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: Miscompilation of remainder expressions

From: Robert Dewar <dewar at adacore dot com>
To: Morten Welinder <mwelinder at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 18 Jan 2007 17:36:23 -0500
Subject: Re: Miscompilation of remainder expressions
References: <118833cc0701181415i371db108tfd7e9706d7287359@mail.gmail.com>

Morten Welinder wrote:

For sure a/b is undefined


In C, it is.  In assembler it is perfectly well defined, i.e., it
traps.  But how is the
trap handler supposed to know the source of a given instruction?

M.


Sure it traps, but what happens when that trap occurs is of course
O/S dependent, there is no guarantee of the effect.

Follow-Ups:
- Re: Miscompilation of remainder expressions
  - From: Joe Buck

References:
- Re: Miscompilation of remainder expressions
  - From: Morten Welinder

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