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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109636] [14 Regression] ICE: in paradoxical_subreg_p, at
 rtl.h:3205 with -O -march=armv8.4-a+sve
Date: Wed, 10 Jan 2024 08:05:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109636

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #9)
> The following testcases now fail due to this ICE when compiled with
> -march=3Darmv9-a+sve2 (something which I have been testing recently too):
> gcc.dg/torture/pr70083.c
> gcc.dg/pr69896.c
> gcc.target/aarch64/pr70120-1.c

Note gcc.dg/pr69896.c has a different path (not via gen_*divv*) to the ICE
though:
```

/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
```=