[Bug target/101860] New: [12 Regression] ICE in gen_reg_rtx, at emit-rtl.c:1199 since r12-2837-g50b5877925ef5ae8

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101860

            Bug ID: 101860
           Summary: [12 Regression] ICE in gen_reg_rtx, at emit-rtl.c:1199
                    since r12-2837-g50b5877925ef5ae8
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu

The following fails:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/vshuf-v32hi.c
-O1 -mavx5124vnniw -c
during GIMPLE pass: fre
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/vshuf-v32hi.c: In
function ‘test_27’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/torture/vshuf-v32hi.c:12:
internal compiler error: in gen_reg_rtx, at emit-rtl.c:1199
0x69c2a8 gen_reg_rtx(machine_mode)
        /home/marxin/Programming/gcc/gcc/emit-rtl.c:1199
0xafb406 force_reg(machine_mode, rtx_def*)
        /home/marxin/Programming/gcc/gcc/explow.c:686
0xafb406 force_reg(machine_mode, rtx_def*)
        /home/marxin/Programming/gcc/gcc/explow.c:666
0x12fe673 ix86_expand_vec_one_operand_perm_avx512
        /home/marxin/Programming/gcc/gcc/config/i386/i386-expand.c:18124
0x12fe673 expand_vec_perm_1
        /home/marxin/Programming/gcc/gcc/config/i386/i386-expand.c:18302
0x12fe820 expand_vec_perm_1
        /home/marxin/Programming/gcc/gcc/config/i386/i386-expand.c:18311
0x13007e8 ix86_expand_vec_perm_const_1
        /home/marxin/Programming/gcc/gcc/config/i386/i386-expand.c:20702
0x1328bb2 ix86_vectorize_vec_perm_const(machine_mode, rtx_def*, rtx_def*,
rtx_def*, vec_perm_indices const&)
        /home/marxin/Programming/gcc/gcc/config/i386/i386-expand.c:21002
0x14db5ce gimple_simplify_VEC_PERM_EXPR
        /dev/shm/objdir/gcc/gimple-match.c:154152
0x13405c8 gimple_resimplify3
        /home/marxin/Programming/gcc/gcc/gimple-match-head.c:396
0x14dca97 gimple_simplify(gimple*, gimple_match_op*, gimple**, tree_node*
(*)(tree_node*), tree_node* (*)(tree_node*))
        /home/marxin/Programming/gcc/gcc/gimple-match-head.c:1002
0xbb0f10 gimple_fold_stmt_to_constant_1(gimple*, tree_node* (*)(tree_node*),
tree_node* (*)(tree_node*))
        /home/marxin/Programming/gcc/gcc/gimple-fold.c:7330
0x10a1ab5 try_to_simplify
        /home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:5428
0x10a1ab5 visit_stmt
        /home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:5471
0x10a2d86 process_bb
        /home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:7239
0x10a4642 do_rpo_vn
        /home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:7837
0x10a5e5a execute
        /home/marxin/Programming/gcc/gcc/tree-ssa-sccvn.c:7991
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