for simplicity. It might be better to use metadata or some other way. Is that a reasonable expectation of the implementation? Now, onto specifics... 1. RegisterByName I couldn't find a way to get a register by name. I could teach the TableGen backend to print an additional table with a StringSwitch on <Target>GenRegisterInfo.inc and add a method getRegisterByName(char *), but that would expose a huge number of unwanted register classes which could op...