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2013 Jun 25
2
[LLVMdev] Adding a new ARM RegisterClass
I'm looking at an issue where we want a particular pseudo-instruction to choose from a set of registers that is not included in the existing set of RegisterClass definitions. More concretely, there is a RegisterClass in ARMRegisterInfo.td defined as def rGPR : RegisterClass<"ARM", [i32], 32, (sub GPR, SP, PC)> { let AltOrders = [(add LR, rGPR), (trunc rGPR, 8)]; let