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Optimise away bytecode dispatch. #3

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Merged
ltratt merged 1 commit into from
Mar 6, 2026
Merged

Optimise away bytecode dispatch. #3

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17 changes: 16 additions & 1 deletion py/vm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -215,6 +215,17 @@ MP_NOINLINE static mp_obj_t *build_slice_stack_allocated(byte op, mp_obj_t *sp,
}
#endif

#ifdef USE_YK
// Elide instruction lookup.
//
// FIXME: Can the bytecode be mutated? If so we would need to add and promote a
// bytecode version tag (see yklua for an example).
__attribute__((yk_idempotent))
byte load_inst(const byte *pc) {
return *pc;
}
#endif

// fastn has items in reverse order (fastn[0] is local[0], fastn[-1] is local[1], etc)
// sp points to bottom of stack which grows up
// returns:
Expand Down Expand Up @@ -339,8 +350,12 @@ FRAME_SETUP();
#ifdef USE_YK
mp_uint_t locidx = ip - code_state->fun_bc->bytecode;
yk_mt_control_point(mp_state_ctx.ykmt, &yklocs[locidx]);
ip = (const byte *) yk_promote((void *) ip);
byte opcode = load_inst(ip++);
#else
byte opcode = *ip++;
#endif
switch (*ip++) {
switch (opcode) {
#endif

ENTRY(MP_BC_LOAD_CONST_FALSE):
Expand Down