------- Comment #2 from jakub at gcc dot gnu dot org 2008-09-11 08:19 -------
vect_analyze_slp_instance/vect_supported_load_permutation_p/vect_supported_slp_permutation_p
are buggy.
0x0000000000a51e93 in vect_supported_slp_permutation_p
(instance=0x7fffe4bfafd8) at ../../gcc/tree-vect-analyze.c:3157
3157 tmp_loads[index] = load;
(gdb) p *instance
$23 = {root = 0x7fffe4d95fd0, group_size = 2, unrolling_factor = 8, cost =
{outside_of_loop = 0, inside_of_loop = 33},
load_permutation = 0x7fffe512cfb8, loads = 0x7fffe512efb8}
(gdb) p *instance->load_permutation
$24 = {base = {num = 12, alloc = 16, vec = {5}}}
(gdb) x/12w instance->load_permutation->base.vec
0x7fffe512cfc0: 0x00000005 0x00000005 0x00000002 0x00000002
0x7fffe512cfd0: 0x00000004 0x00000004 0x00000001 0x00000001
0x7fffe512cfe0: 0x00000003 0x00000003 0x00000000 0x00000000
(gdb) p index
$25 = 5
So it is writing well past the end of tmp_loads (which has group_size == 2
entries).
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |irar at gcc dot gnu dot org
AssignedTo|jakub at gcc dot gnu dot org|unassigned at gcc dot gnu
| |dot org
Status|ASSIGNED |NEW
Last reconfirmed|2008-09-11 07:42:26 |2008-09-11 08:19:46
date| |
Target Milestone|4.4.0 |---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37474
