For a register operand, you must use one of the register names of the appropriate kind for the instruction. The register names are case-sensitive. You also can use a symbolic name for an argument or local variable that was assigned to a register.
The general registers are SP , r0 to r31 , and gpr0 to gpr31 . The floating-point registers are fp0 to fp31 and f0 to f31 . The condition registers are cr0 to cr7 .