ada: Avoid run-time conversion of 0 from Int to Uint

Code cleanup and tiny performance improvement; semantics is unaffected.

gcc/ada/ChangeLog:

	* exp_ch4.adb (Expand_N_Op_Subtract): Replace numeric literal
	with universal integer constant, just like it is done in
	expansion of addition operator.

diff --git a/gcc/ada/exp_ch4.adb b/gcc/ada/exp_ch4.adb
index 9024c1aebb2d659a1877717315a908292dbdc91d..b2cc672579f0e05000e8edfb74b11e8ce2037ca7 100644 (file)
--- a/gcc/ada/exp_ch4.adb
+++ b/gcc/ada/exp_ch4.adb
@@ -10031,7 +10031,7 @@ package body Exp_Ch4 is
 
       if Is_Integer_Type (Typ)
         and then Compile_Time_Known_Value (Right_Opnd (N))
-        and then Expr_Value (Right_Opnd (N)) = 0
+        and then Expr_Value (Right_Opnd (N)) = Uint_0
       then
          Rewrite (N, Left_Opnd (N));
          return;