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Re: RS6000 call pattern clobbers
- From: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
- To: joernr at arc dot com
- Cc: dje at watson dot ibm dot com, gcc at gcc dot gnu dot org
- Date: Mon, 26 Feb 2007 21:03:49 EST
- Subject: Re: RS6000 call pattern clobbers
- References: <20070226184044.GA30412@elsdt-razorfish.arc.com>
> Actually, this depended on SMALL_REGISTER_CLASSES. If the target was not
> marked has having SMALL_REGISTER_CLASSES, any explicitly used hard register
> would not be used for register and/or spill allocations anywhere in the
> function.
That's one issue, but I'm not sure is the only one. Also note that the
RS/6000 port predated SMALL_REGISTER_CLASS, though it would take some
significant archeology to determine when the line in question was added.