[Bug testsuite/80416] FAIL: g++.dg/torture/pr79671.C -O2 execution test

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80416

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
or better

  asm volatile ("" : "=r" (q) : "0" (q));