From: Jonathan Wakely <jwakely.gcc@gmail.com>
To: Florian Weimer <fweimer@redhat.com>
Cc: Jonny Grant <jg@jguk.org>, gcc-help <gcc-help@gcc.gnu.org>
Subject: Re: shift-count-overflow possible issue on 64bit type
Date: Mon, 25 Nov 2019 12:22:00 -0000 [thread overview]
Message-ID: <CAH6eHdS7yd-buUmLUhrhkWwZ5LObzrUkbdBu-zyYN8j=GM7s7g@mail.gmail.com> (raw)
In-Reply-To: <87eexwi1yb.fsf@oldenburg2.str.redhat.com>
On Mon, 25 Nov 2019 at 12:18, Florian Weimer wrote:
>
> * Jonathan Wakely:
>
> > Why do you expect a different result for these?
> >
> > A small = 1 << 40;
> > B big = 1 << 40;
> >
> > In both cases the expression is 1 << 40, the type of A or B is irrelevant.
>
> Some languages define integer literals in such a way that they have
> types which do not exist at run time and evaluate constant expressions
> with infinite precision.
Yes, but C and C++ do not do that. Understanding the language you're
programming in is important.
prev parent reply other threads:[~2019-11-25 12:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-23 13:56 Jonny Grant
2019-11-23 14:16 ` Ponnuvel Palaniyappan
2019-11-24 1:15 ` Jonny Grant
2019-11-25 9:30 ` Jonathan Wakely
2019-11-25 12:02 ` Cristiano Di Buduo
2019-11-26 12:41 ` Jonny Grant
2019-11-25 12:18 ` Florian Weimer
2019-11-25 12:22 ` Jonathan Wakely [this message]
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