This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] Make ieee754 fma tolerate architectures without exceptionsupport.


On 11/5/2012 1:16 PM, Joseph S. Myers wrote:
> On Mon, 5 Nov 2012, Chris Metcalf wrote:
>
>> +/* For IEEE754 architectures without exception support, tolerate imprecision
>> +   in __fma but allow using this implementation instead of the generic one.
> It really shouldn't be hard to adapt Bruno Haible's gnulib fma / fmaf / 
> fmal to replace the generic versions with something accurate if slow (bug 
> 13304) - but this does require approval to use the code under LGPLv2.1+ 
> (the glibc license).
>
> (I don't know if the gnulib version passes all the tests I've added to 
> glibc lately for various fma bugs I've fixed - there's still one left to 
> fix, bug 14793 - but any problems those tests show ought to be easy to 
> fix.)

Meanwhile, does my proposed change seem plausible?  It unbreaks the libm
build for tile, and the tests continue to report 0 or 1 ULP for all the fma
tests, much better than the generic fma.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]