[Bug target/64829] New: [ARM] ICE at -O3 in vect_get_vec_def_for_stmt_copy

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64829

            Bug ID: 64829
           Summary: [ARM] ICE at -O3 in vect_get_vec_def_for_stmt_copy
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org

Compiling the attached testcase at -O3 results in an ICE.

GCC is configured as:
--target=arm-none-linux-gnueabihf
--with-mode=arm --with-cpu=cortex-a9 --with-fpu=neon

Compiling at -O2 -Wall warns that several local variables are unintialized.
Initializing val1=0 makes the ICE disappear.

arm-none-linux-gnueabihf-gcc -Wall  gcc_vect_bug.c -c -O3
gcc_vect_bug.c: In function 'fail':
gcc_vect_bug.c:22:5: internal compiler error: in
vect_get_vec_def_for_stmt_copy, at tree-vect-stmts.c:1598
 int fail ( const RMColorData * pInColor,
     ^
0xfb2c34 vect_get_vec_def_for_stmt_copy(vect_def_type, tree_node*)
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vect-stmts.c:1598
0xfb2d3d vect_get_vec_defs_for_stmt_copy
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vect-stmts.c:1624
0xfbeac3 vectorizable_operation
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vect-stmts.c:4910
0xfc658d vect_transform_stmt(gimple_statement_base*, gimple_stmt_iterator*,
bool*, _slp_tree*, _slp_instance*)
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vect-stmts.c:7273
0xfdbcf3 vect_transform_loop(_loop_vec_info*)
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vect-loop.c:6156
0xff1deb vectorize_loops()
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-vectorizer.c:497
0xee638f execute
       
/media/lyon/9be1a707-5b7f-46da-9106-e084a5dbb011/ssd/src/GCC/sources/gcc-fsf/trunk/gcc/tree-ssa-loop.c:295