[Bug fortran/54332] [4.8 Regression] 481.wrf in SPEC CPU 2006 takes > 10GB memory to compile

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54332

--- Comment #22 from H.J. Lu <hjl.tools at gmail dot com> 2012-08-21 19:27:50 UTC ---
This seems to work:

diff --git a/gcc/df-scan.c b/gcc/df-scan.c
index 35100d1..39f444f 100644
--- a/gcc/df-scan.c
+++ b/gcc/df-scan.c
@@ -4392,6 +4392,7 @@ df_bb_verify (basic_block bb)
       if (!INSN_P (insn))
         continue;
       df_insn_refs_verify (&collection_rec, bb, insn, true);
+      df_free_collection_rec (&collection_rec);
     }

   /* Do the artificial defs and uses.  */
diff --git a/gcc/vec.h b/gcc/vec.h
index cc7e819..3a298ff 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -1031,21 +1031,9 @@ vec_reserve (vec_t<T> *vec_, int reserve MEM_STAT_DECL)
                           sizeof (T), false
                           PASS_MEM_STAT);
   else
-    {
-      /* Only allow stack vectors when re-growing them.  The initial
-     allocation of stack vectors must be done with the
-     VEC_stack_alloc macro, because it uses alloca() for the
-     allocation.  */
-      if (vec_ == NULL)
-    {
-      fprintf (stderr, "Stack vectors must be initially allocated "
-           "with VEC_stack_alloc.\n");
-      gcc_unreachable ();
-    }
-      return (vec_t<T> *) vec_stack_o_reserve (vec_, reserve,
-                           offsetof (vec_t<T>, vec),
-                           sizeof (T) PASS_MEM_STAT);
-    }
+    return (vec_t<T> *) vec_stack_o_reserve (vec_, reserve,
+                         offsetof (vec_t<T>, vec),
+                         sizeof (T) PASS_MEM_STAT);
 }