[patch] Improve stack checking on PowerPC

[Eric Botcazou]

> Okay, but would you mind using the value "4" for the UNSPEC at the
> beginning of the list?  I would like to fill in the empty values at
> the beginning of the list and this instruction seems particularly
> appropriate.

OK, thanks, installed with this change.  And I also took this opportunity to 
clarify/complete the docs.


2009-12-14  Eric Botcazou  <ebotcazou@adacore.com>

	* doc/tm.texi (STACK_CHECK_PROTECT): Document alternate default.
	* doc/md.texi (check_stack): Clarify.
	(probe_stack): Likewise.
        * config/rs6000/rs6000.md (UNSPEC_PROBE_STACK): New constant.
        (probe_stack): New insn.


-- 
Eric Botcazou
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