From: Wolfgang Denk <wd@denx.de>
To: Conn Clark <clark@esteem.com>
Cc: May Ling List <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: MPC8xx fpu support and compiling glib.
Date: Fri, 12 Apr 2002 15:37:09 +0200 [thread overview]
Message-ID: <20020412133714.1AD7C11258@denx.denx.de> (raw)
In-Reply-To: Your message of "Thu, 11 Apr 2002 15:28:35 PDT." <3CB60E13.BA0A4A6@esteem.com>
In message <3CB60E13.BA0A4A6@esteem.com> you wrote:
>
> I was wondering a few things about MPC8xx FPU support. If
> I build a kernel with fpu-emulation do I have to pass the CFLAGS
That makes only sense when your application AND libraies DO NOT use
soft-float.
> "-msoft-float -D_SOFT_FLOAT" when compiling glibc? Does it save me
You cannot mix FPU-code and soft-float in one application/library
setup.
> any ram if I don't? I know if I don't my performance will drop but
> our aplication doesn't use floating point except for ping mabey.
Ummm... why should soft-float result in _smaller_ code? On contrary -
the code will be bigger, but run faster since you don;t have to trap
into the kernel for each FP instruction.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
To know how another being, another creature feels - that is impos-
sible. - Terry Pratchett, _The Dark Side of the Sun_
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-04-12 13:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-11 22:28 MPC8xx fpu support and compiling glib Conn Clark
2002-04-12 13:37 ` Wolfgang Denk [this message]
[not found] <3CB71524.46DC9F87@esteem.com>
2002-04-12 19:47 ` Wolfgang Denk
2002-04-12 20:11 ` Dr. Craig Hollabaugh
2002-04-12 20:41 ` Wolfgang Denk
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