[PATCH] Fix undefined behaviour in rx port

[PATCH] Fix undefined behaviour in rx port
        * config/rx/constraints.md (Int08): Fix undefined left shift
        behaviour.
        (Sint08, Sint16, Sint24): Likewise.
        * config/rx/rx.c (rx_get_stack_layout): Likewise.

From-SVN: r228254

gcc/ChangeLog

@@ -12,6 +12,11 @@
 
 2015-09-29  Jeff Law  <law@redhat.com>
 
+	* config/rx/constraints.md (Int08): Fix undefined left shift
+	behaviour.
+	(Sint08, Sint16, Sint24): Likewise.
+	* config/rx/rx.c (rx_get_stack_layout): Likewise.
+
 	* config/rl78/rl78-expand.md (movqi): Fix undefined left shift
 	behaviour.
 

gcc/config/rx/constraints.md

@@ -28,28 +28,28 @@
 (define_constraint "Int08"
   "@internal A signed or unsigned 8-bit immediate value"
   (and (match_code "const_int")
-       (match_test "IN_RANGE (ival, (-1 << 8), (1 << 8) - 1)")
+       (match_test "IN_RANGE (ival, (HOST_WIDE_INT_M1U << 8), (1 << 8) - 1)")
   )
 )
 
 (define_constraint "Sint08"
   "@internal A signed 8-bit immediate value"
   (and (match_code "const_int")
-       (match_test "IN_RANGE (ival, (-1 << 7), (1 << 7) - 1)")
+       (match_test "IN_RANGE (ival, (HOST_WIDE_INT_M1U << 7), (1 << 7) - 1)")
   )
 )
 
 (define_constraint "Sint16"
   "@internal A signed 16-bit immediate value"
   (and (match_code "const_int")
-       (match_test "IN_RANGE (ival, (-1 << 15), (1 << 15) - 1)")
+       (match_test "IN_RANGE (ival, (HOST_WIDE_INT_M1U << 15), (1 << 15) - 1)")
   )
 )
 
 (define_constraint "Sint24"
   "@internal A signed 24-bit immediate value"
   (and (match_code "const_int")
-       (match_test "IN_RANGE (ival, (-1 << 23), (1 << 23) - 1)")
+       (match_test "IN_RANGE (ival, (HOST_WIDE_INT_M1U << 23), (1 << 23) - 1)")
   )
 )
 

gcc/config/rx/rx.c

@@ -1561,7 +1561,7 @@ rx_get_stack_layout (unsigned int * lowest,
      PUSHM.
 
      FIXME: Is it worth improving this heuristic ?  */
-  pushed_mask = (-1 << low) & ~(-1 << (high + 1));
+  pushed_mask = (HOST_WIDE_INT_M1U << low) & ~(HOST_WIDE_INT_M1U << (high + 1));
   unneeded_pushes = (pushed_mask & (~ save_mask)) & pushed_mask;
 
   if ((fixed_reg && fixed_reg <= high)
@@ -1667,7 +1667,7 @@ ok_for_max_constant (HOST_WIDE_INT val)
 
   /* rx_max_constant_size specifies the maximum number
      of bytes that can be used to hold a signed value.  */
-  return IN_RANGE (val, (-1 << (rx_max_constant_size * 8)),
+  return IN_RANGE (val, (HOST_WIDE_INT_M1U << (rx_max_constant_size * 8)),
 		        ( 1 << (rx_max_constant_size * 8)));
 }