2015-07-14 Richard Biener <[email protected]>

	PR tree-optimization/66863
	* tree-vrp.c (register_edge_assert_for_2): Properly restrict
	what we record for conversion use stmt lhs inequalities.

	* gcc.dg/torture/pr66863.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225768 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2015-07-14  Richard Biener  <[email protected]>
+
+	PR tree-optimization/66863
+	* tree-vrp.c (register_edge_assert_for_2): Properly restrict
+	what we record for conversion use stmt lhs inequalities.
+
 2015-07-14  Richard Biener  <[email protected]>
 
 	* genmatch.c (dt_node::gen_kids_1): Fix case label indenting.

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2015-07-14  Richard Biener  <[email protected]>
+
+	PR tree-optimization/66863
+	* gcc.dg/torture/pr66863.c: New testcase.
+
 2015-07-13  Patrick Palka  <[email protected]>
 
 	PR c++/65186

gcc/testsuite/gcc.dg/torture/pr66863.c

@@ -0,0 +1,25 @@
+/* { dg-do run } */
+
+int a, b;
+
+int
+fn1 (int p1)
+{
+  if (p1 < -2147483647) 
+    return 0;
+  else 
+    return 1;
+}
+
+int
+fn2 (int p1, short p2)
+{
+  return p2 ? p1 % p2 : 0; 
+}
+
+int
+main ()
+{
+  b = fn2 (fn1 (a), a);
+  return 0;
+}

gcc/tree-vrp.c

@@ -5381,7 +5381,17 @@ register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi,
 	      cst = int_const_binop (code, val, cst);
 	    }
 	  else if (CONVERT_EXPR_CODE_P (code))
-	    cst = fold_convert (TREE_TYPE (name2), val);
+	    {
+	      /* For truncating conversions require that the constant
+	         fits in the truncated type if we are going to record
+		 an inequality.  */
+	      if (comp_code == NE_EXPR
+		  && (TYPE_PRECISION (TREE_TYPE (name2))
+		      < TYPE_PRECISION (TREE_TYPE (name)))
+		  && ! int_fits_type_p (val, TREE_TYPE (name2)))
+		continue;
+	      cst = fold_convert (TREE_TYPE (name2), val);
+	    }
 	  else
 	    continue;