[PATCH] powerpc: Fix feraiseexcept and feclearexcept macros

[Tulio Magno Quites Machado Filho]

Matheus Castanho <msc@linux.ibm.com> writes:

> A recent change to fenvinline.h modified the check if __e is a
> a power of 2 inside feraiseexcept and feclearexcept macros.  It
> introduced the use of the powerof2 macro but also removed the
> if statement checking whether __e != 0 before issuing an mtfsb*
> instruction.  This is problematic because powerof2 (0) evaluates
> to 1 and without the removed if __e is allowed to be 0 when
> __builtin_clz is called.  In that case the value 32 is passed
> to __MTFSB*, which is invalid.
>
> This commit uses __builtin_popcount instead of powerof2 to fix this
> issue and avoid the extra check for __e != 0.  This was the approach
> used by the initial versions of that previous patch.

Pushed as 1c252f0e7e5d78695f19450aa7c470bab445aa8e.

Thanks!

-- 
Tulio Magno