This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

[Ada] Validity checks on boolean expressions

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Ed Schonberg <schonberg at adacore dot com>
Date: Fri, 10 Sep 2010 11:45:42 +0200
Subject: [Ada] Validity checks on boolean expressions

The value of a boolean expression or short-circuit operation is valid if the
elementary operands of the expression are valid. This patch removes validity
checks that were superfluous, and led to a quadratic expansion in the generated
code for short-circuit expressions with multiple alternatives.
No simple example available.

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

2010-09-10  Ed Schonberg  <schonberg@adacore.com>

	* checks.adb (Ensure_Valid): If the expression is a boolean expression
	or short-circuit operation, do no emit a validity check: only the
	elementary operands of the expression need checking.

Attachment: difs
Description: Text document

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]