Thread (4 messages) 4 messages, 4 authors, 1999-02-15

Re: Why is -msoft-float used in Kernel compilation?

From: Troy Benjegerdes <hidden>
Date: 1999-02-15 06:41:24

On Sun, 14 Feb 1999, Michel Lanners wrote:
On  13 Feb, this message from Gavriel State echoed through cyberspace:
quoted
I can understand using -msoft-float if CONFIG__8xx is on,
but why use it when compiling for 60x or 7x0 CPUs?
I've heard something about a 'no floiting point in kernel' rule, and
I've tried compiling without -msoft-float.... it does boot, but it's an
ugly sight... fp warning messages all over!

I have, however, never seen a clear explanation of why that rule
exists...
I'm not sure, but I believe it's an optimization to allow the kernel to
not have to save floating point registers on every context switch.

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