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This section explains how to describe what registers the target machinehas, and how (in general) they can be used.
The description of which registers a specific instruction can use isdone with register classes; seeRegister Classes. For informationon using registers to access a stack frame, seeRegisters That Address the Stack Frame.For passing values in registers, seePassing Arguments in Registers.For returning values in registers, seeHow Scalar Function Values Are Returned.