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Changes
→General-Purpose Registers
* '''r9-r15 are for temporary values (may get trampled)'''
* r16-r18 are used for intra-procedure-call and platform values (avoid)
* '''The called routine is expected to preserve r19-r28*** These registers are generally safe to use in your program.'''
* r29 and r30 are used as the frame register and link register (avoid)
