[pcc] Improved :call_sig branch prediction.

git-svn-id: https://svn.parrot.org/parrot/trunk@47878 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

src/call/args.c

@@ -777,19 +777,16 @@ fill_params(PARROT_INTERP, ARGMOD_NULLOK(PMC *call_object),
        callee side only. Does not add :call_sig arg support on the caller side.
        This is not the final form of the algorithm, but should provide the
        tools that HLL designers need in the interim. */
-    if (param_count == 1) {
-        const INTVAL first_flag = raw_params[0];
-
-        if (first_flag & PARROT_ARG_CALL_SIG) {
-            *accessor->pmc(interp, arg_info, 0) = call_object;
-            return;
+    if (param_count > 2 || param_count == 0)
+        /* help branch predictors */;
+    else {
+        const INTVAL second_flag = raw_params[param_count - 1];
+        if (second_flag & PARROT_ARG_CALL_SIG) {
+            *accessor->pmc(interp, arg_info, param_count - 1) = call_object;
+            if (param_count == 1)
+                return;
         }
     }
-    else if (param_count == 2) {
-        const INTVAL second_flag = raw_params[1];
-        if (second_flag & PARROT_ARG_CALL_SIG)
-            *accessor->pmc(interp, arg_info, 1) = call_object;
-    }
 
     /* First iterate over positional args and positional parameters. */
     GETATTR_CallContext_num_positionals(interp, call_object, positional_args);