Messages in this thread | | | Date | Tue, 20 May 2008 16:14:49 -0700 (PDT) | From | Trent Piepho <> | Subject | Re: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code |
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On Wed, 21 May 2008, Andreas Schwab wrote: > 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.
It's too bad gas doesn't appear to be smart enough to turn: stwbrx 0, 0(3) -or- stwbr 0, 0(3)
into the desired: stwbrx 0, 0, 3
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