cse.c (fold_rtx): Instantiate CONSTANT_P_RTX to 0 when not optimizing, even if flag_gcse is true.

	* cse.c (fold_rtx): Instantiate CONSTANT_P_RTX to 0 when not
	optimizing, even if flag_gcse is true.
	* toplev.c (rest_of_compilation): purge_builtin_constant_p
	only needs to be called when "optimize > 0 && flag_gcse".

From-SVN: r61785

gcc/ChangeLog

+2002-01-25  Roger Sayle  <roger@eyesopen.com>
+
+	* cse.c (fold_rtx): Instantiate CONSTANT_P_RTX to 0 when not
+	optimizing, even if flag_gcse is true.
+	* toplev.c (rest_of_compilation): purge_builtin_constant_p
+	only needs to be called when "optimize > 0 && flag_gcse".
+
 2003-01-25  Roger Sayle  <roger@eyesopen.com>
 
 	* stmt.c (emit_case_bit_tests): New routine to implement suitable

gcc/cse.c

@@ -4338,7 +4338,7 @@ fold_rtx (x, insn)
 	{
 	  if (const_arg0)
 	    return const1_rtx;
-	  if (!flag_gcse)
+	  if (optimize == 0 || !flag_gcse)
 	    return const0_rtx;
 	}
       break;

gcc/toplev.c

@@ -2925,7 +2925,8 @@ rest_of_compilation (decl)
     }
 
   /* Instantiate any remaining CONSTANT_P_RTX nodes.  */
-  purge_builtin_constant_p ();
+  if (optimize > 0 && flag_gcse)
+    purge_builtin_constant_p ();
 
   /* Move constant computations out of loops.  */