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py: Add option to cache map lookup results in bytecode.

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This is a simple optimisation inspired by JITing technology: we cache in
the bytecode (using 1 byte) the offset of the last successful lookup in
a map. This allows us next time round to check in that location in the
hash table (mp_map_t) for the desired entry, and if it's there use that
entry straight away.  Otherwise fallback to a normal map lookup.

Works for LOAD_NAME, LOAD_GLOBAL, LOAD_ATTR and STORE_ATTR opcodes.

On a few tests it gives >90% cache hit and greatly improves speed of
code.

Disabled by default.  Enabled for unix and stmhal ports.
This commit is contained in:
Damien George
2015-01-06 12:51:39 +00:00
parent b4b10fd350
commit 7ee91cf861
7 changed files with 142 additions and 4 deletions
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8
py/objtype.c
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@@ -456,7 +456,7 @@ STATIC mp_obj_t instance_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_i
}
}
STATIC void instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
void mp_obj_instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
// logic: look in obj members then class locals (TODO check this against CPython)
assert(is_instance_type(mp_obj_get_type(self_in)));
mp_obj_instance_t *self = self_in;
@@ -510,7 +510,7 @@ STATIC void instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
}
}
STATIC bool instance_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
bool mp_obj_instance_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
mp_obj_instance_t *self = self_in;
#if MICROPY_PY_BUILTINS_PROPERTY
@@ -817,8 +817,8 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
o->make_new = instance_make_new;
o->unary_op = instance_unary_op;
o->binary_op = instance_binary_op;
o->load_attr = instance_load_attr;
o->store_attr = instance_store_attr;
o->load_attr = mp_obj_instance_load_attr;
o->store_attr = mp_obj_instance_store_attr;
o->subscr = instance_subscr;
o->call = mp_obj_instance_call;
o->getiter = instance_getiter;