[Bug target/66541] New: r224314 causes ICE in gcc.dg/torture/pr52429.c

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66541

            Bug ID: 66541
           Summary: r224314 causes ICE in gcc.dg/torture/pr52429.c
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jgreenhalgh at gcc dot gnu.org
                CC: christian.bruel at st dot com
  Target Milestone: ---
            Target: arm-none-linux-gnueabihf

Created attachment 35781
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35781&action=edit
Reduced testcase

Looks closely related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64047

Reduced testcase attached, but the one in the testsuite is just as good.

.../gcc/cc1 besttry.c -O2  -ftree-parallelize-loops=4  -O2 -flto 
-fno-use-linker-plugin  -ftree-parallelize-loops=4 -o pr52429.s

 foo
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>
<free-inline-summary> <whole-program> <profile_estimate> <icf> <devirt> <cp>
<inline> <pure-const> <static-var> <single-use> <comdats>Assembling functions:
 foo
.../gcc/testsuite/gcc.dg/torture/pr52429.c: In function ‘foo’:
.../gcc/testsuite/gcc.dg/torture/pr52429.c:11:1: internal compiler error:
Segmentation fault
   int i;
 ^
0xafa15f crash_signal
        .../gcc/toplev.c:369
0x97c2b4 record_operand_costs
        .../gcc/ira-costs.c:1305
0x97c7a4 scan_one_insn
        .../gcc/ira-costs.c:1483
0x97c7a4 process_bb_for_costs
        .../gcc/ira-costs.c:1604
0x97d715 find_costs_and_classes
        .../gcc/ira-costs.c:1711
0x97ec3a ira_set_pseudo_classes(bool, _IO_FILE*)
        .../gcc/ira-costs.c:2245
0xffd743 alloc_global_sched_pressure_data
        .../gcc/haifa-sched.c:7119
0xffd743 sched_init()
        .../gcc/haifa-sched.c:7269
0xffebcf haifa_sched_init()
        .../gcc/haifa-sched.c:7281
0xaab8dc schedule_insns
        .../gcc/sched-rgn.c:3411
0xaac0b3 schedule_insns
        .../gcc/sched-rgn.c:3405
0xaac0b3 rest_of_handle_sched
        .../gcc/sched-rgn.c:3624
0xaac0b3 execute
        .../gcc/sched-rgn.c:3732
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