Alan Modra - Re: LEGITIMIZE_RELOAD_ADDRESS vs address_reloaded (original) (raw)

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• From: Alan Modra
• To: Ulrich Weigand
• Cc: gcc at gcc dot gnu dot org, David Edelsohn
• Date: Mon, 28 Nov 2005 09:58:56 +1030
• Subject: Re: LEGITIMIZE_RELOAD_ADDRESS vs address_reloaded
• References: <20051125040915.GM19599@bubble.grove.modra.org> <200511251820.jAPIKqJ7016569@53v30g15.boeblingen.de.ibm.com>

On Fri, Nov 25, 2005 at 07:20:52PM +0100, Ulrich Weigand wrote:

c) Modify the ppc 'Z' constraint to match the indexed address reload generates. This would rely on the pattern we generate in LEGITIMIZE_RELOAD_ADDRESS never being generated elsewhere. [snip]

Overall, I'd tend to prefer something along the lines of (c), in particular as it would also catch the cases where LEGITIMIZE_RELOAD_ADDRESS isn't actually involved, as you note:

Thanks. I went ahead and implemented this, and yes, the testcase in pr24997 has better code in other places too.

-- Alan Modra IBM OzLabs - Linux Technology Centre

• References:
  • LEGITIMIZE_RELOAD_ADDRESS vs address_reloaded
    * From: Alan Modra
  • Re: LEGITIMIZE_RELOAD_ADDRESS vs address_reloaded
    * From: Ulrich Weigand