[Bug rtl-optimization/84844] New: [8 Regression] ICE in extract_constrain_insn_cached, at recog.c:2217 (error: insn does not satisfy its constraints)

["asolokha at gmx dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84844

            Bug ID: 84844
           Summary: [8 Regression] ICE in extract_constrain_insn_cached,
                    at recog.c:2217 (error: insn does not satisfy its
                    constraints)
           Product: gcc
           Version: 8.0
            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: x86_64-pc-linux-gnu-gcc

gcc-8.0.0-alpha20180311 snapshot (r258438) ICEs when compiling the following
snippet w/ -march=bdver1 (=bdver2) -O1 (-O2, -O3, -Ofast, -Og, -Os)
-fschedule-insns -fselective-scheduling:

double
vl (int *hm, int ue, int jy)
{
  *hm = ue;
  return jy;
}

% x86_64-pc-linux-gnu-gcc-8.0.0-alpha20180311 -march=bdver1 -O1
-fschedule-insns -fselective-scheduling -c iy3oz1yv.c
iy3oz1yv.c: In function 'vl':
iy3oz1yv.c:6:1: error: insn does not satisfy its constraints:
 }
 ^
(insn 19 0 0 (set (reg:DF 91)
        (float:DF (reg:SI 1 dx [ jy ]))) 205 {*floatsidf2_mixed}
     (expr_list:REG_DEAD (reg/v:SI 90 [ jy ])
        (nil)))
during RTL pass: sched1
iy3oz1yv.c:6:1: internal compiler error: in extract_constrain_insn_cached, at
recog.c:2217
0x64a621 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/rtl-error.c:108
0x64a647 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/rtl-error.c:118
0x648bc4 extract_constrain_insn_cached(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/recog.c:2217
0x118653d get_attr_type(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/config/i386/i386.md:2241
0x11b6f86 internal_dfa_insn_code_bdver1(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/config/i386/i386.md:15271
0x11a29a8 dfa_insn_code
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/build/gcc/insn-automata.c:150079
0x11a29a8 state_transition(void*, rtx_def*)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/build/gcc/insn-automata.c:150094
0xc5f1fd estimate_insn_cost
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4291
0xc6b0ab get_expr_cost
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4322
0xc6b0ab choose_best_insn
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4351
0xc6b0ab find_best_expr
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:4401
0xc6b0ab fill_insns
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:5544
0xc6b0ab schedule_on_fences
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7361
0xc6b0ab sel_sched_region_2
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7499
0xc6d227 sel_sched_region_1
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7541
0xc6d227 sel_sched_region(int)
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7642
0xc6e288 run_selective_scheduling()
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sel-sched.c:7718
0xc4ddfd rest_of_handle_sched
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3715
0xc4ddfd execute
       
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180311/work/gcc-8-20180311/gcc/sched-rgn.c:3825