[Bug 1001539] Single precision floating point math library

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--- Comment #21 from Ilija Kocho <ilijak@siva.com.mk> 2012-03-22 23:52:49 GMT ---
(In reply to comment #20)
> (In reply to comment #19)
> > > Tests expect NaN for out-of-domain arguments, but functions return
> > > something else. For instance asinf(10) returns 0. Here is a little
> > > example:
> > 
> > IMO, it can depend on libm compatibility, look at libm compat.
> > wrappers (w_*.c), e.g.  at w_asin{,f}.c. Though, I think in our case
> > it should be a result of call __ieee754_asin{,f}().  And if libm
> > compat mode is not IEEE?  I'm looking at misc/standard.c
> > (__kernel_standard)...
> 
> Well, I understand what is wrong. Let's take `wf_asin.c', "i wonder"
> hack:
> 
>   --- a/packages/language/c/libm/current/src/float/ieee754-api/wf_asin.c
>   +++ b/packages/language/c/libm/current/src/float/ieee754-api/wf_asin.c
>   @@ -88,8 +88,10 @@
>    #ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
>        return __ieee754_asinf(x);
>    #else
>   -    double z;
>   +    float z;
>        z = __ieee754_asinf(x);
>   +    printf("__ieee754_asinf(%f)=%f\n", x, z);
>   +    return z;
>        if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE || isnanf(x))
> 

[snip]

> FYI, import
> 
>   cdl_option CYGSEM_LIBM_COMPAT_IEEE_ONLY {
>       user_value 1
>   };
> 
> breaks build of single precision tests. Some your headers have EDOM
> used, but this value is not defined for such config conditions. Perhaps,
> you need weak definition for that in `vector_support_float.h' header.
> 
>    // Not tested
>    #ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
>    # ifndef EDOM
>    #  define EDOM 33
>    # endif
>    #endif
> 
> Sergei

Thank you for bringing this up Sergei.
Now I am considering exclusion of EDOM cases from test
for modes other than CYGSEM_LIBM_COMPAT_IEEE_ONLY. (tests/asin.h doesn't have
them at all).

Ilija

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