GNU replacing obsolete assembly instructions in PowerPc architecture

[Segher Boessenkool]

On Mon, Mar 18, 2019 at 01:13:32PM +0100, David Brown wrote:
> But you have to realise that neither the compiler nor the assembler is
> changing anything here.  "mftb" is not an instruction in its own right
> on most PPC cores

It exists on *all* CPUs.  It has been a basic mnemonic since PowerPC 1.xx,
and it is still part of Power ISA 3.0B.

(POWER had 5-bit SPRs, not 10-bit, btw -- and no TB either, there was an
RTC instead).


Segher