tree.c (get_unwidened): Decide whether to narrow a bitfield reference based on TYPE_SIZE...

        * tree.c (get_unwidened): Decide whether to narrow a bitfield
        reference based on TYPE_SIZE, not TYPE_PRECISION.
        * cp/cvt.c (convert_to_void): Don't warn about the RHS of a comma
        being useless if TREE_NO_UNUSED_WARNING is set.

        * stmt.c (parse_output_constraint): Warn about in-out constraint
        that doesn't allow a register.
        (parse_input_constraint): Warn about matching constraint that
        doesn't allow a register.

From-SVN: r74871

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/stmt.c b/gcc/stmt.c
index bc52a6b..7b388dd 100644
--- a/gcc/stmt.c
+++ b/gcc/stmt.c
@@ -1254,6 +1254,9 @@ parse_output_constraint (const char **constraint_p, int operand_num,
 	break;
       }
 
+  if (*is_inout && !*allows_reg)
+    warning ("read-write constraint does not allow a register");
+
   return true;
 }
 
@@ -1269,6 +1272,7 @@ parse_input_constraint (const char **constraint_p, int input_num,
   const char *orig_constraint = constraint;
   size_t c_len = strlen (constraint);
   size_t j;
+  bool saw_match = false;
 
   /* Assume the constraint doesn't allow the use of either
      a register or memory.  */
@@ -1320,6 +1324,8 @@ parse_input_constraint (const char **constraint_p, int input_num,
 	  char *end;
 	  unsigned long match;
 
+	  saw_match = true;
+
 	  match = strtoul (constraint + j, &end, 10);
 	  if (match >= (unsigned long) noutputs)
 	    {
@@ -1384,6 +1390,9 @@ parse_input_constraint (const char **constraint_p, int input_num,
 	break;
       }
 
+  if (saw_match && !*allows_reg)
+    warning ("matching constraint does not allow a register");
+
   return true;
 }