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py/emitnative: Optimise for iteration asm code for non-debug build. 

In non-debug mode MP_OBJ_STOP_ITERATION is zero and comparing something to
zero can be done more efficiently in assembler than comparing to a non-zero
value.
This commit is contained in:
Damien George 2018-07-12 18:08:01 +10:00
parent d974ee1c2f
commit 8c9c167dc6
1 changed files with 5 additions and 0 deletions
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py/emitnative.c
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@ -1737,8 +1737,13 @@ STATIC void emit_native_for_iter(emit_t *emit, mp_uint_t label) {
emit_get_stack_pointer_to_reg_for_pop(emit, REG_ARG_1, MP_OBJ_ITER_BUF_NSLOTS);
adjust_stack(emit, MP_OBJ_ITER_BUF_NSLOTS);
emit_call(emit, MP_F_NATIVE_ITERNEXT);
#ifdef NDEBUG
MP_STATIC_ASSERT(MP_OBJ_STOP_ITERATION == 0);
ASM_JUMP_IF_REG_ZERO(emit->as, REG_RET, label);
#else
ASM_MOV_REG_IMM(emit->as, REG_TEMP1, (mp_uint_t)MP_OBJ_STOP_ITERATION);
ASM_JUMP_IF_REG_EQ(emit->as, REG_RET, REG_TEMP1, label);
#endif
emit_post_push_reg(emit, VTYPE_PYOBJ, REG_RET);
}