On Wed, Oct 21, 2020 at 09:03:03PM +0200, Martin Liška wrote: > Maybe a silly question, but isn't the code only an obfuscation? > What about doing: > > if (__builtin_constant_p(x)) > return x < 2 ? 0 : __builtin_clz(x); > > which is fully eliminated in a c.031t.ccp1 pass right after einline happens > for a call context where 'x' is a constant. > > Isn't the right place for fix in Linux kernel?
Of course it is, see https://lore.kernel.org/linux-toolchains/21556974-eea1-ed6a-ea6f-3e97a6eea...@csgroup.eu/T/#m12d2586fe18ed27789c8d67a677783a83b79efa8 Jakub
