[Bug target/64600] New: arm-rtems ICE on valid code (-mcpu=xscale)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64600

            Bug ID: 64600
           Summary: arm-rtems ICE on valid code (-mcpu=xscale)
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org

$ arm-rtems4.11-gcc --version
arm-rtems4.11-gcc (GCC) 5.0.0 20150114 (experimental)

Last hash per git: commit d4cbe45aae70e38c12f3cd7430427c98289d7882

The fix for 64460 is in place.

Attached test case compiles at -Os but not -O1 or -O2. 
-O2 without -mcpu=xscale also works.

arm-rtems4.11-gcc --pipe -DHAVE_CONFIG_H   -I..
-I../../cpukit/../../../gumstix/lib/include   -mcpu=xscale -O2 -g -Wall
-Wmissing-prototypes -Wimplicit-function-declaration -Wstrict-prototypes
-Wnested-externs -MT src/libcsupport_a-cfgetospeed.o -MD -MP -MF
src/.deps/libcsupport_a-cfgetospeed.Tpo -c -o src/libcsupport_a-cfgetospeed.o
`test -f 'src/cfgetospeed.c' || echo
'../../../../../../rtems/c/src/../../cpukit/libcsupport/'`src/cfgetospeed.c
../../../../../../rtems/c/src/../../cpukit/libcsupport/src/cfgetospeed.c: In
function 'cfgetospeed':
../../../../../../rtems/c/src/../../cpukit/libcsupport/src/cfgetospeed.c:37:1:
internal compiler error: in decompose, at rtl.h:2005
 }
 ^
0x41c918 wi::int_traits<std::pair<rtx_def*, machine_mode> >::decompose(long*,
unsigned int, std::pair<rtx_def*, machine_mode> const&)
    ../../gcc/gcc/rtl.h:2005
0x91eae0 wi::int_traits<std::pair<rtx_def*, machine_mode> >::decompose(long*,
unsigned int, std::pair<rtx_def*, machine_mode> const&)
    ../../gcc/gcc/rtl.h:2005
0x91eae0 wide_int_ref_storage<false>::wide_int_ref_storage<std::pair<rtx_def*,
machine_mode> >(std::pair<rtx_def*, machine_mode> const&, unsigned int)
    ../../gcc/gcc/wide-int.h:957
0x91eae0 generic_wide_int<wide_int_ref_storage<false>
>::generic_wide_int<std::pair<rtx_def*, machine_mode> >(std::pair<rtx_def*,
machine_mode> const&, unsigned int)
    ../../gcc/gcc/wide-int.h:733
0x91eae0 wi::binary_traits<std::pair<rtx_def*, machine_mode>,
std::pair<rtx_def*, machine_mode>, wi::int_traits<std::pair<rtx_def*,
machine_mode> >::precision_type, wi::int_traits<std::pair<rtx_def*,
machine_mode> >::precision_type>::result_type wi::sub<std::pair<rtx_def*,
machine_mode>, std::pair<rtx_def*, machine_mode> >(std::pair<rtx_def*,
machine_mode> const&, std::pair<rtx_def*, machine_mode> const&)
    ../../gcc/gcc/wide-int.h:2357
0x91eae0 simplify_const_binary_operation(rtx_code, machine_mode, rtx_def*,
rtx_def*)
    ../../gcc/gcc/simplify-rtx.c:3867
0x91bf3f simplify_binary_operation(rtx_code, machine_mode, rtx_def*, rtx_def*)
    ../../gcc/gcc/simplify-rtx.c:1972
0x91fc77 simplify_associative_operation
    ../../gcc/gcc/simplify-rtx.c:1929
0x9188cc simplify_binary_operation_1
    ../../gcc/gcc/simplify-rtx.c:2967
0xdd4f21 combine_simplify_rtx
    ../../gcc/gcc/combine.c:5541
0xdd743b subst
    ../../gcc/gcc/combine.c:5374
0xdd70c8 subst
    ../../gcc/gcc/combine.c:5319
0xdd97ce try_combine
    ../../gcc/gcc/combine.c:3266
0xddef81 combine_instructions
    ../../gcc/gcc/combine.c:1312
0xddef81 rest_of_handle_combine
    ../../gcc/gcc/combine.c:14094
0xddef81 execute
    ../../gcc/gcc/combine.c:14137
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