re PR middle-end/26632 (spurious warning: value computed is not used)

gcc/
	PR middle-end/26632
	* convert.c (convert_to_integer): Set TREE_NO_WARNING to 1 on
	an implicit conversion.

gcc/testsuite/
	PR middle-end/26632
	* gcc.dg/pr26632.c: New.

From-SVN: r116510

gcc/ChangeLog

+2006-08-28  Kazu Hirata  <kazu@codesourcery.com>
+
+	PR middle-end/26632
+	* convert.c (convert_to_integer): Set TREE_NO_WARNING to 1 on
+	an implicit conversion.
+
 2006-08-28  Prafulla Thakare  <prafullat@kpitcummins.com>
 
 	* config/h8300/h8300.c (TARGET_DEFAULT_TARGET_FLAGS): New.

gcc/convert.c

@@ -487,6 +487,7 @@ convert_to_integer (tree type, tree expr)
       else if (outprec >= inprec)
 	{
 	  enum tree_code code;
+	  tree tem;
 
 	  /* If the precision of the EXPR's type is K bits and the
 	     destination mode has more bits, and the sign is changing,
@@ -504,7 +505,13 @@ convert_to_integer (tree type, tree expr)
 	  else
 	    code = NOP_EXPR;
 
-	  return fold_build1 (code, type, expr);
+	  tem = fold_unary (code, type, expr);
+	  if (tem)
+	    return tem;
+
+	  tem = build1 (code, type, expr);
+	  TREE_NO_WARNING (tem) = 1;
+	  return tem;
 	}
 
       /* If TYPE is an enumeral type or a type with a precision less

gcc/testsuite/ChangeLog

+2006-08-28  Kazu Hirata  <kazu@codesourcery.com>
+
+	PR middle-end/26632
+	* gcc.dg/pr26632.c: New.
+
 2006-08-27  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/28354