https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113229
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to avieira from comment #6) > Oh forgot to mention, this is triggering because of the div optimization in: > https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git; > h=c69db3ef7f7d82a50f46038aa5457b7c8cc2d643 > > But I suspect that too is just an enabler and not the root cause? Unless we > aren't supposed to use subregs for sve modes... Note there is another paths which lead to crashing in paradoxical_subreg_p still via simplify_const_vector_subreg (but not with the gen_divv4si3 in the trace) in a different testcase; testsuite/gcc.dg/pr69896.c . ``` /home/apinski/src/upstream-full-cross/gcc/gcc/testsuite/gcc.dg/pr69896.c:22:1: internal compiler error: in paradoxical_subreg_p, at rtl.h:3213 0x80c65b paradoxical_subreg_p(machine_mode, machine_mode) ../../gcc/rtl.h:3213 0x80cfc8 paradoxical_subreg_p(machine_mode, machine_mode) ../../gcc/poly-int.h:2179 0x80cfc8 simplify_const_vector_subreg ../../gcc/simplify-rtx.cc:7423 0x80cfc8 simplify_context::simplify_subreg(machine_mode, rtx_def*, machine_mode, poly_int<2u, unsigned long>) ../../gcc/simplify-rtx.cc:7595 0xfae1c9 insn_propagation::apply_to_rvalue_1(rtx_def**) ../../gcc/recog.cc:1176 0xfadcab insn_propagation::apply_to_rvalue_1(rtx_def**) ../../gcc/recog.cc:1117 0xfade93 insn_propagation::apply_to_rvalue_1(rtx_def**) ../../gcc/recog.cc:1254 0xfae63f insn_propagation::apply_to_pattern(rtx_def**) ../../gcc/recog.cc:1396 0x1cfdb66 try_fwprop_subst_pattern ../../gcc/fwprop.cc:440 0x1cfdb66 try_fwprop_subst ../../gcc/fwprop.cc:613 0x1cfe500 forward_propagate_and_simplify ../../gcc/fwprop.cc:809 0x1cfe500 forward_propagate_into ../../gcc/fwprop.cc:872 0x1cfe89d forward_propagate_into ../../gcc/fwprop.cc:821 0x1cfe89d fwprop_insn ../../gcc/fwprop.cc:929 0x1cfe9c1 fwprop ../../gcc/fwprop.cc:981 ```
