PTR-PLUS merge into the mainline

Roman Zippel zippel@linux-m68k.org
Thu Jul 5 21:17:00 GMT 2007


Hi,

On Thu, 5 Jul 2007, Richard Guenther wrote:

> > How should this be optimized within the context of your canonicalization?
> 
> For example by making fold_plusminus_mult_expr do what its comment
> suggest, "No identical multiplicands; see if we can find a common
> power-of-two factor ..."
> 
> Can you try the following and see if it helps m68k?

The problem isn't specific to m68k, it's a problem for i386 and probably 
others as well.
The patch is unfortunately no improvement, the problem is the canonical 
form for addresses is (p * c) + o, which directly conflicts with yours.

bye, Roman



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