I want to know meaning of r12 register.

Hi expert.

I want to know meaning of r12 regiseter.

this register some time using frame pointer (compiler option)

I think caller save register is r0-r3, and callee save register is r4~r15. but my code not guarantee r12 register value.

so plese explain r12 register.

Thanks.

I am a beginner so please expalin easyly!! hehe

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