tree-ssa-dom.c (record_edge_info): Use last_basic_block to allocate info array.

* tree-ssa-dom.c (record_edge_info): Use last_basic_block to
	allocate info array.
	* tree-vrp.c (extract_range_from_unary_expr): Set resulting
	range to varying in cast expressions that change
	TYPE_PRECISION.

testsuite/ChangeLog

	* gcc.dg/tree-ssa/vrp14.c: New test.

From-SVN: r100554

gcc/ChangeLog

@@ -1,3 +1,11 @@
+2005-06-03  Diego Novillo  <dnovillo@redhat.com>
+
+	* tree-ssa-dom.c (record_edge_info): Use last_basic_block to
+	allocate info array.
+	* tree-vrp.c (extract_range_from_unary_expr): Set resulting
+	range to varying in cast expressions that change
+	TYPE_PRECISION.
+
 2005-06-03  Eric Christopher  <echristo@redhat.com>
 
 	* config/mips/mips.opt: Add RejectNegative to divide-breaks and

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2005-06-03  Diego Novillo  <dnovillo@redhat.com>
+
+	* gcc.dg/tree-ssa/vrp14.c: New test.
+
 2005-06-03  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/21336

gcc/testsuite/gcc.dg/tree-ssa/vrp14.c

@@ -0,0 +1,46 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+struct tree_decl
+{
+  union tree_decl_u1 {
+    int f;
+    long i;
+    struct tree_decl_u1_a {
+      unsigned int align : 24;
+      unsigned int off_align : 8;
+    } a;
+  } u1;
+};
+
+extern void abort (void);
+
+unsigned int
+assemble_variable (struct tree_decl decl)
+{
+  unsigned int align;
+
+  align = decl.u1.a.align;
+
+  if (align > (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62)))
+    align = (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62));
+
+  /* VRP should not be propagating 0 to the RHS of this assignment.
+     But it was erroneously applying a cast operation between types of
+     different precision.  align is an unsigned int with range [0,
+     0x4000000] but the .align field holds only 24 bits.  So the cast
+     was returning a [0, 0] range.  */
+  decl.u1.a.align = align;
+
+  return decl.u1.a.align;
+}
+
+main ()
+{
+  struct tree_decl decl;
+  decl.u1.a.align = 13;
+  unsigned int x = assemble_variable (decl);
+  if (x == 0)
+    abort ();
+  return 0;
+}

gcc/tree-ssa-dom.c

@@ -2422,7 +2422,7 @@ record_edge_info (basic_block bb)
 	    {
 	      tree labels = SWITCH_LABELS (stmt);
 	      int i, n_labels = TREE_VEC_LENGTH (labels);
-	      tree *info = xcalloc (n_basic_blocks, sizeof (tree));
+	      tree *info = xcalloc (last_basic_block, sizeof (tree));
 	      edge e;
 	      edge_iterator ei;
 

gcc/tree-vrp.c

@@ -1295,17 +1295,23 @@ extract_range_from_unary_expr (value_range_t *vr, tree expr)
     }
 
   /* Handle unary expressions on integer ranges.  */
-  if ((code == NOP_EXPR || code == CONVERT_EXPR)
-      && (TYPE_SIZE (TREE_TYPE (vr0.min)) != TYPE_SIZE (TREE_TYPE (expr))))
+  if (code == NOP_EXPR || code == CONVERT_EXPR)
     {
+      tree inner_type = TREE_TYPE (op0);
+      tree outer_type = TREE_TYPE (expr);
+
       /* When converting types of different sizes, set the result to
 	 VARYING.  Things like sign extensions and precision loss may
 	 change the range.  For instance, if x_3 is of type 'long long
 	 int' and 'y_5 = (unsigned short) x_3', if x_3 is ~[0, 0], it
 	 is impossible to know at compile time whether y_5 will be
 	 ~[0, 0].  */
-      set_value_range_to_varying (vr);
-      return;
+      if (TYPE_SIZE (inner_type) != TYPE_SIZE (outer_type)
+	  || TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type))
+	{
+	  set_value_range_to_varying (vr);
+	  return;
+	}
     }
 
   /* Apply the operation to each end of the range and see what we end