From: Richard Kenner <kenner@gcc.gnu.org>
Date: Sat, 2 Aug 1997 22:50:39 +0000 (-0400)
Subject: (int_fits_type_p): Negative ints never fit unsigned types, and
X-Git-Tag: misc/cutover-egcs-0~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ae0a3dfbf49c9bcd36520a722c544f30f19b441b;p=thirdparty%2Fgcc.git

(int_fits_type_p): Negative ints never fit unsigned types, and
unsigned ints with top-bit-set never fit signed types.

From-SVN: r14637
---

diff --git a/gcc/tree.c b/gcc/tree.c
index f756d05faa7d..658c05f86840 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -4346,12 +4346,18 @@ int_fits_type_p (c, type)
     return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
 	       && INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type), c))
 	    && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
-		  && INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type))));
+		  && INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type)))
+	    /* Negative ints never fit unsigned types.  */
+	    && ! (TREE_INT_CST_HIGH (c) < 0
+		  && ! TREE_UNSIGNED (TREE_TYPE (c))));
   else
     return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
 	       && INT_CST_LT (TYPE_MAX_VALUE (type), c))
 	    && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
-		  && INT_CST_LT (c, TYPE_MIN_VALUE (type))));
+		  && INT_CST_LT (c, TYPE_MIN_VALUE (type)))
+	    /* Unsigned ints with top bit set never fit signed types.  */
+	    && ! (TREE_INT_CST_HIGH (c) < 0
+		  && TREE_UNSIGNED (TREE_TYPE (c))));
 }
 
 /* Return the innermost context enclosing DECL that is