From: Richard Kenner <kenner@gcc.gnu.org>
Date: Mon, 6 May 1996 19:41:35 +0000 (-0400)
Subject: (truthvalue_conversion, case ADDR_EXPR): Don't treat address of
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fc0c675f04a8eb8d197c6e924c6f2d4198a69041;p=gcc.git

(truthvalue_conversion, case ADDR_EXPR): Don't treat address of
external decl as always nonzero.

From-SVN: r11941
---

diff --git a/gcc/c-common.c b/gcc/c-common.c
index 3c9018ad268..8a834dd072f 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -2080,6 +2080,12 @@ truthvalue_conversion (expr)
       return real_zerop (expr) ? boolean_false_node : boolean_true_node;
 
     case ADDR_EXPR:
+      /* If we are taking the address of a external decl, it might be zero
+	 if it is weak, so we cannot optimize.  */
+      if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (expr, 0))) == 'd'
+	  && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
+	break;
+
       if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
 	return build (COMPOUND_EXPR, boolean_type_node,
 		      TREE_OPERAND (expr, 0), boolean_true_node);