------- Comment #6 from fxcoudert at gcc dot gnu dot org 2009-12-29 17:42
-------
I can confirm the segfault at -O3 with current trunk (rev. 155505) on
x86_64-apple-darwin10.2.0. I also generated a (much) reduced testcase:
void K (int *gpwgts, int *badminpwgt, int *badmaxpwgt)
{
int i;
for (i = 0; i < 10; i += 2) {
badminpwgt[i] = badminpwgt[i+1] = gpwgts[i]+gpwgts[i];
badmaxpwgt[i] = badmaxpwgt[i+1] = gpwgts[i]+gpwgts[i];
}
}
The segfault backtrace is:
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x0000000000000000
vect_analyze_slp (loop_vinfo=<value temporarily unavailable, due to
optimizations>, bb_vinfo=<value temporarily unavailable, due to optimizations>)
at gimple.h:33
33 DEF_VEC_P(gimple);
(gdb) bt
#0 vect_analyze_slp (loop_vinfo=<value temporarily unavailable, due to
optimizations>, bb_vinfo=<value temporarily unavailable, due to optimizations>)
at gimple.h:33
#1 0x00000001007bce67 in vect_analyze_loop (loop=<value temporarily
unavailable, due to optimizations>) at ../../trunk/gcc/tree-vect-loop.c:1433
#2 0x00000001007ca08a in vectorize_loops () at
../../trunk/gcc/tree-vectorizer.c:219
#3 0x000000010058d7ae in execute_one_pass (pass=0x100c3ca00) at
../../trunk/gcc/passes.c:1561
#4 0x000000010058da7d in execute_pass_list (pass=0x100c3ca00) at
../../trunk/gcc/passes.c:1616
#5 0x000000010058da8f in execute_pass_list (pass=0x100c3c820) at
../../trunk/gcc/passes.c:1617
#6 0x000000010058da8f in execute_pass_list (pass=0x100c3be60) at
../../trunk/gcc/passes.c:1617
#7 0x00000001006b86e8 in tree_rest_of_compilation (fndecl=0x141609900) at
../../trunk/gcc/tree-optimize.c:413
#8 0x00000001008731e3 in cgraph_expand_function (node=<value temporarily
unavailable, due to optimizations>) at ../../trunk/gcc/cgraphunit.c:1544
#9 0x00000001008760da in cgraph_optimize () at
../../trunk/gcc/cgraphunit.c:1623
#10 0x00000001008766bd in cgraph_finalize_compilation_unit () at
../../trunk/gcc/cgraphunit.c:1093
#11 0x000000010001f2a2 in c_write_global_declarations () at
../../trunk/gcc/c-decl.c:9490
#12 0x000000010064e322 in toplev_main (argc=4, argv=0x7fff5fbff5d0) at
../../trunk/gcc/toplev.c:1061
#13 0x00000001000008b4 in start ()
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fxcoudert at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |ice-on-valid-code
Known to fail| |4.5.0
Last reconfirmed|0000-00-00 00:00:00 |2009-12-29 17:42:02
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41956
