[Bug regression/86304] New: [9 regression][MIPS] FAIL: gcc.dg/vect/pr79887.c -mmsa (internal compiler error) starting with r261740

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86304

            Bug ID: 86304
           Summary: [9 regression][MIPS] FAIL: gcc.dg/vect/pr79887.c
                    -mmsa (internal compiler error) starting with r261740
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: paul.hua.gm at gmail dot com
  Target Milestone: ---

Created attachment 44318
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44318&action=edit
preprocessed .i file

/home/xuchenghua/GCC/test/gcc-r261994-3a_obj/gcc/cc1 -fpreprocessed pr79887.i
-mel -quiet -dumpbase pr79887.c -mmsa -march=mips64r2 -mabi=64 -mllsc -mips64r2
-mno-shared -auxbase-strip pr79887.s -O2 -version -fdiagnostics-color=never
-fno-diagnostics-show-caret -ftree-vectorize -fvect-cost-model=unlimited
-fno-common -fdump-tree-vect-details -fno-trapping-math -o pr79887.s --param
vect-epilogues-nomask=1
GNU C17 (gcc trunk r261994 mips64el o32 n32 n64) version 9.0.0 20180624
(experimental) (mips64el-linux-gnu)
        compiled by GNU C version 9.0.0 20180624 (experimental), GMP version
6.0.0, MPFR version 3.1.2, MPC version 1.0.2, isl version none
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C17 (gcc trunk r261994 mips64el o32 n32 n64) version 9.0.0 20180624
(experimental) (mips64el-linux-gnu)
        compiled by GNU C version 9.0.0 20180624 (experimental), GMP version
6.0.0, MPFR version 3.1.2, MPC version 1.0.2, isl version none
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 1af6f302eecac9296cae2767584f1008
during RTL pass: expand
/home/xuchenghua/GCC/gcc_git_trunk/gcc/testsuite/gcc.dg/vect/pr79887.c: In
function 'foo':
/home/xuchenghua/GCC/gcc_git_trunk/gcc/testsuite/gcc.dg/vect/pr79887.c:8:1:
internal compiler error: in expand_LOOP_VECTORIZED, at internal-fn.c:2430
0x12012172f expand_LOOP_VECTORIZED
        ../../../gcc_git_trunk/gcc/internal-fn.c:2430
0x1202d5537 expand_call_stmt
        ../../../gcc_git_trunk/gcc/cfgexpand.c:2596
0x1202d5537 expand_gimple_stmt_1
        ../../../gcc_git_trunk/gcc/cfgexpand.c:3575
0x1202d5537 expand_gimple_stmt
        ../../../gcc_git_trunk/gcc/cfgexpand.c:3734
0x1202d8327 expand_gimple_basic_block
        ../../../gcc_git_trunk/gcc/cfgexpand.c:5765
0x1202dda8f execute
        ../../../gcc_git_trunk/gcc/cfgexpand.c:6368
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

bisected show this bug starting with r261740.
preprocessed .i file are attached.