Re: Still can't make stfiwx actually store directly, but...

[Geoffrey Keating <geoffk at apple dot com>]

On 17/05/2005, at 4:59 PM, Zack Weinberg wrote:

> gkeating@apple.com (Geoffrey Keating) writes:
>
>
> > This patch has no effect.
> >
> > It ought to have an effect.  What it should do is make a short chunk
> > of code like this:
> >
> > void foo(int *x, double d)
> > { *x = d; }
> >
> > generate code like:
> >
> >         fctiwz f0,f1
> >         stfiwx f0,0,r3
> >         blr
> >
> > instead of pointlessly generating a temporary, like:
> >
> >         fctiwz f0,f1
> >         addi r2,r1,-24
> >         stfiwx f0,0,r2
> >         lwz r0,-24(r1)
> >         stw r0,0(r3)
> >         blr
>
> Hm, you'd think combine could put it back together again... too late
> to not allocate the stack slot, but at least you'd save the store and
> load.

Combine only knows about pseudos, not memory locations, unfortunately.

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