[Bug tree-optimization/28935] New: [4.2 regression] Segfault in operand_equal_p with -ftree-vectorize -O3

["tbm at cyrius dot com" <gcc-bugzilla at gcc dot gnu dot org>]

(gdb) run -ftree-vectorize -O3 orig.c
Starting program: /usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.2.0/cc1
-ftree-vectorize -O3 orig.c
 vprintf getchar getc_unlocked getchar_unlocked putchar fputc_unlocked
putc_unlocked putchar_unlocked feof_unlocked ferror_unlocked strtod strtol
strtoul strtoq strtouq strtoll strtoull atof atoi atol atoll gnu_dev_major
gnu_dev_minor gnu_dev_makedev __strcspn_c1 __strcspn_c2 __strcspn_c3
__strspn_c1 __strspn_c2 __strspn_c3 __strpbrk_c2 __strpbrk_c3 __strtok_r_1c
__strsep_1c __strsep_2c __strsep_3c tolower toupper default_params
game_fetch_preset free_params dup_params decode_params encode_params
game_configure custom_params validate_params cf_init cf_add cf_clookup
cf_slookup cf_whichsym extend_options genmap gengraph graph_edge_index
graph_vertex_start fourcolour_recurse fourcolour new_scratch free_scratch
bitcount place_colour map_solver new_game_desc parse_edge_list validate_desc
new_game dup_game free_game solve_game game_text_format new_ui free_ui
encode_ui decode_ui game_changed_state region_from_coords interpret_move
execute_move game_compute_size game_set_size game_colours game_new_drawstate
game_free_drawstate draw_error draw_square game_redraw game_anim_length
game_flash_length game_timing_state game_print_size game_print {GC 5409k ->
4262k}
Analyzing compilation unit {GC 5549k -> 5279k}Performing interprocedural
optimizations
Assembling functions:
 validate_params game_text_format encode_ui decode_ui game_changed_state
game_compute_size game_anim_length game_timing_state extend_options {GC 7012k
-> 5709k}
Program received signal SIGSEGV, Segmentation fault.
0x00000000005eb71c in operand_equal_p (arg0=0x2b9e8fa5e930, arg1=<value
optimized out>, flags=0)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:2536
2536            return (! TREE_CONSTANT_OVERFLOW (arg0)
(gdb) where
#0  0x00000000005eb71c in operand_equal_p (arg0=0x2b9e8fa5e930, arg1=<value
optimized out>, flags=0)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:2536
#1  0x000000000060d73a in operand_equal_for_comparison_p (arg0=0x2b9e8fa5e930,
arg1=0x2b9e8fa5e900,
    other=0x2b9e8fa5e930) at /home/tbm/scratch/gcc/gcc/fold-const.c:2763
#2  0x000000000060fbb4 in fold_cond_expr_with_comparison (type=0x2b9e8fa534d0,
arg0=0x2b9e8fefca50,
    arg1=<value optimized out>, arg2=<value optimized out>)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:4544
#3  0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
#4  0x00000000005efac1 in fold_build3_stat (code=2410015024,
type=0x2b9e8fa5e900, op0=0x0, op1=0x2,
    op2=0x16) at /home/tbm/scratch/gcc/gcc/fold-const.c:11693
#5  0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
#6  0x00000000005efac1 in fold_build3_stat (code=2410015024,
type=0x2b9e8fa5e900, op0=0x0, op1=0x2,
    op2=0x16) at /home/tbm/scratch/gcc/gcc/fold-const.c:11693
#7  0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
#8  0x00000000005efac1 in fold_build3_stat (code=2410015024,
type=0x2b9e8fa5e900, op0=0x0, op1=0x2,
    op2=0x16) at /home/tbm/scratch/gcc/gcc/fold-const.c:11693
#9  0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
#10 0x00000000005efac1 in fold_build3_stat (code=2410015024,
type=0x2b9e8fa5e900, op0=0x0, op1=0x2,
    op2=0x16) at /home/tbm/scratch/gcc/gcc/fold-const.c:11693
#11 0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
#12 0x00000000005efac1 in fold_build3_stat (code=2410015024,
type=0x2b9e8fa5e900, op0=0x0, op1=0x2,
    op2=0x16) at /home/tbm/scratch/gcc/gcc/fold-const.c:11693
#13 0x00000000005ef050 in fold_ternary (code=<value optimized out>,
type=0x2b9e8fa534d0,
    op0=<value optimized out>, op1=0x2b9e8fa5e930, op2=0x2b9e8fa5e900)
    at /home/tbm/scratch/gcc/gcc/fold-const.c:11121
...


-- 
           Summary: [4.2 regression] Segfault in  operand_equal_p with -
                    ftree-vectorize -O3
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tbm at cyrius dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28935