re PR rtl-optimization/53125 (Very slow compilation on SPARC)

2012-05-10  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/53125
	* ira.c (ira): Call find_moveable_pseudos or
	move_unallocated_pseudos if only ira_conflicts_p is true.

From-SVN: r187373

gcc/ChangeLog

+2012-05-10  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/53125
+	* ira.c (ira): Call find_moveable_pseudos or
+	move_unallocated_pseudos if only ira_conflicts_p is true.
+
 2012-05-10  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*movoi_internal_avx): Handle

gcc/ira.c

@@ -4125,7 +4125,12 @@ ira (FILE *f)
     }
 
   allocated_reg_info_size = max_reg_num ();
-  find_moveable_pseudos ();
+
+  /* It is not worth to do such improvement when we use a simple
+     allocation because of -O0 usage or because the function is too
+     big.  */
+  if (ira_conflicts_p)
+    find_moveable_pseudos ();
 
   max_regno_before_ira = max_reg_num ();
   ira_setup_eliminable_regset ();
@@ -4234,7 +4239,10 @@ ira (FILE *f)
 	      max_regno * sizeof (struct ira_spilled_reg_stack_slot));
     }
   allocate_initial_values (reg_equivs);
-  move_unallocated_pseudos ();
+
+  /* See comment for find_moveable_pseudos call.  */
+  if (ira_conflicts_p)
+    move_unallocated_pseudos ();
 }
 
 static void