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[Ada] Fix Forward_Eliminate routine to allow use with complex matrices

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Geert Bosch <bosch at adacore dot com>
Date: Thu, 13 Oct 2011 06:53:08 -0400
Subject: [Ada] Fix Forward_Eliminate routine to allow use with complex matrices

Use proper "abs" function returning a real for comparing magnitude of
elements. The previous local implementation using "-" only was correct
for real values. This prepares for the pure Ada reimplementation of
Generic_Complex_Arrays.

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

2011-10-13  Geert Bosch  <bosch@adacore.com>

	* s-gearop.ads (Forward_Eliminate): Add "abs" formal function
	returning a Real.
	* s-gearop.adb (Forward_Eliminate): Remove local "abs" function
	and use formal.
	* a-ngrear.adb (Forward_Eliminate): Adjust instantiation for
	new profile.

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