Re: Don't use auto inc/dec addresses in asm operands

[Richard Henderson <rth at redhat dot com>]

On 07/10/2009 03:54 AM, Richard Sandiford wrote:
> This patch fixes a case in which an AIX compiler would use a
> PRE_INC address inside an asm "m" operand.  We can't rely on
> asm operands to do increments and decrements like this,
> because the asm can legitimately write to the memory more
> than once or (as here) not write to it at all.

Not to say your patch shouldn't go in but FYI, there's an S constraint 
on ia64 that is used to prohibit autoinc addresses in asms.  It may be 
that can be simplified or eliminated.


r~