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Re: SoftFloat implementation for MIPS in GCC

To: Rajesh Palani <>
Subject: Re: SoftFloat implementation for MIPS in GCC
From: Daniel Jacobowitz <>
Date: Wed, 28 Jan 2004 14:33:55 -0500
In-reply-to: <>
Original-recipient: rfc822;
References: <>
User-agent: Mutt/1.5.1i
On Wed, Jan 28, 2004 at 11:26:36AM -0800, Rajesh Palani wrote:
> Hi,
>    We are using a gcc 2.96 20000731 (Red Hat Linux 7.1 2.96-99.1) GCC 
> cross-compiler with -msoftfloat to use software floating point routines.
>    When we profied an application using the Linux Trace Toolkit, we observed 
> that  there were a lot of CpU (Co-processor unusable) exceptions.  Some of 
> the floating point routines ( eg. __floatdidf) expect values to be passed in 
> floating point registers and take FP exceptions even though the application 
> has been built with -msoftfloat.  Is this a general MIPS/GCC issue?  What is 
> the status of softfloat  for MIPS in GCC?

Try a more recent compiler, that one is ancient.  If you configure
correctly, you should get no references to the floating point registers
at all.

Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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