The ifcvt changes cause 464.h264ref to fail to build exhausting virtual memory.
This is appearantly because of shared trees in
#71 0x0000000000a1abe3 in add_to_dst_predicate_list (loop=0x7ffff7edf3f0,
e=0x7ffff59a2d40, prev_cond=0x7fffc8c0b0e0, cond=0x7fffc8c0b118)
at /space/rguenther/src/svn/trunk/gcc/tree-if-conv.c:172
172 new_cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node,
(gdb) l
167 /* Add the condition COND to the e->aux field. In case the edge
168 destination is a PHI node, this condition will be added to
169 the block predicate to construct a complete condition. */
170 e->aux = cond;
171
172 new_cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node,
173 unshare_expr (prev_cond), cond);
so unsharing never finishes (well, or maybe we just endlessly add
conds here - which is equally bad).
--
Summary: [4.6 Regression] 464.h264ref fails to build.
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44306
