From 138c94ea17d7d83587a3cac9978124967ba1b5b7 Mon Sep 17 00:00:00 2001
From: Richard Kenner <kenner@gcc.gnu.org>
Date: Fri, 9 Jun 1995 18:01:39 -0400
Subject: (left_shift): Ignore integer overflow.

From-SVN: r9915
---
 gcc/cexp.y | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

(limited to 'gcc/cexp.y')

diff --git a/gcc/cexp.y b/gcc/cexp.y
index 6082fec..79282b7 100644
--- a/gcc/cexp.y
+++ b/gcc/cexp.y
@@ -898,21 +898,15 @@ left_shift (a, b)
      struct constant *a;
      unsigned long b;
 {
+   /* It's unclear from the C standard whether shifts can overflow.
+      The following code ignores overflow; perhaps a C standard
+      interpretation ruling is needed.  */
   if (b >= HOST_BITS_PER_LONG)
-    {
-      if (! a->unsignedp && a->value != 0)
-	integer_overflow ();
-      return 0;
-    }
+    return 0;
   else if (a->unsignedp)
     return (unsigned long) a->value << b;
   else
-    {
-      long l = a->value << b;
-      if (l >> b != a->value)
-	integer_overflow ();
-      return l;
-    }
+    return a->value << b;
 }
 
 static long
-- 
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