https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69716
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED CC| |jakub at gcc dot gnu.org Resolution|--- |INVALID --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- That is user error, r is not the right constraint for 8-bit values in ia32 code, you need to use q instead.