https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68375
Bug ID: 68375
Summary: [6 Regression] ICE in get_loop_body_in_bfs_order when
dumping cfg with -fdump-tree-optimized-graph
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
I was investigating the testcase from PR 68194
int printf (const char *, ...);
int a, c, d, e, g, h;
short f;
short
fn1 ()
{
int j[2];
for (; e; e++)
if (j[0])
for (;;)
;
if (!g)
return f;
}
int
main ()
{
for (; a < 1; a++)
{
for (c = 0; c < 2; c++)
{
d && (f = 0);
h = fn1 ();
}
printf ("%d\n", (char) f);
}
return 0;
}
and hit an ICe when compiling with -fdump-tree-optimized-graph -O2:
internal compiler error: in get_loop_body_in_bfs_order, at cfgloop.c:944
fn1 ()
^~~
0x7114e8 get_loop_body_in_bfs_order(loop const*)
../../gcc/gcc/cfgloop.c:944
0x1166ce2 draw_cfg_nodes_for_loop
../../gcc/gcc/graph.c:220
0x1166cad draw_cfg_nodes_for_loop
../../gcc/gcc/graph.c:212
0x1166e64 draw_cfg_nodes
../../gcc/gcc/graph.c:242
0x1166e64 print_graph_cfg(char const*, function*)
../../gcc/gcc/graph.c:288
0xa17806 execute_function_dump
../../gcc/gcc/passes.c:1751
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
The assert "gcc_assert (i > vc);" triggers.
Changing it to "gcc_assert (i >= vc);" fixes it for me but it was explicitly
changed to i > vc from i >= vc with:
2015-06-09 Richard Biener <[email protected]>
* cfgloop.c (get_loop_body_in_bfs_order): Fix assert.
so there must be something I'm missing?
