[PATCH] math: Remove fenvinline.h

[Paul E Murphy]

On 3/6/20 11:54 AM, Adhemerval Zanella wrote:
> Similar to string2.h (18b10de7ce) and string3.h (09a596cc2c) this
> patch removes the fenvinline.h on all architectures.  Currently
> only powerpc implements some optimization.

Is that entirely accurate?  x86 looks like it places similar inline 
optimizations into bits/fenv.h, i.e feraiseexcept.

Should these instead move into the equivalent ppc bits/fenv.h header?

> 
> As for the strings optimization, this kind of optimization is
> better implemented by the compiler (which handles the architecture
> ISA transparently).
> 
> Also, for the specific optimized powerpc implementation the code is
> becoming convoluted and these micro-optimization are hardly wildly
> used, even more being a possible hotspot in realword cases
> (non-default rounding are used only on specific cases and exception
> handling are done most likely only on errors path).  The fact
> that no other architecture bother to implement such optimization
> is also an indication that these should no be on libc.
> 
> The math/test-fenv already covers all math/test-fenvinline tests,
> so it is safe to remove it.