From: Richard Stallman <rms@gnu.org>
Date: Thu, 11 Mar 1993 08:18:16 +0000 (+0000)
Subject: (const_binop): When evaluating a shift, ignore
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=88ece8db619050933051cfd6ef3f42ea5eba16a1;p=gcc.git

(const_binop): When evaluating a shift, ignore
overflows generated by force_fit_type.

From-SVN: r3700
---

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index fe9b72dd33c..ec04f44ae65 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1095,7 +1095,12 @@ const_binop (code, arg1, arg2, notrunc)
 			 &low, &hi,
 			 !uns);
 	  t = build_int_2 (low, hi);
-	  break;
+	  TREE_TYPE (t) = TREE_TYPE (arg1);
+	  if (!notrunc)
+	    force_fit_type (t, 0);
+	  TREE_CONSTANT_OVERFLOW (t)
+	    = TREE_CONSTANT_OVERFLOW (arg1) | TREE_CONSTANT_OVERFLOW (arg2);
+	  return t;
 
 	case RROTATE_EXPR:
 	  int2l = - int2l;