Hi! On Wed, Sep 29, 2021 at 02:28:37PM +0200, Florian Weimer wrote: > If you need a specific instruction emitted, you need a compiler > intrinsic or inline assembly. Not an intrinsic. Builtins (like almost all other code) do not say "generate this particular machine code", they say "generate code that does <this>". That is one reason why builtins are more powerful than inline assembler (another related reason is that they tell the compiler exactly what behaviour is expected). > I don't think it's possible to piggy-back this on something else. Unless we get a description of what this does in term of language semantics (instead of generated machine code), there is no hope, even. Segher
