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[Ada] Improve computation of real bounds of type conversion expressions

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Yannick Moy <moy at adacore dot com>
Date: Tue, 25 Apr 2017 06:08:11 -0400
Subject: [Ada] Improve computation of real bounds of type conversion expressions
Authentication-results: sourceware.org; auth=none

Function Determine_Range_R is used in GNATprove to compute the maximal
bounds of floating-point expressions. This computation now also deals
with type conversion expressions, for conversions from integer to float.
This allows to prove more checks (range and overflow) in GNATprove with
a simple interval analysis rather than with calling provers.

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

2017-04-25  Yannick Moy  <moy@adacore.com>

	* checks.adb (Determine_Range_R): Special case type conversions
	from integer to float in order to get bounds in that case too.
	* eval_fat.adb (Machine): Avoid issuing warnings in GNATprove
	mode, for computations involved in interval checking.

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