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py: Optimise call to mp_arg_check_num by compressing fun signature.

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With 5 arguments to mp_arg_check_num(), some architectures need to pass
values on the stack.  So compressing n_args_min, n_args_max, takes_kw into
a single word and passing only 3 arguments makes the call more efficient,
because almost all calls to this function pass in constant values.  Code
size is also reduced by a decent amount:

   bare-arm:  -116
minimal x86:   -64
   unix x64:  -256
unix nanbox:  -112
      stm32:  -324
     cc3200:  -192
    esp8266:  -192
      esp32:  -144
This commit is contained in:
Damien George
2018-09-14 13:39:17 +10:00
parent 0f4d595beb
commit 9f241ef398
4 changed files with 19 additions and 11 deletions
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4
py/objfun.c
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@@ -110,9 +110,9 @@ STATIC mp_obj_t fun_builtin_var_call(mp_obj_t self_in, size_t n_args, size_t n_k
mp_obj_fun_builtin_var_t *self = MP_OBJ_TO_PTR(self_in);
// check number of arguments
mp_arg_check_num(n_args, n_kw, self->n_args_min, self->n_args_max, self->is_kw);
mp_arg_check_num_sig(n_args, n_kw, self->sig);
if (self->is_kw) {
if (self->sig & 1) {
// function allows keywords
// we create a map directly from the given args array