[PATCH 10/15] powerpc: fixes for instructions not using correct register naming

Andreas Schwab schwab at linux-m68k.org
Sat Jun 9 19:39:43 EST 2012

Benjamin Herrenschmidt <benh at kernel.crashing.org> writes:

> On Sat, 2012-06-09 at 08:53 +0200, Andreas Schwab wrote:
>> > The macro system we use cannot do that (it will prefix with REG_),
>> since
>> > both arguments are registers we must use R0 in this case.
>> So define a ___PPC_RA0 macro that doesn't do that.
> But then we lose the checking for other instructions :-)

??? There is no loss of checking for instructions that do not use

> Unless we start being nasty and defining a different macro form for RA
> which can be 0...

That's what ___PPC_RA0 is all about.

> I'd rather not go there unless we absolutely have to...

Having to use R0 for an insn that does *not* use r0 is clearly a step

> What would be nice also would be if we had a gas option to enforce the
> use of % for register names.

If gas is ever changed that way you have to be explict about 0 vs. %r0


Andreas Schwab, schwab at linux-m68k.org
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