From: Brian Dessent <brian@dessent.net>
To: Terry Frankcombe <terry@chem.gu.se>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Internal representation of double variables - 3.4.6 vs 4.1.0
Date: Fri, 09 Mar 2007 19:08:00 -0000 [thread overview]
Message-ID: <45F1AD7C.CE30AC9A@dessent.net> (raw)
In-Reply-To: <1173466047.5215.11.camel@fkpc167>
Terry Frankcombe wrote:
> My understanding of -ffloat-store is that it only works when there's
> actually a variable involved. Is that right?
Right, it's not a guaranteed fix.
> (I'm used to working with Compaq and Intel Fortran compilers, where you
> can set flags that say, effectively, "Use a standard, well-defined and
> portable floating point arithmetic model irrespective of what the CPU's
> trying to do.")
I'd say you pretty much get that with -mfpmath=sse. The only reason
anyone should ever use 387 is if binary compatibility with ancient
pre-SSE pentiums/K6s is required. Otherwise, it's an ancient and creaky
fp architecture that would be best obsoleted (which they finally did in
x86_64 AFAIK.)
Brian
next prev parent reply other threads:[~2007-03-09 18:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <f7bda7fe0703090927s589149c3yeeaf992c3b6c26b5@mail.gmail.com>
2007-03-09 18:00 ` max
2007-03-09 18:33 ` Terry Frankcombe
2007-03-09 18:47 ` Brian Dessent
2007-03-09 18:55 ` Terry Frankcombe
2007-03-09 19:08 ` Brian Dessent [this message]
2007-03-09 19:27 ` Terry Frankcombe
2007-03-10 18:37 ` John (Eljay) Love-Jensen
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