https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64671
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 34486 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34486&action=edit tsf.ii.bz2 Preprocessed tree-ssa-forwprop.c. To reproduce with x86_64-linux -> s390x-linux cross: ./cc1plus -m31 -O2 -fexceptions -fstack-protector-strong -march=z9-109 \ -mtune=z10 -fprofile-generate -fno-exceptions -fno-rtti \ -fasynchronous-unwind-tables tsf.ii -o tsf.s -nostdinc Look for 3rd line with brasl %r14,_ZN3vecIP9tree_node7va_heap6vl_ptrE7reserveEjb and a few lines above it is that: .L2667: .loc 3 1448 0 lr %r1,%r8 ahi %r1,-1 lhi %r4,1 lr %r10,%r1 jne .L2667