This is the mail archive of the gcc@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]

Re: Abusive (?) promotions to int

From: Jim Wilson <wilson at specifixinc dot com>
To: Ian Lance Taylor <ian at wasabisystems dot com>
Cc: Alexandre Courbot <Alexandre dot Courbot at lifl dot fr>, gcc at gcc dot gnu dot org
Date: Wed, 24 Sep 2003 22:00:31 -0700
Subject: Re: Abusive (?) promotions to int
References: <E04CF3F88ACBD5119EFE00508BBB21210C4BE0CC@exch-01.noida.hcltech.com> <m38yodeqs5.fsf@gossamer.airs.com>

Ian Lance Taylor wrote:

True, but compilers are also permitted to follow the as-if rule: if
you can't detect a difference, then there is no difference.

There is code in the C front end to perform this optimization. Search for "shorten", "short_compare", and "short_shift" in build_binary_operation in c-typeck.c. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

References:
- RE: Abusive (?) promotions to int
  - From: Rakesh Kumar - Software, Noida
- Re: Abusive (?) promotions to int
  - From: Ian Lance Taylor

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