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Handling systems without exception or rounding mode support

On Sun, 13 May 2012, Chris Metcalf wrote:

> I'll have some further questions to ask about the ulps-generating stuff,
> though.  I hacked the examples to work around the missing exception
> #defines on tile to generate some plausible ulps data, but as things stand
> the presence of all the FE_xxx tests means the tests don't compile.

I'd say there are a few separate issues with support in glibc for systems 
without full exception or rounding mode support:

* Tests not compiling if the defines for rounding modes are not present.  
I'd say the relevant bits of the tests should have #ifdef conditions on 
the defines being present.  (They already do check that fesetround 
succeeded and only run the tests if it did.)

* Tests not compiling if defines for exceptions are not present.  I'm not 
aware of such issues with - as far as I can see the tests 
for exceptions are already properly conditional - but if any testcases 
have unconditioned uses of exceptions, much the same would apply.

* Functions in libm that only work with exception / rounding mode support.  
The only case I know of is fma.  Bruno, in bug 13304 you expressed a 
willingness to adapt the gnulib implementation of the fma functions to be 
suitable for use in glibc as the math/ implementation that can be used for 
systems without hardware exception / rounding mode support, and in 
<> I indicated I 
thought that was the way to go - any news there?

Joseph S. Myers

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