[Bug target/69012] New: gcc-6.0.0 internal compiler error building libgfortran for mips64el target

["paul.hua.gm at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69012

            Bug ID: 69012
           Summary: gcc-6.0.0 internal compiler error building libgfortran
                    for mips64el target
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: paul.hua.gm at gmail dot com
  Target Milestone: ---

I compiled the gcc version trunk@231140  under platform mips64el. The flowning
error occurred.

../../../../gcc-653b0b0/libgfortran/generated/maxval_r4.c: In function
âmaxval_r4â:
../../../../gcc-653b0b0/libgfortran/generated/maxval_r4.c:200:1: error:
unrecognizable insn:
 }
 ^

(insn 706 705 708 2 (parallel [
            (set (mem/c:SI (plus:SI (reg/f:SI 29 $sp)
                        (const_int 16 [0x10])) [11  S4 A32])
                (unspec:SI [
                        (const_int 16 [0x10])
                        (reg:SI 28 $28)
                    ] UNSPEC_POTENTIAL_CPRESTORE))
            (clobber (scratch:SI))   
        ]) ../../../../gcc-653b0b0/libgfortran/generated/maxval_r4.c:42 -1
     (expr_list:REG_DEAD (reg:SI 28 $28)
        (nil)))
../../../../gcc-653b0b0/libgfortran/generated/maxval_r4.c:200:1: internal
compiler error: in get_attr_got, at config/mips/mips.md:694
0x1205cf5bf _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-653b0b0/gcc/rtl-error.c:108
0x1205cf61f _fatal_insn_not_found(rtx_def const*, char const*, int, char
const*)
        ../../gcc-653b0b0/gcc/rtl-error.c:116
0x1209f062b get_attr_got(rtx_insn*)
        ../../gcc-653b0b0/gcc/config/mips/mips.md:694
0x120925bbf mips_insn_has_flexible_gp_ref_p
        ../../gcc-653b0b0/gcc/config/mips/mips.c:9927
0x120913813 mips_find_gp_ref
        ../../gcc-653b0b0/gcc/config/mips/mips.c:9858
0x120923c5f mips_global_pointer
        ../../gcc-653b0b0/gcc/config/mips/mips.c:9979
0x120923c5f mips_compute_frame_info  
        ../../gcc-653b0b0/gcc/config/mips/mips.c:10350
0x1209322c7 mips_initial_elimination_offset(int, int)
        ../../gcc-653b0b0/gcc/config/mips/mips.c:10591
0x1205d156b get_initial_register_offset
        ../../gcc-653b0b0/gcc/rtlanal.c:383
0x1205d1a2b rtx_addr_can_trap_p_1
        ../../gcc-653b0b0/gcc/rtlanal.c:618
0x1205d18bb rtx_addr_can_trap_p_1
        ../../gcc-653b0b0/gcc/rtlanal.c:679
0x1205d72cf may_trap_p_1(rtx_def const*, unsigned int)
        ../../gcc-653b0b0/gcc/rtlanal.c:2819
0x1202a1c47 can_move_insns_across(rtx_insn*, rtx_insn*, rtx_insn*, rtx_insn*,
basic_block_def*, bitmap_head*, bitmap_head*, rtx_insn**)
        ../../gcc-653b0b0/gcc/df-problems.c:4156
0x120b25bab dead_or_predicable
        ../../gcc-653b0b0/gcc/ifcvt.c:5099
0x120b2aca7 find_if_case_1
        ../../gcc-653b0b0/gcc/ifcvt.c:4791
0x120b2aca7 find_if_header
        ../../gcc-653b0b0/gcc/ifcvt.c:4194
0x120b2aca7 if_convert
        ../../gcc-653b0b0/gcc/ifcvt.c:5325
0x120b2bcbf execute
        ../../gcc-653b0b0/gcc/ifcvt.c:5515
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://bugs.loongnix.org/> for instructions.

The trunk@231896 occurred as same.

The cmd are :
/home/xuchenghua/GCC/gcc_git_trunk_231896_obj/./gcc/xgcc
-B/home/xuchenghua/GCC/gcc_git_trunk_231896_obj/./gcc/
-B/home/xuchenghua/toolchain/gcc-trunk-231896/mips6
4el-redhat-linux/bin/
-B/home/xuchenghua/toolchain/gcc-trunk-231896/mips64el-redhat-linux/lib/
-isystem
/home/xuchenghua/toolchain/gcc-trunk-231896/mips64el-redhat-linux/include
-isystem /home/xuc
henghua/toolchain/gcc-trunk-231896/mips64el-redhat-linux/sys-include -mabi=32
-DHAVE_CONFIG_H -I. -I../../../../gcc_git_trunk/libgfortran
-iquote../../../../gcc_git_trunk/libgfortran/io -I../../..
/../gcc_git_trunk/libgfortran/../gcc
-I../../../../gcc_git_trunk/libgfortran/../gcc/config -I../../.././gcc
-I../../../../gcc_git_trunk/libgfortran/../libgcc -I../../libgcc
-I../../../../gcc_git_t
runk/libgfortran/../libbacktrace -I../../libbacktrace -I../libbacktrace
-std=gnu11 -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Wextra -Wwrite-strings -Werror=implicit-fu
nction-declaration -Werror=vla -fcx-fortran-rules -ffunction-sections
-fdata-sections -std=gnu11 -g -O2 -minterlink-mips16 -Wunknown-pragmas -MT
maxval_r4.lo -MD -MP -MF .deps/maxval_r4.Tpo -c ../
../../../gcc_git_trunk/libgfortran/generated/maxval_r4.c -o maxval_r4.o

Configured with:
  $ ../gcc_git_trunk/configure
--prefix=/home/xuchenghua/toolchain/gcc-trunk-231896 --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--enable-multilib--with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --enable-languages=c,c++,objc,obj-c++,fortran,go,lto
--enable-plugin --enable-initfini-array --disable-libgcj --with-arch=mips64r2
--with-abi=64 --with-multilib-list=32,n32,64 --enable-gnu-indirect-function
--with-long-double-128 --build=mips64el-redhat-linux --with-pkgversion=gcc
20151222 commit: gcc-trunk-231896