[Bug target/59874] Missing builtin (__builtin_clzs) when compiling with g++

[linux at carewolf dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59874

Allan Jensen <linux at carewolf dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |linux at carewolf dot com

--- Comment #5 from Allan Jensen <linux at carewolf dot com> ---
This is more problematic to fix in Qt itself. How can we determine if we
should/can use __builtin_clzs or __lzcnt16?

Note the former is practically standard being supported by both older gcc and
clang. There is also the problem that we need to call a builtin, because the
C-intrinsics don't work as constexpr.