This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/39204] [4.4 Regression] ICE in compute_attic
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 17 Feb 2009 13:11:43 -0000
- Subject: [Bug tree-optimization/39204] [4.4 Regression] ICE in compute_attic
- References: <bug-39204-87@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #8 from rguenth at gcc dot gnu dot org 2009-02-17 13:11 -------
The change that the UID variations cause is ordering of two PHI-nodes which
result in
Value numbers:
-line_37 = line_18
+line_18 = line_37
from
<bb 7>:
# line_23 = PHI <line_37(9), 0B(6)>
# line_32 = PHI <line_18(9), line_29(6)>
<bb 9>:
# line_37 = PHI <line_23(17), line_14(19)>
# line_18 = PHI <line_23(17), line_14(19)>
during compute_antic we endlessly set changed to true in
/* !old->expressions can happen when we deferred a block. */
if (!old->expressions || !bitmap_set_equal (old, ANTIC_IN (block)))
{
changed = true;
SET_BIT (changed_blocks, block->index);
FOR_EACH_EDGE (e, ei, block->preds)
SET_BIT (changed_blocks, e->src->index);
only.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dberlin at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39204