[PATCH] Fix leaks in vectorizable_shift (PR middle-end/56461)

Jakub Jelinek jakub@redhat.com
Fri Mar 1 20:05:00 GMT 2013


Hi!

Except for the case when we set vec_oprnd1 to non-NULL, with j == 0
we always initialize vec_oprnds[01] with vect_get_vec_defs, which overwrites
the vectors rather than just filling them.  So we shouldn't allocate the
vectors first.

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

2013-03-01  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/56461
	* tree-vect-stmts.c (vectorizable_shift): Don't call create methods
	on vec_oprnds0 or vec_oprnds1 before loop, only call it on
	vec_oprnds1 right before pushing anything to it for
	scalar_shift_arg.

--- gcc/tree-vect-stmts.c.jj	2013-02-28 22:19:57.000000000 +0100
+++ gcc/tree-vect-stmts.c	2013-03-01 11:59:03.973792955 +0100
@@ -3335,21 +3335,6 @@ vectorizable_shift (gimple stmt, gimple_
   /* Handle def.  */
   vec_dest = vect_create_destination_var (scalar_dest, vectype);
 
-  /* Allocate VECs for vector operands.  In case of SLP, vector operands are
-     created in the previous stages of the recursion, so no allocation is
-     needed, except for the case of shift with scalar shift argument.  In that
-     case we store the scalar operand in VEC_OPRNDS1 for every vector stmt to
-     be created to vectorize the SLP group, i.e., SLP_NODE->VEC_STMTS_SIZE.
-     In case of loop-based vectorization we allocate VECs of size 1.  We
-     allocate VEC_OPRNDS1 only in case of binary operation.  */
-  if (!slp_node)
-    {
-      vec_oprnds0.create (1);
-      vec_oprnds1.create (1);
-    }
-  else if (scalar_shift_arg)
-    vec_oprnds1.create (slp_node->vec_stmts_size);
-
   prev_stmt_info = NULL;
   for (j = 0; j < ncopies; j++)
     {
@@ -3369,6 +3354,7 @@ vectorizable_shift (gimple stmt, gimple_
                     dump_printf_loc (MSG_NOTE, vect_location,
                                      "operand 1 using scalar mode.");
                   vec_oprnd1 = op1;
+                  vec_oprnds1.create (slp_node ? slp_node->vec_stmts_size : 1);
                   vec_oprnds1.quick_push (vec_oprnd1);
                   if (slp_node)
                     {

	Jakub



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