[2/n] Partial IT block deprecation in ARMv8 AArch32 - define_cond_exec machinery

["Kyrylo Tkachov" <kyrylo dot tkachov at arm dot com>]

Hi all,

This patch adds the attributes to arm.md that are used to control the
conditions under which we can predicate an insn.
We use the new attributes field for define_cond_exec that was defined in
a recent patch. Whenever an insn is predicated through define_cond_exec,
it has the attribute "predicated" set to "yes".
The "enabled" definition is updated to take "predicated" and
arm_restric_it into account to disable the predicated version when
appropriate.

Now, if we want to disable the predicated version of an alternative for
arm_restrict_it we leave the "predicable" attribute as "yes" and set the
"predicable_short_it" attribute to "no".
The enabled_for_depr_it attribute is used to disable alternatives in
some cases where explicit IT blocks are used in the output template.


Ok for trunk?

2013-06-05  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/arm/arm.md (enabled_for_depr_it): New attribute.
	(predicable_short_it): Likewise.
	(predicated): Likewise.
	(enabled): Handle above.
	(define_cond_exec): Set predicated attribute to yes.

Attachment: 03-enablers.patch
Description: Binary data