Fix for bz#13658 - using fsincos on x86-64

[Carlos O'Donell]

On Thu, Feb 9, 2012 at 4:49 PM, Andreas Jaeger <aj@suse.com> wrote:
> We should not use the inaccurate fsincos instruction on x86-64 (see bugzilla
> and the discussion on the gcc mailing list). Let's just remove the double
> version and use the IBM libm sincos implementation.
>
> Unfortunately the same fix does not work for the long double version - since
> there's no sincos implementation for ldbl-96 yet ;-(. Jakub, you wrote the
> ldb-128 versions - do you have any suggestions?
>
> Andreas
>
> 2012-02-09  Andreas Jaeger  <aj@suse.de>
>
>        [BZ#13658]
>        * sysdeps/x86_64/fpu/s_sincos.S: Remove, let's not use the
>        inaccurate fsincos instruction.

Is there any reason we don't do long-form argument reduction (as
normal sin and cos do) followed by fsincos?

Does this effect i386 which also uses fsincos?

Does this also effect m68k which uses fsincos (M68000PM/AD REV.1
states loss of accuracy if the input is > 10^20).

Cheers,
Carlos.