Re: [PING] Target hook for rewriting inline asm constraints

["Andreas Krebbel" <Andreas.Krebbel@de.ibm.com>]

Hi Michael,

thanks for your review.  I'll address the points you mentioned.

> Now, getting on the broader scope issues about the patch, I can sympathize with
> the desire, but I think this is really opening up a can of worms if we let the
> back end rewrite asm constraints like this.  I'm also not sure I understand
> what the exact problem is.  I would imagine if you have address modes that are
> allowed in some cases, but not others, this is better expressed in
> GO_IF_MODE_DEPENDENT_ADDRESS instead of GO_IF_LEGITIMATE_ADDRESS.

In order to support new address formats there is no other way than
extending the GO_IF_LEGITIMATE_ADDRESS hook.  All addresses not
accepted by this hook will be reloaded into a register.

The GO_IF_MODE_DEPENDENT_ADDRESS tells the middle end if an address
should be interpreted depending on the mode of the memory access.
How do you think this can help me here?

Bye,

-Andreas-