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[Ada] Preliminary work to implement pragma Loop_Optimize

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Eric Botcazou <botcazou at adacore dot com>
Date: Wed, 6 Feb 2013 05:47:35 -0500
Subject: [Ada] Preliminary work to implement pragma Loop_Optimize

This is the front-end implementation of the new Loop_Optimize pragma, which
makes it possible for the programmer to control the optimizations applied to
loops on an individual basis.

Tested on x86_64-pc-linux-gnu, committed on trunk

2013-02-06  Eric Botcazou  <ebotcazou@adacore.com>

	* snames.ads-tmpl (Name_Loop_Optimize, Name_No_Unroll,
	Name_Unroll, Name_No_Vector, Name_Vector): New pragma-related
	names.
	(Pragma_Id): Add Pragma_Loop_Optimize value.
	* par-prag.adb (Prag): Handle Pragma_Loop_Optimize.
	* sem_prag.adb (Check_Loop_Invariant_Variant_Placement): Rename to...
	(Check_Loop_Pragma_Placement): ...this.
	(Analyze_Pragma)
	<Pragma_Loop_Invariant>: Adjust to above renaming.
	<Loop_Variant>: Likewise.
	 <Pragma_Loop_Optimize>: Implement new pragma Loop_Optimize.
	(Sig_Flags): Add Pragma_Loop_Optimize.
	* gnat_rm.texi (Implementation Defined Pragmas): Add Loop_Optimize.
	* gnat_ugn.texi (Vectorization of loops): Mention Loop_Optimize.

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