https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79002
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target|s390x |s390x x86_64-*-* Status|UNCONFIRMED |NEW Last reconfirmed| |2017-01-05 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed on x86_64. The difference is an added CLOBBER in the paren case which leads to try/finally which leads to the tail recursion not being detected and recursive inlining applying.