[PATCH] Fix remainder calculating bug in single floating point division

Kumar Gala galak at kernel.crashing.org
Tue Jan 8 17:20:08 EST 2008

On Jan 6, 2008, at 2:44 PM, Dan Malek wrote:

> On Jan 6, 2008, at 12:07 PM, Benjamin Herrenschmidt wrote:
>> It's nice to see somebody digging in that scary math emu stuff. If  
>> you
>> could also get rid of the warnings, it would be perfect :-)
> Yes, it is :-)  I didn't think it would have a life beyond MPC8xx.
>> .... that this code was lifted from
>> somewhere else (glibc ? gcc soft-float ?),
> It seems like a lifetime ago....  I copied the framework
> from Sparc, and the internals from gcc soft-float.  I didn't
> change any of the internal emulation functions (hence,
> some of the warnings), just the calling interface.
> While it's convenient, I still don't think kernel float
> emulation should be a solution.  The tools should
> generate soft-float for the applications and libraries.

If we think this is really true, we could move to using include/math- 
emu/* instead of the files in powerpc/math-emu.

The problem I had was when I tried to recreate the history of the code  
in powerpc/math-emu and how it doesn't really match the glibc code  
base.  There are some differences and I wasn't sure if they were do to  
trying to match PPC HW at a bit level or not.

I was hoping that the work Liu Yu would get as a bit of a testsuite to  
see if there was any harm in moving over to include/math-emu.

- k

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