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I have started learning Assembly for PowerPC and came across MPC82x core which is built around powerpc core with QUICC Engine which is a separate RISC core.

Now I when looked into the instruction set of MPC82x found it different than that of traditional that of PPC.

For example

add rD,rA,rB

But PowerPC register are from r0,r31.

What are these rD,rA,rB resister?

Is there any difference exist between normal PowerPc Core and MPC82x Core?

Amit Singh Tomar
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    rD, rA, rB look like placeholders in your typical CPU manual. D, A and B are variables, substitute numbers 0..31. The manual is saying that this command acts on registers (as opposed to memory locations or constants). D probably means destinations, A and B are typical generic names for variables. There's probably a register guide in the beginning of the manual - see and make sure your core has all same registers as a vanilla PPC (with maybe more for QUICC). – Seva Alekseyev Jul 08 '14 at 14:14
  • The D, A, and B also typically are referenced in the instruction encoding so you can see where in the encoding the destination register and operand registers live. – old_timer Jul 08 '14 at 17:37

1 Answers1

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No difference really. Look at the specification:

http://en.wikipedia.org/wiki/Power_Architecture

MPCxxxx range of PPC are from Freescale, and others like PPC440 are from AMCC (used to be IBM).

If u are interested in the history, here is the link:

http://en.wikipedia.org/wiki/List_of_PowerPC_processors

Peter Teoh
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