From: "Kevin D. Kissell" <kevink@mips.com>
To: "Eric Christopher" <echristo@redhat.com>,
"Mark and Janice Juszczec" <juszczec@hotmail.com>
Cc: <linux-mips@linux-mips.org>
Subject: Re: r3000 instruction set
Date: Sun, 22 Feb 2004 22:52:13 +0100 [thread overview]
Message-ID: <001001c3f98e$2270dcc0$10eca8c0@grendel> (raw)
In-Reply-To: 1077477186.3636.34.camel@dzur.sfbay.redhat.com
> Other than the responses you've already gotten, likely you'll need to
> compile with -march=r3900(or -mcpu=r3900 if it's an old toolchain) since
> the 3900 is missing a couple of r3000 instructions iirc.
The 3900 family should run MIPS I code compiled for the R3000.
> If it's the 3912 I remember it also doesn't have an fpu, but I could be
> wrong there. If it is, then you need -msoft-float as well.
The 3912 has no FPU, but if you're running on any contemporary
MIPS/Linux kernel and library system, you neither need nor want
soft-float. The kernel does FP instruction emulation. Running soft-float
would make for faster, if larger, code, but requires that the whole
system, particularly glibc, be built for soft-float, which is rarely done
(and the last time I tried it, didin't quite work with the standard
glibc sources out-of-the-box).
WARNING: multiple messages have this Message-ID (diff)
From: "Kevin D. Kissell" <kevink@mips.com>
To: Eric Christopher <echristo@redhat.com>,
Mark and Janice Juszczec <juszczec@hotmail.com>
Cc: linux-mips@linux-mips.org
Subject: Re: r3000 instruction set
Date: Sun, 22 Feb 2004 22:52:13 +0100 [thread overview]
Message-ID: <001001c3f98e$2270dcc0$10eca8c0@grendel> (raw)
Message-ID: <20040222215213.g_SwR4f8AGRrPdO6LFwaeWnuccd0OK-Uagcv5OjojKE@z> (raw)
In-Reply-To: 1077477186.3636.34.camel@dzur.sfbay.redhat.com
> Other than the responses you've already gotten, likely you'll need to
> compile with -march=r3900(or -mcpu=r3900 if it's an old toolchain) since
> the 3900 is missing a couple of r3000 instructions iirc.
The 3900 family should run MIPS I code compiled for the R3000.
> If it's the 3912 I remember it also doesn't have an fpu, but I could be
> wrong there. If it is, then you need -msoft-float as well.
The 3912 has no FPU, but if you're running on any contemporary
MIPS/Linux kernel and library system, you neither need nor want
soft-float. The kernel does FP instruction emulation. Running soft-float
would make for faster, if larger, code, but requires that the whole
system, particularly glibc, be built for soft-float, which is rarely done
(and the last time I tried it, didin't quite work with the standard
glibc sources out-of-the-box).
next prev parent reply other threads:[~2004-02-22 21:50 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-22 3:02 r3000 instruction set Mark and Janice Juszczec
2004-02-22 3:15 ` Michael Uhler
2004-02-22 9:32 ` Kevin D. Kissell
2004-02-22 9:32 ` Kevin D. Kissell
2004-02-22 12:31 ` Dominic Sweetman
2004-02-22 19:13 ` Eric Christopher
2004-02-22 21:52 ` Kevin D. Kissell [this message]
2004-02-22 21:52 ` Kevin D. Kissell
2004-02-23 3:03 ` Steven J. Hill
2004-02-23 7:03 ` Kevin D. Kissell
2004-02-23 7:03 ` Kevin D. Kissell
2004-02-23 3:37 ` Eric Christopher
2004-02-23 7:11 ` Kevin D. Kissell
2004-02-23 7:11 ` Kevin D. Kissell
2004-02-23 7:29 ` Eric Christopher
-- strict thread matches above, loose matches on Subject: below --
2004-02-23 16:56 Mark and Janice Juszczec
2004-02-23 17:07 ` Michael Uhler
2004-02-23 17:13 ` Maciej W. Rozycki
2004-02-23 17:21 ` Kevin D. Kissell
2004-02-23 17:21 ` Kevin D. Kissell
2004-02-23 17:59 ` Dominic Sweetman
2004-02-23 20:48 Mark and Janice Juszczec
2004-02-23 22:46 ` Kevin D. Kissell
2004-02-23 22:46 ` Kevin D. Kissell
2004-03-01 15:38 Mark and Janice Juszczec
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