[Bug target/64460] ARM ICE on valid code

["joel at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64460

--- Comment #8 from Joel Sherrill <joel at gcc dot gnu.org> ---
(In reply to ktkachov from comment #7)
> I guess the testcase is flaky.
> I've posted the patch to fix the ICE and the reasoning behind it at
> https://gcc.gnu.org/ml/gcc-patches/2015-01/msg00686.html

Can you try again with the full test case? The head still fails for me at -O2
and -Os but not -O1. The location in toplev.c has moved down a few lines.

FWIW my original report had -mcpu=xscale but it fails with -mtune=xscale as
well. I 

$  ~/test-gcc/install-head/bin/arm-rtems4.11-gcc --version
arm-rtems4.11-gcc (GCC) 5.0.0 20150112 (experimental)

$  ~/test-gcc/install-head/bin/arm-rtems4.11-gcc -mtune=xscale -O2
/tmp/gumstix.c 
../../../../../../rtems/c/src/../../cpukit/score/src/objectextendinformation.c:
In function '_Objects_Extend_information':
../../../../../../rtems/c/src/../../cpukit/score/src/objectextendinformation.c:278:1:
internal compiler error: Segmentation fault
0x93b6ef crash_signal
    ../../gcc/gcc/toplev.c:372
0x8e4890 reg_overlap_mentioned_p(rtx_def const*, rtx_def const*)
    ../../gcc/gcc/rtlanal.c:1519
0xc0dd5c xscale_sched_adjust_cost
    ../../gcc/gcc/config/arm/arm.c:11534
0xc0d97b arm_adjust_cost
    ../../gcc/gcc/config/arm/arm.c:11984
0xe1979f dep_cost_1(_dep*, unsigned int)
    ../../gcc/gcc/haifa-sched.c:1513
0xe1af07 dep_cost(_dep*)
    ../../gcc/gcc/haifa-sched.c:1532
0xe1af07 priority
    ../../gcc/gcc/haifa-sched.c:1683
0xe1afff set_priorities(rtx_insn*, rtx_insn*)
    ../../gcc/gcc/haifa-sched.c:6796
0x8ecd2c compute_priorities()
    ../../gcc/gcc/sched-rgn.c:2940
0x8ef94d schedule_region
    ../../gcc/gcc/sched-rgn.c:3033
0x8ef94d schedule_insns()
    ../../gcc/gcc/sched-rgn.c:3431
0x8f0053 schedule_insns()
    ../../gcc/gcc/sched-rgn.c:3416
0x8f0053 rest_of_handle_sched
    ../../gcc/gcc/sched-rgn.c:3635
0x8f0053 execute
    ../../gcc/gcc/sched-rgn.c:3743
Please submit a full bug report,