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

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