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[Bug target/55904] New: g++.dg/torture/vshuf-v8hi.C fails on MIPS with -O3 -mel -mips16


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55904

             Bug #: 55904
           Summary: g++.dg/torture/vshuf-v8hi.C fails on MIPS with -O3
                    -mel -mips16
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sje@gcc.gnu.org


Created attachment 29102
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29102
preprocessed test case

The test g++.dg/torture/vshuf-v8hi.C fails with an ICE when compiled with
-O3 -mel -mips16.  (All  three options are required.)  I see this with the
mips-mti-elf and mips-mti-linux-gnu targets and believe it can be reproduced
with any MIPS target that can generate little-endian MIPS16 code.

I am attaching a preprocessed version of vshuf-v8hi.C.


% obj-mips-mti-linux-gnu/gcc/final/gcc/cc1plus -quiet -mel -O3 -mips16
-std=c++11 x.i

x.i: In function 'int main()':
x.i:67:1: internal compiler error: in change_address_1, at emit-rtl.c:2002
 }
 ^
0x82eef8 change_address_1
    /local/home/sellcey/nightly/src/gcc/gcc/emit-rtl.c:2002
0x82f5fb adjust_address_1(rtx_def*, machine_mode, long, int, int, int, long)
    /local/home/sellcey/nightly/src/gcc/gcc/emit-rtl.c:2134
0xa4df5e gen_lowpart_general(machine_mode, rtx_def*)
    /local/home/sellcey/nightly/src/gcc/gcc/rtlhooks.c:79
0xd3f60e output_154
    /local/home/sellcey/nightly/src/gcc/gcc/config/mips/mips.md:2912
0x87178e final_scan_insn(rtx_def*, _IO_FILE*, int, int, int*)
    /local/home/sellcey/nightly/src/gcc/gcc/final.c:2792
0x87232f final(rtx_def*, _IO_FILE*, int)
    /local/home/sellcey/nightly/src/gcc/gcc/final.c:1908
0x872559 rest_of_handle_final
    /local/home/sellcey/nightly/src/gcc/gcc/final.c:4271


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