[PATCH] Fix PR c/6643

[Jakub Jelinek]

Hi!

If DECL_SIZE_UNIT is not INTEGER_CST, we'd abort with tree checking or
read e.g. PLUS_EXPR's field as if it were INTEGER_CST.
It is a regression from 3.0 (after all, widen_memory_access was added
in Dec 2001) and similar to
http://gcc.gnu.org/ml/gcc-patches/2001-12/msg02054.html
which just changed the same thing in another place in the same function.

Ok to commit to trunk/3.1.1 (once 3.1 is out)?

2002-05-13  Jakub Jelinek  <jakub@redhat.com>

	PR c/6643
	* emit-rtl.c (widen_memory_access): Only call compare_tree_int
	if DECL_SIZE_UNIT is INTEGER_CST.

--- gcc/emit-rtl.c.jj	Mon Apr 15 14:41:49 2002
+++ gcc/emit-rtl.c	Mon May 13 16:15:25 2002
@@ -2161,6 +2161,7 @@ widen_memory_access (memref, mode, offse
       /* Similarly for the decl.  */
       else if (DECL_P (expr)
 	       && DECL_SIZE_UNIT (expr)
+	       && TREE_CODE (DECL_SIZE_UNIT (expr)) == INTEGER_CST
 	       && compare_tree_int (DECL_SIZE_UNIT (expr), size) >= 0
 	       && (! memoffset || INTVAL (memoffset) >= 0))
 	break;

	Jakub