===================================================================
@@ -3391,7 +3391,7 @@ bb-reorder.o : bb-reorder.c $(CONFIG_H)
tracer.o : tracer.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(RTL_H) \
$(TREE_H) $(BASIC_BLOCK_H) hard-reg-set.h output.h $(CFGLAYOUT_H) \
$(FLAGS_H) $(TIMEVAR_H) $(PARAMS_H) $(COVERAGE_H) $(FIBHEAP_H) \
- $(TREE_PASS_H) $(TREE_FLOW_H) $(TREE_INLINE_H)
+ $(TREE_PASS_H) $(TREE_FLOW_H) $(TREE_INLINE_H) $(CFGLOOP_H)
cfglayout.o : cfglayout.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
$(RTL_H) $(TREE_H) insn-config.h $(BASIC_BLOCK_H) hard-reg-set.h output.h \
$(FUNCTION_H) $(CFGLAYOUT_H) $(CFGLOOP_H) $(TARGET_H) gt-cfglayout.h \
This fixes LTO profiledbootstrap. tracer tail-duplicates loop headers; that is not profitable and it makes loops have multiple entries which inhibits further optimization. The following patch cures that. LTO profiledbootstrapped on x86_64-unknown-linux-gnu, regular testing in progress. Richard. 2012-04-04 Richard Guenther <rguenther@suse.de> PR tree-optimization/52808 * tracer.c (tail_duplicate): Do not tail-duplicate loop header blocks. * Makefile.in (tracer.o): Depend on $(CFGLOOP_H). Index: gcc/tracer.c =================================================================== *** gcc/tracer.c (revision 186134) --- gcc/tracer.c (working copy) *************** *** 52,57 **** --- 52,58 ---- #include "tree-pass.h" #include "tree-flow.h" #include "tree-inline.h" + #include "cfgloop.h" static int count_insns (basic_block); static bool ignore_bb_p (const_basic_block); *************** tail_duplicate (void) *** 307,313 **** } traced_insns += bb2->frequency * counts [bb2->index]; if (EDGE_COUNT (bb2->preds) > 1 ! && can_duplicate_block_p (bb2)) { edge e; basic_block copy; --- 308,320 ---- } traced_insns += bb2->frequency * counts [bb2->index]; if (EDGE_COUNT (bb2->preds) > 1 ! && can_duplicate_block_p (bb2) ! /* We have the tendency to duplicate the loop header ! of all do { } while loops. Do not do that - it is ! not profitable and it might create a loop with multiple ! entries or at least rotate the loop. */ ! && (!current_loops ! || bb2->loop_father->header != bb2)) { edge e; basic_block copy;