diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 72fa4a5ee7ba343b3cb7b120e809c7c6873bbdef..5cb82911b82ac8dd03f3ade011d5b1904c010efe 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,15 @@
+2006-03-23  Maxim Kuvyrkov  <mkuvyrkov@ispras.ru>
+
+	* haifa-sched.c (choose_ready): Fix type of the local variable.
+	Move local variables.  Add comment.
+	(check_reg_live): Change signature.  Make callable from debugger.
+	* sched-int.h (check_reg_live): Update signature.
+	* sched-ebb.c (check_reg_live): Update parameters.
+	* sched-rgn.c (check_reg_live): Ditto.
+	(region_head_or_leaf_p): Check pointer before dereferencing.
+	* config/ia64/ia64.c (ia64_set_sched_flags): Disable data speculation
+	before reload on optimization levels below 1.
+
 2006-03-23  Richard Henderson  <rth@redhat.com>
 
 	* config/alpha/alpha.c (alpha_legitimate_constant_p): Reject
diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 2fb1c153366940674dd4a5cd8c5944211a4e563c..81d4f354c61b0044a4364fdc920ce5dc92a03b45 100644
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -6713,7 +6713,7 @@ ia64_set_sched_flags (spec_info_t spec_info)
     {
       int mask = 0;
 
-      if ((mflag_sched_br_data_spec && !reload_completed)
+      if ((mflag_sched_br_data_spec && !reload_completed && optimize > 0)
 	  || (mflag_sched_ar_data_spec && reload_completed))
 	{
 	  mask |= BEGIN_DATA;
diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 84311b1ba340b09ee3c934edec58045556b3ced1..56abcda64e2539a21064294ef541e00c8028c379 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -2153,11 +2153,11 @@ choose_ready (struct ready_list *ready)
 	  && spec_info->flags & (PREFER_NON_DATA_SPEC
 				 | PREFER_NON_CONTROL_SPEC))
 	{
-	  rtx x;
-	  int s;
-
 	  for (i = 0, n = ready->n_ready; i < n; i++)
 	    {
+	      rtx x;
+	      ds_t s;
+
 	      x = ready_element (ready, i);
 	      s = TODO_SPEC (x);
 	      
@@ -2185,6 +2185,8 @@ choose_ready (struct ready_list *ready)
 	  || (targetm.sched.first_cycle_multipass_dfa_lookahead_guard_spec
 	      && !targetm.sched.first_cycle_multipass_dfa_lookahead_guard_spec
 	      (insn)))
+	/* Discard speculative instruction that stands first in the ready
+	   list.  */
 	{
 	  change_queue_index (insn, 1);
 	  return 0;
@@ -4625,9 +4627,12 @@ check_sched_flags (void)
     gcc_assert (f & USE_GLAT);
 }
 
-/* Checks global_live_at_{start, end} regsets.  */
+/* Check global_live_at_{start, end} regsets.
+   If FATAL_P is TRUE, then abort execution at the first failure.
+   Overwise, print diagnostics to STDERR (this mode is for calling
+   from debugger).  */
 void
-check_reg_live (void)
+check_reg_live (bool fatal_p)
 {
   basic_block bb;
 
@@ -4638,11 +4643,30 @@ check_reg_live (void)
       i = bb->index;
 
       if (glat_start[i])
-	gcc_assert (bitmap_equal_p (bb->il.rtl->global_live_at_start,
-				     glat_start[i]));
+	{
+	  bool b = bitmap_equal_p (bb->il.rtl->global_live_at_start,
+				   glat_start[i]);
+
+	  if (!b)
+	    {
+	      gcc_assert (!fatal_p);
+
+	      fprintf (stderr, ";; check_reg_live_at_start (%d) failed.\n", i);
+	    }
+	}
+
       if (glat_end[i])
-	gcc_assert (bitmap_equal_p (bb->il.rtl->global_live_at_end,
-				     glat_end[i]));
+	{
+	  bool b = bitmap_equal_p (bb->il.rtl->global_live_at_end,
+				   glat_end[i]);
+
+	  if (!b)
+	    {
+	      gcc_assert (!fatal_p);
+
+	      fprintf (stderr, ";; check_reg_live_at_end (%d) failed.\n", i);
+	    }
+	}
     }
 }
 #endif /* ENABLE_CHECKING */
diff --git a/gcc/sched-ebb.c b/gcc/sched-ebb.c
index 4126a5d75614d2fadd6a9d8fc706bdc4b7f503ad..d7a3db9b61d459defb7091aa4250b50a4d1c2d13 100644
--- a/gcc/sched-ebb.c
+++ b/gcc/sched-ebb.c
@@ -667,7 +667,7 @@ schedule_ebbs (void)
       /* !!! We can't check reg_live_info here because of the fact,
 	 that destination registers of COND_EXEC's may be dead
 	 before scheduling (while they should be alive).  Don't know why.  */
-      /*check_reg_live ();*/
+      /*check_reg_live (true);*/
 #endif
     }
   sbitmap_free (large_region_blocks);
diff --git a/gcc/sched-int.h b/gcc/sched-int.h
index cdaca1b83f0447fae7a7eec6f93aa921141961be..175bd69dd5aead28c39aa73b36544d779ab7a0e3 100644
--- a/gcc/sched-int.h
+++ b/gcc/sched-int.h
@@ -639,7 +639,7 @@ extern void add_block (basic_block, basic_block);
 extern void attach_life_info (void);
 
 #ifdef ENABLE_CHECKING
-extern void check_reg_live (void);
+extern void check_reg_live (bool);
 #endif
 
 #endif /* GCC_SCHED_INT_H */
diff --git a/gcc/sched-rgn.c b/gcc/sched-rgn.c
index 77eec4b0df0ccf1ce9ff74f27397e598176b253f..a4f037e53517ec8780a5a5f79a48cc78e061a9ce 100644
--- a/gcc/sched-rgn.c
+++ b/gcc/sched-rgn.c
@@ -3020,7 +3020,7 @@ schedule_insns (void)
 			 : (PROP_DEATH_NOTES | PROP_REG_INFO)));
 
 #ifdef ENABLE_CHECKING
-      check_reg_live ();
+      check_reg_live (true);
 #endif
     }
 
@@ -3266,7 +3266,8 @@ region_head_or_leaf_p (basic_block bb, int leaf_p)
       i = CONTAINING_RGN (bb->index);
 
       FOR_EACH_EDGE (e, ei, bb->succs)
-	if (CONTAINING_RGN (e->dest->index) == i
+	if (e->dest != EXIT_BLOCK_PTR
+            && CONTAINING_RGN (e->dest->index) == i
 	    /* except self-loop.  */
 	    && e->dest != bb)
 	  return 0;