[PATCH][X86] __builtin_ctz/clz sometimed defined for zero input

[Joerg Sonnenberger]

On Mon, Oct 27, 2014 at 11:05:43PM +0000, Robinson, Paul wrote:
> New patch attached that defines new builtins and uses them in
> lzcntintrin.h.

Wouldn't the point of the new builtins to *require* the 0 case to be
defined?

Joerg