[Bug rtl-optimization/104778] New: [12 Regression] ICE in simplify_subreg, at simplify-rtx.cc:7324

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104778

            Bug ID: 104778
           Summary: [12 Regression] ICE in simplify_subreg, at
                    simplify-rtx.cc:7324
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu

Created attachment 52560
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52560&action=edit
Testcase

gcc 12.0.1 20220227 snapshot (g:d1574a9b820f17adb9004255e2018967e9be063b) ICEs
when compiling the attached testcase w/ -mcpu=a2 -Og -g:

% powerpc-e300c3-linux-gnu-gcc-12.0.1 -mcpu=a2 -Og -g -c poy2oawm.c
during RTL pass: vartrack
poy2oawm.c: In function 'foo':
poy2oawm.c:47:1: internal compiler error: in simplify_subreg, at
simplify-rtx.cc:7324
   47 | }
      | ^
0x6ad8e4 simplify_context::simplify_subreg(machine_mode, rtx_def*,
machine_mode, poly_int<1u, unsigned long>)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/simplify-rtx.cc:7324
0xe76f89 simplify_context::simplify_gen_subreg(machine_mode, rtx_def*,
machine_mode, poly_int<1u, unsigned long>)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/simplify-rtx.cc:7602
0x11c9e59 simplify_gen_subreg(machine_mode, rtx_def*, machine_mode,
poly_int<1u, unsigned long>)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/rtl.h:3534
0x11c9e59 vt_expand_loc_callback
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8524
0x9e432d cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1848
0x9e4269 cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1921
0x9e4269 cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1921
0x9e4269 cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1921
0x9e5b7e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1731
0x11c9a23 vt_expand_var_loc_chain
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8420
0x11ca01d vt_expand_loc_callback
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8583
0x9e4516 cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1883
0x9e5b7e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1731
0x11c9a23 vt_expand_var_loc_chain
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8420
0x11ca01d vt_expand_loc_callback
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8583
0x9e5b7e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1731
0x11c9e22 vt_expand_loc_callback
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8517
0x9e432d cselib_expand_value_rtx_1
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1848
0x9e5b7e cselib_expand_value_rtx_cb(rtx_def*, bitmap_head*, int, rtx_def*
(*)(rtx_def*, bitmap_head*, int, void*), void*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/cselib.cc:1731
0x11c9a23 vt_expand_var_loc_chain
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-12.0.1_p20220227/work/gcc-12-20220227/gcc/var-tracking.cc:8420