Re: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code

Andreas Schwab
2008-05-20T22:47:44Z

Trent Piepho <tpiepho@freescale.com> writes:

> It's the _le versions that have a problem, since we can't get gcc to just use
> the register indexed mode. It seems like an obvious thing to have a
> constraint for, but I guess there weren't enough instructions that only come
> in 'x' versions to bother with it. There is a 'Z' constraint, "Memory operand
> that is an indexed or indirect from a register", but I tried it and it can use
> both "rb,ri" and "disp(rb)" forms. Actually, I'm not sure how 'Z' is any
> different than "m"?

'Z' will never emit a non-zero constant displacement.

Andreas.

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