LLVM asm with constraints, and 2 operands

[kinke]

On Monday, 19 July 2021 at 17:20:21 UTC, kinke wrote:
> Compiling with `-O -mtriple=i686-linux-gnu -mcpu=i686` (=> no 
> SSE2 by default) shows that the inlined version inside 
> `wrapper()` is the mega slow one, so the extra instructions 
> aren't applied transitively unfortunately.

Erm sorry should have looked more closely - it's not inlined, and 
the call seems extremely expensive too, with state pushing and 
popping going on, apparently to account for the different 
targets. Brrr, to be avoided at all costs for such tiny 
functions. :)