Can eieio PowerPC instruction be used on MPC5566?

It is mandatory to the architecture, so yes, you can use it. On some implementations (like the 603e) it is in effect a NOP, because the core does not do reordering anyway. But including it will guarantee code portability between platforms so it is a good idea. You do not have to alter any registers to use it nor will it have any direct effect on any registers.

Dimiter

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I've always thought that "eieio" was the most musical opcode of any cpu. Do you think IBM picked the name first, then tried to figure out a plausible sounding effect for the instruction?

Microcontrollers,

make

I think there is no eieio instruction in MPC5566. Check pages 3-20 and 3-21 of the e200z6 core reference manual.

There is no eieio instruction listed in the list of instructions sorte alphabetically.

The e500/e200 core does indeed treat eieio a bit differently, they call it "MBAR" there. The opcode is the same, and there is a HID register bit to switch the function of the eieio between traditional and e200/500 core like indeed. Using it wherever you would have used it formerly is still a good idea, though.

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Oroginal message:

No idea what the guy at IBM did, but I know how I make abbreviations. I got enough training on that during the up to 6 characters times of old Motorola assemblers; I still tend to make labels that short, although they can be longer. If something memorable, funny, or too ugly sounding to be memorized on the spot comes to mind, I just do not waste time and I use it... I also like the eieio name, does not need a second look at it to be remembered (unlike many of the PPC instructions from the architecture, the assembler in that form is not really usable for anything larger than a page or so). The 6809 syntax used to call "SEX" the sign extend opcode - not bad, hits you by surprise and here I still remember it after all these years.

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Original message:

Ok, going off-topic: The Atari Jaguar CPU had nice a opcode : sharq (shift arithmetic right quick).

BTW: Not only the "a label has max. 6 characters" influenced a lot. Also the good 8+3 filenames ;-) (I'd say 99% of my source files,still are 8+3 :-)

Wasn't it the ancient masm which allowed an arbitrary length for the labels, but just took the first 8 into account: It did cost me some nightly hours.