https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88308
--- Comment #5 from acsawdey at gcc dot gnu.org ---
After some more digging, it appears that the problem is
move_insn_for_shrink_wrap() is deleting and re-creating insns to move them from
one BB to another. The label reference count gets
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88308
--- Comment #4 from acsawdey at gcc dot gnu.org ---
Tracked down the difference between -m32 and -m64. In the -m64 case,
rs6000_emit_move calls force_const_mem and that will set LABEL_PRESERVE_P on a
label_ref that it finds, which is what marks
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88308
--- Comment #3 from acsawdey at gcc dot gnu.org ---
One difference between compiling this -m32 and -m64 is that the label for the
jump table is marked /s in the 64-bit version:
(code_label/s 22 21 23 4 (nil) [4 uses])
(jump_table_data 23 22 24
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88308
--- Comment #2 from Segher Boessenkool ---
This is related to PR88347.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88308
Segher Boessenkool changed:
What|Removed |Added
Target|powerpc-*-linux-gnu |powerpc*-*-*
