On Thu, Jun 09, 2016 at 06:43:04PM +0200, Jakub Jelinek wrote: > Yes, I'm all in favor in disabling X constraint for inline asm. > Especially if people actually try to print it as well, rather than make it > unused. That is a sure path to ICEs.
Though, on the other side, even our documentation mentions
asm volatile ("mtfsf 255,%1" : "=X"(sum): "f"(fpenv));
So perhaps we need to error just in case such an argument is printed?
Jakub
