https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92176
--- Comment #1 from Andreas Krebbel <krebbel at gcc dot gnu.org> --- Created attachment 47387 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47387&action=edit Another reduced testcase gcc -O3 -march=z13 t.c -o t ./t prints "checksum = 0" with head GCC prints "checksum = 5" with GCCs before r272639 but this patch only appears to reveal the actual issue