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py: Small optimisation of logic flow in BC_WITH_CLEANUP bytecode. 

Slightly smaller code, and does not need to use C stack to save
temporaries.
This commit is contained in:
Damien George 2015-02-26 17:54:50 +00:00
parent 74589cbeeb
commit 12d6d777e1
1 changed files with 12 additions and 14 deletions
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26
py/vm.c
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@ -566,26 +566,24 @@ dispatch_loop:
SET_TOP(mp_const_none);
mp_call_function_n_kw(obj, 3, 0, no_exc);
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
mp_obj_t cause = POP();
mp_obj_t cause = TOP();
switch (MP_OBJ_SMALL_INT_VALUE(cause)) {
case UNWIND_RETURN: {
mp_obj_t retval = POP();
mp_call_function_n_kw(TOP(), 3, 0, no_exc);
SET_TOP(retval);
PUSH(cause);
break;
}
case UNWIND_JUMP: {
case UNWIND_RETURN:
mp_call_function_n_kw(sp[-2], 3, 0, no_exc);
// Pop __exit__ boundmethod at sp[-2]
sp[-2] = sp[-1];
sp[-1] = sp[0];
SET_TOP(cause);
break;
}
case UNWIND_JUMP:
with_cleanup_no_other_choice:
mp_call_function_n_kw(sp[-3], 3, 0, no_exc);
// Pop __exit__ boundmethod at sp[-3]
sp[-3] = sp[-2];
break;
default:
assert(0);
goto with_cleanup_no_other_choice; // to help flow control analysis
}
sp[-2] = sp[-1]; // copy retval down
sp[-1] = sp[0]; // copy cause down
sp--; // discard top value (was cause)
} else if (mp_obj_is_exception_type(TOP())) {
// Need to pass (sp[0], sp[-1], sp[-2]) as arguments so must reverse the
// order of these on the value stack (don't want to create a temporary