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[PATCH] Fix discover_iteration_bound_by_body_walk memory leaks (PR middle-end/56461)


Hi!

This function was releasing only some vectors pushed into queues vector, not
all, and wasn't releasing bounds vector.  Fixed thusly.  There is no need to
use a typedef for the C++ish vec.h vectors, and the code can be tiny bit
simplified.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2013-03-04  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/56461
	* tree-ssa-loop-niter.c (bb_queue): Remove typedef.
	(discover_iteration_bound_by_body_walk): Change queues to
	vec<vec<basic_block> > and queue to vec<basic_block>.  Fix up
	spelling in comment.  Call safe_push on queues[bound_index] directly.
	Release queues[queue_index] in every iteration unconditionally.
	Release bounds vector.

--- gcc/tree-ssa-loop-niter.c.jj	2013-02-27 23:05:07.000000000 +0100
+++ gcc/tree-ssa-loop-niter.c	2013-03-04 14:57:37.380872029 +0100
@@ -3007,9 +3007,6 @@ bound_index (vec<double_int> bounds, dou
   gcc_unreachable ();
 }
 
-/* Used to hold vector of queues of basic blocks bellow.  */
-typedef vec<basic_block> bb_queue;
-
 /* We recorded loop bounds only for statements dominating loop latch (and thus
    executed each loop iteration).  If there are any bounds on statements not
    dominating the loop latch we can improve the estimate by walking the loop
@@ -3022,8 +3019,8 @@ discover_iteration_bound_by_body_walk (s
   pointer_map_t *bb_bounds;
   struct nb_iter_bound *elt;
   vec<double_int> bounds = vNULL;
-  vec<bb_queue> queues = vNULL;
-  bb_queue queue = bb_queue();
+  vec<vec<basic_block> > queues = vNULL;
+  vec<basic_block> queue = vNULL;
   ptrdiff_t queue_index;
   ptrdiff_t latch_index = 0;
   pointer_map_t *block_priority;
@@ -3096,7 +3093,7 @@ discover_iteration_bound_by_body_walk (s
      present in the path and we look for path with largest smallest bound
      on it.
 
-     To avoid the need for fibonaci heap on double ints we simply compress
+     To avoid the need for fibonacci heap on double ints we simply compress
      double ints into indexes to BOUNDS array and then represent the queue
      as arrays of queues for every index.
      Index of BOUNDS.length() means that the execution of given BB has
@@ -3162,16 +3159,11 @@ discover_iteration_bound_by_body_walk (s
 		    }
 		    
 		  if (insert)
-		    {
-		      bb_queue queue2 = queues[bound_index];
-		      queue2.safe_push (e->dest);
-		      queues[bound_index] = queue2;
-		    }
+		    queues[bound_index].safe_push (e->dest);
 		}
 	    }
 	}
-      else
-	queues[queue_index].release ();
+      queues[queue_index].release ();
     }
 
   gcc_assert (latch_index >= 0);
@@ -3187,6 +3179,7 @@ discover_iteration_bound_by_body_walk (s
     }
 
   queues.release ();
+  bounds.release ();
   pointer_map_destroy (bb_bounds);
   pointer_map_destroy (block_priority);
 }

	Jakub


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