On Tue, May 20, 2008 at 2:30 PM, Omar Torres <[EMAIL PROTECTED]> wrote:
> By looking at other ports, I learned that I can detect when this happens
> by using the reg_overlap_mentioned_p(). Here is one case:
> (insn 43 115 74 (set (reg:HI 7 %i0h)
> (mem/s/j:HI (plus:HI (reg/f:HI 7 %i0h [orig:39 source ] [39])
> (const_int 2 [0x2])) [0 <variable>.r+0 S2 A8])) 3
> {*movhi} (nil)
> (nil))
>
> I need to tell the compiler not to use as destination the same base
> register when doing index operations. Any suggestions on how do I that?
Early clobber, that is using "=&r" as the constraint. Though may I
suggest that you split before reload/ra.
-- Pinski
