[committed] Fix one issue reported by valgrind (PR other/58712)

[Jakub Jelinek]

Hi!

When memcpy has constant length, we leave probable_max_size uninitialized
and later on create a CONST_INT out of it.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux,
committed to trunk as obvious.

2014-01-15  Jakub Jelinek  <ja...@redhat.com>

        PR other/58712
        * builtins.c (determine_block_size): Initialize *probable_max_size
        even if len_rtx is CONST_INT.

--- gcc/builtins.c.jj   2014-01-13 13:26:37.000000000 +0100
+++ gcc/builtins.c      2014-01-13 18:21:13.299612871 +0100
@@ -3117,7 +3117,7 @@ determine_block_size (tree len, rtx len_
 {
   if (CONST_INT_P (len_rtx))
     {
-      *min_size = *max_size = UINTVAL (len_rtx);
+      *min_size = *max_size = *probable_max_size = UINTVAL (len_rtx);
       return;
     }
   else
@@ -3131,7 +3131,8 @@ determine_block_size (tree len, rtx len_
       else
        *min_size = 0;
       if (tree_fits_uhwi_p (TYPE_MAX_VALUE (TREE_TYPE (len))))
-       *probable_max_size = *max_size = tree_to_uhwi (TYPE_MAX_VALUE 
(TREE_TYPE (len)));
+       *probable_max_size = *max_size
+         = tree_to_uhwi (TYPE_MAX_VALUE (TREE_TYPE (len)));
       else
        *probable_max_size = *max_size = GET_MODE_MASK (GET_MODE (len_rtx));
 

        Jakub