PTR-PLUS merge into the mainline

[Daniel Berlin]

On 7/5/07, Roman Zippel <zippel@linux-m68k.org> wrote:
> Hi,
>
> On Thu, 5 Jul 2007, I wrote:
>
> > Exactly and that's why I think this transformation is done far too early.
> > It doesn't make sense that these two examples produce different code:
> >
> > int foo1(int x)
> > {
> >       return (x * 4) + 4;
> > }
> > int foo2(int x)
> > {
> >       int y = x * 4;
> >       return y + 4;
> > }
>
> Another example:
>
> int foo3(int x, int y)
> {
>         return (x * y) + (y * 5);
> }
> int foo4(int x, int y)
> {
>         x *= y;
>         return x + (y * 5);
> }
>
> Here the generated code depends on how the constant multiply is expanded,
> so that combine can do the optimization.

This is easily fixable
see the patch i posted to 32120.