optimizer_bytecodes.c

#include "Python.h"
#include "pycore_optimizer.h"
#include "pycore_uops.h"
#include "pycore_uop_ids.h"
#include "internal/pycore_moduleobject.h"

#define op(name, ...) /* NAME is ignored */

typedef struct _Py_UOpsAbstractFrame _Py_UOpsAbstractFrame;

/* Shortened forms for convenience */
#define sym_is_not_null _Py_uop_sym_is_not_null
#define sym_is_const _Py_uop_sym_is_const
#define sym_get_const _Py_uop_sym_get_const
#define sym_new_unknown _Py_uop_sym_new_unknown
#define sym_new_not_null _Py_uop_sym_new_not_null
#define sym_new_type _Py_uop_sym_new_type
#define sym_is_null _Py_uop_sym_is_null
#define sym_new_const _Py_uop_sym_new_const
#define sym_new_null _Py_uop_sym_new_null
#define sym_matches_type _Py_uop_sym_matches_type
#define sym_matches_type_version _Py_uop_sym_matches_type_version
#define sym_get_type _Py_uop_sym_get_type
#define sym_has_type _Py_uop_sym_has_type
#define sym_set_null(SYM) _Py_uop_sym_set_null(ctx, SYM)
#define sym_set_non_null(SYM) _Py_uop_sym_set_non_null(ctx, SYM)
#define sym_set_type(SYM, TYPE) _Py_uop_sym_set_type(ctx, SYM, TYPE)
#define sym_set_type_version(SYM, VERSION) _Py_uop_sym_set_type_version(ctx, SYM, VERSION)
#define sym_set_const(SYM, CNST) _Py_uop_sym_set_const(ctx, SYM, CNST)
#define sym_set_compact_int(SYM) _Py_uop_sym_set_compact_int(ctx, SYM)
#define sym_is_bottom _Py_uop_sym_is_bottom
#define frame_new _Py_uop_frame_new
#define frame_new_from_symbol _Py_uop_frame_new_from_symbol
#define frame_pop _Py_uop_frame_pop
#define sym_new_tuple _Py_uop_sym_new_tuple
#define sym_tuple_getitem _Py_uop_sym_tuple_getitem
#define sym_tuple_length _Py_uop_sym_tuple_length
#define sym_is_immortal _Py_uop_symbol_is_immortal
#define sym_new_compact_int _Py_uop_sym_new_compact_int
#define sym_is_compact_int _Py_uop_sym_is_compact_int
#define sym_new_truthiness _Py_uop_sym_new_truthiness
#define sym_new_predicate _Py_uop_sym_new_predicate
#define sym_apply_predicate_narrowing _Py_uop_sym_apply_predicate_narrowing
#define sym_set_recorded_type(SYM, TYPE) _Py_uop_sym_set_recorded_type(ctx, SYM, TYPE)
#define sym_set_recorded_value(SYM, VAL) _Py_uop_sym_set_recorded_value(ctx, SYM, VAL)
#define sym_set_recorded_gen_func(SYM, VAL) _Py_uop_sym_set_recorded_gen_func(ctx, SYM, VAL)
#define sym_get_probable_func_code _Py_uop_sym_get_probable_func_code
#define sym_get_probable_value _Py_uop_sym_get_probable_value
#define sym_get_probable_type _Py_uop_sym_get_probable_type
#define sym_set_stack_depth(DEPTH, SP) _Py_uop_sym_set_stack_depth(ctx, DEPTH, SP)

extern int
optimize_to_bool(
    _PyUOpInstruction *this_instr,
    JitOptContext *ctx,
    JitOptSymbol *value,
    JitOptSymbol **result_ptr,
    bool insert_mode);

extern void
eliminate_pop_guard(_PyUOpInstruction *this_instr, JitOptContext *ctx, bool exit);

extern PyCodeObject *get_code(_PyUOpInstruction *op);

static int
dummy_func(void) {

    PyCodeObject *co;
    int oparg;
    JitOptSymbol *flag;
    JitOptSymbol *left;
    JitOptSymbol *right;
    JitOptSymbol *value;
    JitOptSymbol *res;
    JitOptSymbol *iter;
    JitOptSymbol *top;
    JitOptSymbol *bottom;
    _Py_UOpsAbstractFrame *frame;
    _Py_UOpsAbstractFrame *new_frame;
    JitOptContext *ctx;
    _PyUOpInstruction *this_instr;
    _PyBloomFilter *dependencies;
    int modified;
    int curr_space;
    int max_space;
    _PyUOpInstruction *first_valid_check_stack;
    _PyUOpInstruction *corresponding_check_stack;

// BEGIN BYTECODES //

    op(_MAKE_HEAP_SAFE, (value -- value)) {
        // eliminate _MAKE_HEAP_SAFE when we *know* the value is immortal
        if (sym_is_immortal(PyJitRef_Unwrap(value))) {
            ADD_OP(_NOP, 0, 0);
        }
        value = PyJitRef_StripBorrowInfo(value);
    }

    op(_COPY_FREE_VARS, (--)) {
        PyCodeObject *co = get_current_code_object(ctx);
        if (co == NULL) {
            ctx->done = true;
            break;
        }
        int offset = co->co_nlocalsplus - oparg;
        for (int i = 0; i < oparg; ++i) {
            ctx->frame->locals[offset + i] = sym_new_not_null(ctx);
        }
    }

    op(_LOAD_FAST_CHECK, (-- value)) {
        value = GETLOCAL(oparg);
        // We guarantee this will error - just bail and don't optimize it.
        if (sym_is_null(value)) {
            ctx->done = true;
        }
        assert(!PyJitRef_IsUnique(value));
    }

    op(_LOAD_FAST, (-- value)) {
        value = GETLOCAL(oparg);
        assert(!PyJitRef_IsUnique(value));
    }

    op(_LOAD_FAST_BORROW, (-- value)) {
        value = PyJitRef_Borrow(GETLOCAL(oparg));
        assert(!PyJitRef_IsUnique(value));
    }

    op(_LOAD_FAST_AND_CLEAR, (-- value)) {
        value = GETLOCAL(oparg);
        JitOptRef temp = sym_new_null(ctx);
        GETLOCAL(oparg) = temp;
        assert(!PyJitRef_IsUnique(value));
    }

    op(_STORE_ATTR_INSTANCE_VALUE, (offset/1, value, owner -- o)) {
        (void)offset;
        (void)value;
        o = owner;
    }

    op(_STORE_ATTR_WITH_HINT, (hint/1, value, owner -- o)) {
        (void)hint;
        (void)value;
        o = owner;
    }

    op(_SWAP_FAST, (value -- trash)) {
        JitOptRef tmp = GETLOCAL(oparg);
        GETLOCAL(oparg) = PyJitRef_RemoveUnique(value);
        trash = tmp;
    }

    op(_STORE_SUBSCR_LIST_INT, (value, list_st, sub_st -- ls, ss)) {
        (void)value;
        ls = list_st;
        ss = sub_st;
    }

    op(_STORE_ATTR_SLOT, (index/1, value, owner -- o)) {
        (void)index;
        (void)value;
        o = owner;
    }

    op(_STORE_SUBSCR_DICT, (value, dict_st, sub -- st)) {
        (void)value;
        st = dict_st;
    }

    op(_PUSH_NULL, (-- res)) {
        res = PyJitRef_Borrow(sym_new_null(ctx));
    }

    op(_GUARD_TOS_INT, (value -- value)) {
        if (sym_is_compact_int(value)) {
            ADD_OP(_NOP, 0, 0);
        }
        else {
            if (sym_get_type(value) == &PyLong_Type) {
                ADD_OP(_GUARD_TOS_OVERFLOWED, 0, 0);
            }
            sym_set_compact_int(value);
        }
    }

    op(_GUARD_NOS_INT, (left, unused -- left, unused)) {
        if (sym_is_compact_int(left)) {
            ADD_OP(_NOP, 0, 0);
        }
        else {
            if (sym_get_type(left) == &PyLong_Type) {
                ADD_OP(_GUARD_NOS_OVERFLOWED, 0, 0);
            }
            sym_set_compact_int(left);
        }
    }

    op(_CHECK_ATTR_CLASS, (type_version/2, owner -- owner)) {
        PyObject *type = (PyObject *)_PyType_LookupByVersion(type_version);
        if (type) {
            if (type == sym_get_const(ctx, owner)) {
                ADD_OP(_NOP, 0, 0);
            }
            else {
                sym_set_const(owner, type);
            }
        }
    }

    op(_GUARD_TYPE_VERSION, (type_version/2, owner -- owner)) {
        assert(type_version);
        assert(this_instr[-1].opcode == _RECORD_TOS_TYPE);
        if (sym_matches_type_version(owner, type_version)) {
            ADD_OP(_NOP, 0, 0);
        } else {
            // add watcher so that whenever the type changes we invalidate this
            PyTypeObject *type = _PyType_LookupByVersion(type_version);
            // if the type is null, it was not found in the cache (there was a conflict)
            // with the key, in which case we can't trust the version
            if (type) {
                // if the type version was set properly, then add a watcher
                // if it wasn't this means that the type version was previously set to something else
                // and we set the owner to bottom, so we don't need to add a watcher because we must have
                // already added one earlier.
                if (sym_set_type_version(owner, type_version)) {
                    PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
                    _Py_BloomFilter_Add(dependencies, type);
                }
            }
        }
    }

    op(_GUARD_TOS_FLOAT, (value -- value)) {
        if (sym_matches_type(value, &PyFloat_Type)) {
            ADD_OP(_NOP, 0, 0);
        }
        sym_set_type(value, &PyFloat_Type);
    }

    op(_GUARD_NOS_FLOAT, (left, unused -- left, unused)) {
        if (sym_matches_type(left, &PyFloat_Type)) {
            ADD_OP(_NOP, 0, 0);
        }
        sym_set_type(left, &PyFloat_Type);
    }

    op(_BINARY_OP, (lhs, rhs -- res, l, r)) {
        l = lhs;
        r = rhs;
        REPLACE_OPCODE_IF_EVALUATES_PURE(lhs, rhs, res);
        bool lhs_int = sym_matches_type(lhs, &PyLong_Type);
        bool rhs_int = sym_matches_type(rhs, &PyLong_Type);
        bool lhs_float = sym_matches_type(lhs, &PyFloat_Type);
        bool rhs_float = sym_matches_type(rhs, &PyFloat_Type);
        if (!((lhs_int || lhs_float) && (rhs_int || rhs_float))) {
            // There's something other than an int or float involved:
            res = sym_new_unknown(ctx);
        }
        else if (oparg == NB_POWER || oparg == NB_INPLACE_POWER) {
            // This one's fun... the *type* of the result depends on the
            // *values* being exponentiated. However, exponents with one
            // constant part are reasonably common, so it's probably worth
            // trying to infer some simple cases:
            // - A: 1 ** 1 -> 1 (int ** int -> int)
            // - B: 1 ** -1 -> 1.0 (int ** int -> float)
            // - C: 1.0 ** 1 -> 1.0 (float ** int -> float)
            // - D: 1 ** 1.0 -> 1.0 (int ** float -> float)
            // - E: -1 ** 0.5 ~> 1j (int ** float -> complex)
            // - F: 1.0 ** 1.0 -> 1.0 (float ** float -> float)
            // - G: -1.0 ** 0.5 ~> 1j (float ** float -> complex)
            if (rhs_float) {
                // Case D, E, F, or G... can't know without the sign of the LHS
                // or whether the RHS is whole, which isn't worth the effort:
                res = sym_new_unknown(ctx);
            }
            else if (lhs_float) {
                // Case C:
                res = sym_new_type(ctx, &PyFloat_Type);
            }
            else if (!sym_is_const(ctx, rhs)) {
                // Case A or B... can't know without the sign of the RHS:
                res = sym_new_unknown(ctx);
            }
            else if (_PyLong_IsNegative((PyLongObject *)sym_get_const(ctx, rhs))) {
                // Case B:
                res = sym_new_type(ctx, &PyFloat_Type);
            }
            else {
                // Case A:
                res = sym_new_type(ctx, &PyLong_Type);
            }
        }
        else if (oparg == NB_TRUE_DIVIDE || oparg == NB_INPLACE_TRUE_DIVIDE) {
            res = sym_new_type(ctx, &PyFloat_Type);
        }
        else if (lhs_int && rhs_int) {
            res = sym_new_type(ctx, &PyLong_Type);
        }
        else {
            res = sym_new_type(ctx, &PyFloat_Type);
        }
    }

    op(_BINARY_OP_ADD_INT, (left, right -- res, l, r)) {
        res = sym_new_compact_int(ctx);
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_BINARY_OP_SUBTRACT_INT, (left, right -- res, l, r)) {
        res = sym_new_compact_int(ctx);
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_BINARY_OP_MULTIPLY_INT, (left, right -- res, l, r)) {
        res = sym_new_compact_int(ctx);
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_BINARY_OP_ADD_FLOAT, (left, right -- res, l, r)) {
        if (PyJitRef_IsUnique(left)) {
            ADD_OP(_BINARY_OP_ADD_FLOAT_INPLACE, 0, 0);
            l = PyJitRef_Borrow(sym_new_null(ctx));
            r = right;
        }
        else if (PyJitRef_IsUnique(right)) {
            ADD_OP(_BINARY_OP_ADD_FLOAT_INPLACE_RIGHT, 0, 0);
            l = left;
            r = PyJitRef_Borrow(sym_new_null(ctx));
        }
        else {
            l = left;
            r = right;
        }
        res = PyJitRef_MakeUnique(sym_new_type(ctx, &PyFloat_Type));
    }

    op(_BINARY_OP_SUBTRACT_FLOAT, (left, right -- res, l, r)) {
        if (PyJitRef_IsUnique(left)) {
            ADD_OP(_BINARY_OP_SUBTRACT_FLOAT_INPLACE, 0, 0);
            l = PyJitRef_Borrow(sym_new_null(ctx));
            r = right;
        }
        else if (PyJitRef_IsUnique(right)) {
            ADD_OP(_BINARY_OP_SUBTRACT_FLOAT_INPLACE_RIGHT, 0, 0);
            l = left;
            r = PyJitRef_Borrow(sym_new_null(ctx));
        }
        else {
            l = left;
            r = right;
        }
        res = PyJitRef_MakeUnique(sym_new_type(ctx, &PyFloat_Type));
    }

    op(_BINARY_OP_MULTIPLY_FLOAT, (left, right -- res, l, r)) {
        if (PyJitRef_IsUnique(left)) {
            ADD_OP(_BINARY_OP_MULTIPLY_FLOAT_INPLACE, 0, 0);
            l = PyJitRef_Borrow(sym_new_null(ctx));
            r = right;
        }
        else if (PyJitRef_IsUnique(right)) {
            ADD_OP(_BINARY_OP_MULTIPLY_FLOAT_INPLACE_RIGHT, 0, 0);
            l = left;
            r = PyJitRef_Borrow(sym_new_null(ctx));
        }
        else {
            l = left;
            r = right;
        }
        res = PyJitRef_MakeUnique(sym_new_type(ctx, &PyFloat_Type));
    }

    op(_BINARY_OP_ADD_UNICODE, (left, right -- res, l, r)) {
        res = sym_new_type(ctx, &PyUnicode_Type);
        l = left;
        r = right;
    }

    op(_BINARY_OP_EXTEND, (descr/4, left, right -- res, l, r)) {
        (void)descr;
        res = sym_new_not_null(ctx);
        l = left;
        r = right;
    }

    op(_BINARY_OP_INPLACE_ADD_UNICODE, (left, right -- res)) {
        if (sym_is_const(ctx, left) && sym_is_const(ctx, right)) {
            assert(PyUnicode_CheckExact(sym_get_const(ctx, left)));
            assert(PyUnicode_CheckExact(sym_get_const(ctx, right)));
            PyObject *temp = PyUnicode_Concat(sym_get_const(ctx, left), sym_get_const(ctx, right));
            if (temp == NULL) {
                goto error;
            }
            res = sym_new_const(ctx, temp);
            Py_DECREF(temp);
        }
        else {
            res = sym_new_type(ctx, &PyUnicode_Type);
        }
        GETLOCAL(this_instr->operand0) = sym_new_null(ctx);
    }

    op(_BINARY_OP_SUBSCR_CHECK_FUNC, (container, unused -- container, unused, getitem)) {
        getitem = sym_new_not_null(ctx);
        PyTypeObject *tp = sym_get_type(container);
        if (tp == NULL) {
            PyObject *c = sym_get_probable_value(container);
            if (c != NULL) {
                tp = Py_TYPE(c);
            }
        }
        if (tp != NULL) {
            PyObject *getitem_o = ((PyHeapTypeObject *)tp)->_spec_cache.getitem;
            sym_set_recorded_value(getitem, getitem_o);
        }
    }

    op(_BINARY_OP_SUBSCR_INIT_CALL, (container, sub, getitem -- new_frame)) {
        _Py_UOpsAbstractFrame *f = frame_new_from_symbol(ctx, getitem, NULL, 0);
        if (f == NULL) {
            break;
        }
        f->locals[0] = container;
        f->locals[1] = sub;
        new_frame = PyJitRef_WrapInvalid(f);
    }

    op(_BINARY_OP_SUBSCR_STR_INT, (str_st, sub_st -- res, s, i)) {
        res = sym_new_type(ctx, &PyUnicode_Type);
        s = str_st;
        i = sub_st;
    }

    op(_BINARY_OP_SUBSCR_USTR_INT, (str_st, sub_st -- res, s, i)) {
        res = sym_new_type(ctx, &PyUnicode_Type);
        s = str_st;
        i = sub_st;
    }

    op(_GUARD_BINARY_OP_SUBSCR_TUPLE_INT_BOUNDS, (tuple_st, sub_st -- tuple_st, sub_st)) {
        assert(sym_matches_type(tuple_st, &PyTuple_Type));
        if (sym_is_const(ctx, sub_st)) {
            assert(PyLong_CheckExact(sym_get_const(ctx, sub_st)));
            long index = PyLong_AsLong(sym_get_const(ctx, sub_st));
            assert(index >= 0);
            Py_ssize_t tuple_length = sym_tuple_length(tuple_st);
            if (tuple_length != -1 && index < tuple_length) {
                ADD_OP(_NOP, 0, 0);
            }
        }
    }

    op(_BINARY_OP_SUBSCR_TUPLE_INT, (tuple_st, sub_st -- res, ts, ss)) {
        assert(sym_matches_type(tuple_st, &PyTuple_Type));
        if (sym_is_const(ctx, sub_st)) {
            assert(PyLong_CheckExact(sym_get_const(ctx, sub_st)));
            long index = PyLong_AsLong(sym_get_const(ctx, sub_st));
            assert(index >= 0);
            Py_ssize_t tuple_length = sym_tuple_length(tuple_st);
            if (tuple_length == -1) {
                // Unknown length
                res = sym_new_not_null(ctx);
            }
            else {
                assert(index < tuple_length);
                res = sym_tuple_getitem(ctx, tuple_st, index);
            }
        }
        else {
            res = sym_new_not_null(ctx);
        }
        ts = tuple_st;
        ss = sub_st;
    }

    op(_BINARY_OP_SUBSCR_DICT, (dict_st, sub_st -- res, ds, ss)) {
        res = sym_new_not_null(ctx);
        ds = dict_st;
        ss = sub_st;
    }

    op(_BINARY_OP_SUBSCR_LIST_SLICE, (list_st, sub_st -- res, ls, ss)) {
        res = sym_new_type(ctx, &PyList_Type);
        ls = list_st;
        ss = sub_st;
    }

    op(_TO_BOOL, (value -- res)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &res, false);
        if (!already_bool) {
            res = sym_new_truthiness(ctx, value, true);
        }
    }

    op(_TO_BOOL_BOOL, (value -- value)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &value, false);
        if (!already_bool) {
            sym_set_type(value, &PyBool_Type);
        }
    }

    op(_TO_BOOL_INT, (value -- res, v)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &res, true);
        if (!already_bool) {
            sym_set_type(value, &PyLong_Type);
            res = sym_new_truthiness(ctx, value, true);
        }
        v = value;
    }

    op(_TO_BOOL_LIST, (value -- res, v)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &res, true);
        if (!already_bool) {
            res = sym_new_type(ctx, &PyBool_Type);
        }
        v = value;
    }

    op(_TO_BOOL_NONE, (value -- res)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &res, false);
        if (!already_bool) {
            sym_set_const(value, Py_None);
            res = sym_new_const(ctx, Py_False);
        }
    }

    op(_GUARD_NOS_UNICODE, (nos, unused -- nos, unused)) {
        if (sym_matches_type(nos, &PyUnicode_Type)) {
            ADD_OP(_NOP, 0, 0);
        }
        sym_set_type(nos, &PyUnicode_Type);
    }

    op(_GUARD_NOS_COMPACT_ASCII, (nos, unused -- nos, unused)) {
        sym_set_type(nos, &PyUnicode_Type);
    }

    op(_GUARD_TOS_UNICODE, (value -- value)) {
        if (sym_matches_type(value, &PyUnicode_Type)) {
            ADD_OP(_NOP, 0, 0);
        }
        sym_set_type(value, &PyUnicode_Type);
    }

    op(_TO_BOOL_STR, (value -- res, v)) {
        int already_bool = optimize_to_bool(this_instr, ctx, value, &res, true);
        v = value;
        if (!already_bool) {
            res = sym_new_truthiness(ctx, value, true);
        }
    }

    op(_UNARY_NOT, (value -- res)) {
        REPLACE_OPCODE_IF_EVALUATES_PURE(value, res);
        sym_set_type(value, &PyBool_Type);
        res = sym_new_truthiness(ctx, value, false);
    }

    op(_UNARY_NEGATIVE, (value -- res, v)) {
        v = value;
        REPLACE_OPCODE_IF_EVALUATES_PURE(value, res);
        if (sym_matches_type(value, &PyFloat_Type) && PyJitRef_IsUnique(value)) {
            ADD_OP(_UNARY_NEGATIVE_FLOAT_INPLACE, 0, 0);
            v = PyJitRef_Borrow(sym_new_null(ctx));
            res = PyJitRef_MakeUnique(sym_new_type(ctx, &PyFloat_Type));
        }
        else if (sym_is_compact_int(value)) {
            res = sym_new_compact_int(ctx);
        }
        else {
            PyTypeObject *type = sym_get_type(value);
            if (type == &PyLong_Type || type == &PyFloat_Type) {
                res = sym_new_type(ctx, type);
            }
            else {
                res = sym_new_not_null(ctx);
            }
        }
    }

    op(_UNARY_INVERT, (value -- res, v)) {
        v = value;
        // Required to avoid a warning due to the deprecation of bitwise inversion of bools
        if (!sym_matches_type(value, &PyBool_Type)) {
            REPLACE_OPCODE_IF_EVALUATES_PURE(value, res);
        }
        if (sym_matches_type(value, &PyLong_Type)) {
            res = sym_new_type(ctx, &PyLong_Type);
        }
        else {
            res = sym_new_not_null(ctx);
        }
    }

    op(_COMPARE_OP, (left, right -- res)) {
        // Comparison between bytes and str or int is not impacted by this optimization as bytes
        // is not a safe type (due to its ability to raise a warning during comparisons).
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
        if (oparg & 16) {
            res = sym_new_type(ctx, &PyBool_Type);
        }
        else {
            res = _Py_uop_sym_new_not_null(ctx);
        }
    }

    op(_COMPARE_OP_INT, (left, right -- res, l, r)) {
        int cmp_mask = oparg & (COMPARE_LT_MASK | COMPARE_GT_MASK | COMPARE_EQ_MASK);

        if (cmp_mask == COMPARE_EQ_MASK) {
            res = sym_new_predicate(ctx, left, right, JIT_PRED_EQ);
        }
        else if (cmp_mask == (COMPARE_LT_MASK | COMPARE_GT_MASK)) {
            res = sym_new_predicate(ctx, left, right, JIT_PRED_NE);
        }
        else {
            res = sym_new_type(ctx, &PyBool_Type);
        }
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_COMPARE_OP_FLOAT, (left, right -- res, l, r)) {
        int cmp_mask = oparg & (COMPARE_LT_MASK | COMPARE_GT_MASK | COMPARE_EQ_MASK);

        if (cmp_mask == COMPARE_EQ_MASK) {
            res = sym_new_predicate(ctx, left, right, JIT_PRED_EQ);
        }
        else if (cmp_mask == (COMPARE_LT_MASK | COMPARE_GT_MASK)) {
            res = sym_new_predicate(ctx, left, right, JIT_PRED_NE);
        }
        else {
            res = sym_new_type(ctx, &PyBool_Type);
        }
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_COMPARE_OP_STR, (left, right -- res, l, r)) {
        /* Cannot use predicate optimization here, as `a == b`
         * does not imply that `a` is equivalent to `b`. `a` may be
         * mortal, while `b` is immortal */
        res = sym_new_type(ctx, &PyBool_Type);
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, res);
    }

    op(_IS_OP, (left, right -- b, l, r)) {
        b = sym_new_predicate(ctx, left, right, (oparg ? JIT_PRED_IS_NOT : JIT_PRED_IS));
        l = left;
        r = right;
    }

    op(_CONTAINS_OP, (left, right -- b, l, r)) {
        b = sym_new_type(ctx, &PyBool_Type);
        l = left;
        r = right;
        REPLACE_OPCODE_IF_EVALUATES_PURE(left, right, b);
    }

    op(_CONTAINS_OP_SET, (left, right -- b, l, r)) {
        b = sym_new_type(ctx, &PyBool_Type);
        l = left;
        r = right;
    }

    op(_CONTAINS_OP_DICT, (left, right -- b, l, r)) {
        b = sym_new_type(ctx, &PyBool_Type);
        l = left;
        r = right;
    }

    op(_LOAD_CONST, (-- value)) {
        PyCodeObject *co = get_current_code_object(ctx);
        PyObject *val = PyTuple_GET_ITEM(co->co_consts, oparg);
        ADD_OP(_LOAD_CONST_INLINE_BORROW, 0, (uintptr_t)val);
        value = PyJitRef_Borrow(sym_new_const(ctx, val));
    }

    op(_LOAD_COMMON_CONSTANT, (-- value)) {
        assert(oparg < NUM_COMMON_CONSTANTS);
        PyObject *val = _PyInterpreterState_GET()->common_consts[oparg];
        ADD_OP(_LOAD_CONST_INLINE_BORROW, 0, (uintptr_t)val);
        value = PyJitRef_Borrow(sym_new_const(ctx, val));
    }

    op(_LOAD_SMALL_INT, (-- value)) {
        PyObject *val = PyLong_FromLong(oparg);
        assert(val);
        assert(_Py_IsImmortal(val));
        ADD_OP(_LOAD_CONST_INLINE_BORROW, 0, (uintptr_t)val);
        value = PyJitRef_Borrow(sym_new_const(ctx, val));
    }

    op(_LOAD_CONST_INLINE, (ptr/4 -- value)) {
        value = sym_new_const(ctx, ptr);
    }

    op(_LOAD_CONST_INLINE_BORROW, (ptr/4 -- value)) {
        value = PyJitRef_Borrow(sym_new_const(ctx, ptr));
    }

    op(_POP_TOP_LOAD_CONST_INLINE, (ptr/4, pop -- value)) {
        value = sym_new_const(ctx, ptr);
    }

    op(_POP_TOP_LOAD_CONST_INLINE_BORROW, (ptr/4, pop -- value)) {
        value = PyJitRef_Borrow(sym_new_const(ctx, ptr));
    }

    op(_POP_CALL_LOAD_CONST_INLINE_BORROW, (ptr/4, unused, unused -- value)) {
        value = PyJitRef_Borrow(sym_new_const(ctx, ptr));
    }

    op(_POP_CALL_TWO_LOAD_CONST_INLINE_BORROW, (ptr/4, unused, unused, unused, unused -- value)) {
        value = PyJitRef_Borrow(sym_new_const(ctx, ptr));
    }

    op(_SHUFFLE_2_LOAD_CONST_INLINE_BORROW, (ptr/4, unused, unused, arg -- res, a)) {
        res = PyJitRef_Borrow(sym_new_const(ctx, ptr));
        a = arg;
    }

    op(_POP_TOP, (value -- )) {
        PyTypeObject *typ = sym_get_type(value);
        if (PyJitRef_IsBorrowed(value) ||
            sym_is_immortal(PyJitRef_Unwrap(value)) ||
            sym_is_null(value)) {
            ADD_OP(_POP_TOP_NOP, 0, 0);
        }
        else if (typ == &PyLong_Type) {
            ADD_OP(_POP_TOP_INT, 0, 0);
        }
        else if (typ == &PyFloat_Type) {
            ADD_OP(_POP_TOP_FLOAT, 0, 0);
        }
        else if (typ == &PyUnicode_Type) {
            ADD_OP(_POP_TOP_UNICODE, 0, 0);
        }
    }

    op(_POP_TOP_INT, (value --)) {
        if (PyJitRef_IsBorrowed(value)) {
            ADD_OP(_POP_TOP_NOP, 0, 0);
        }
    }

    op(_POP_TOP_FLOAT, (value --)) {
        if (PyJitRef_IsBorrowed(value)) {
            ADD_OP(_POP_TOP_NOP, 0, 0);
        }
    }

    op(_POP_TOP_UNICODE, (value --)) {
        if (PyJitRef_IsBorrowed(value)) {
            ADD_OP(_POP_TOP_NOP, 0, 0);
        }
    }

    op(_COPY, (bottom, unused[oparg-1] -- bottom, unused[oparg-1], top)) {
        assert(oparg > 0);
        bottom = PyJitRef_RemoveUnique(bottom);
        top = bottom;
    }

    op(_SWAP, (bottom, unused[oparg-2], top -- bottom, unused[oparg-2], top)) {
        JitOptRef temp = bottom;
        bottom = top;
        top = temp;
        assert(oparg >= 2);
    }

    op(_LOAD_ATTR_INSTANCE_VALUE, (offset/1, owner -- attr, o)) {
        attr = sym_new_not_null(ctx);
        (void)offset;
        o = owner;
    }

    op(_LOAD_ATTR_MODULE, (dict_version/2, index/1, owner -- attr, o)) {
        (void)dict_version;
        (void)index;
        attr = PyJitRef_NULL;
        if (sym_is_const(ctx, owner)) {
            PyModuleObject *mod = (PyModuleObject *)sym_get_const(ctx, owner);
            if (PyModule_CheckExact(mod)) {
                PyObject *dict = mod->md_dict;
                uint64_t watched_mutations = get_mutations(dict);
                if (watched_mutations < _Py_MAX_ALLOWED_GLOBALS_MODIFICATIONS) {
                    PyDict_Watch(GLOBALS_WATCHER_ID, dict);
                    _Py_BloomFilter_Add(dependencies, dict);
                    PyObject *res = convert_global_to_const(this_instr, dict, false, true);
                    if (res == NULL) {
                        attr = sym_new_not_null(ctx);
                    }
                    else {
                        attr = sym_new_const(ctx, res);
                    }

                }
            }
        }
        if (PyJitRef_IsNull(attr)) {
            /* No conversion made. We don't know what `attr` is. */
            attr = sym_new_not_null(ctx);
        }
        o = owner;
    }

    op (_PUSH_NULL_CONDITIONAL, ( -- null[oparg & 1])) {
        if (oparg & 1) {
            ADD_OP(_PUSH_NULL, 0, 0);
            null[0] = sym_new_null(ctx);
        }
        else {
            ADD_OP(_NOP, 0, 0);
        }
    }

    op(_LOAD_ATTR, (owner -- attr, self_or_null[oparg&1])) {
        (void)owner;
        attr = sym_new_not_null(ctx);
        if (oparg & 1) {
            self_or_null[0] = sym_new_unknown(ctx);
        }
    }

    op(_LOAD_ATTR_WITH_HINT, (hint/1, owner -- attr, o)) {
        attr = sym_new_not_null(ctx);
        (void)hint;
        o = owner;
    }

    op(_LOAD_ATTR_SLOT, (index/1, owner -- attr, o)) {
        attr = sym_new_not_null(ctx);
        (void)index;
        o = owner;
    }

    op(_LOAD_ATTR_CLASS, (descr/4, owner -- attr)) {
        (void)descr;
        PyTypeObject *type = (PyTypeObject *)sym_get_const(ctx, owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _POP_TOP_LOAD_CONST_INLINE_BORROW,
                           _POP_TOP_LOAD_CONST_INLINE);
    }

    op(_LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES, (descr/4, owner -- attr)) {
        (void)descr;
        PyTypeObject *type = sym_get_type(owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _POP_TOP_LOAD_CONST_INLINE_BORROW,
                           _POP_TOP_LOAD_CONST_INLINE);
    }

    op(_LOAD_ATTR_NONDESCRIPTOR_NO_DICT, (descr/4, owner -- attr)) {
        (void)descr;
        PyTypeObject *type = sym_get_type(owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _POP_TOP_LOAD_CONST_INLINE_BORROW,
                           _POP_TOP_LOAD_CONST_INLINE);
    }

    op(_LOAD_ATTR_METHOD_WITH_VALUES, (descr/4, owner -- attr, self)) {
        (void)descr;
        PyTypeObject *type = sym_get_type(owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _LOAD_CONST_UNDER_INLINE_BORROW,
                           _LOAD_CONST_UNDER_INLINE);
        self = owner;
    }

    op(_LOAD_ATTR_METHOD_NO_DICT, (descr/4, owner -- attr, self)) {
        (void)descr;
        PyTypeObject *type = sym_get_type(owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _LOAD_CONST_UNDER_INLINE_BORROW,
                           _LOAD_CONST_UNDER_INLINE);
        self = owner;
    }

    op(_LOAD_ATTR_METHOD_LAZY_DICT, (descr/4, owner -- attr, self)) {
        (void)descr;
        PyTypeObject *type = sym_get_type(owner);
        PyObject *name = get_co_name(ctx, oparg >> 1);
        attr = lookup_attr(ctx, dependencies, this_instr, type, name,
                           _LOAD_CONST_UNDER_INLINE_BORROW,
                           _LOAD_CONST_UNDER_INLINE);
        self = owner;
    }

    op(_LOAD_ATTR_PROPERTY_FRAME, (fget/4, owner -- new_frame)) {
        // + 1 for _SAVE_RETURN_OFFSET
        // FIX ME -- This needs a version check and function watcher
        PyCodeObject *co = (PyCodeObject *)((PyFunctionObject *)fget)->func_code;
        _Py_UOpsAbstractFrame *f = frame_new(ctx, co, NULL, 0);
        if (f == NULL) {
            break;
        }
        f->locals[0] = owner;
        new_frame = PyJitRef_WrapInvalid(f);
    }

    op(_INIT_CALL_BOUND_METHOD_EXACT_ARGS, (callable, self_or_null, unused[oparg] -- callable, self_or_null, unused[oparg])) {
        callable = sym_new_not_null(ctx);
        self_or_null = sym_new_not_null(ctx);
    }

    op(_CHECK_FUNCTION_VERSION, (func_version/2, callable, self_or_null, unused[oparg] -- callable, self_or_null, unused[oparg])) {
        if (sym_get_func_version(callable) == func_version) {
            REPLACE_OP(this_instr, _NOP, 0, 0);
        }
        else {
            sym_set_func_version(ctx, callable, func_version);
        }
    }

    op(_CHECK_METHOD_VERSION, (func_version/2, callable, null, unused[oparg] -- callable, null, unused[oparg])) {
        if (sym_is_const(ctx, callable) && sym_matches_type(callable, &PyMethod_Type)) {
            PyMethodObject *method = (PyMethodObject *)sym_get_const(ctx, callable);
            assert(PyMethod_Check(method));
            ADD_OP(_CHECK_FUNCTION_VERSION_INLINE, 0, func_version);
            uop_buffer_last(&ctx->out_buffer)->operand1 = (uintptr_t)method->im_func;
        }
        sym_set_type(callable, &PyMethod_Type);
    }

    op(_CHECK_FUNCTION_EXACT_ARGS, (callable, self_or_null, unused[oparg] -- callable, self_or_null, unused[oparg])) {
        assert(sym_matches_type(callable, &PyFunction_Type));
        if (sym_is_const(ctx, callable)) {
            if (sym_is_null(self_or_null) || sym_is_not_null(self_or_null)) {
                PyFunctionObject *func = (PyFunctionObject *)sym_get_const(ctx, callable);
                PyCodeObject *co = (PyCodeObject *)func->func_code;
                if (co->co_argcount == oparg + !sym_is_null(self_or_null)) {
                    ADD_OP(_NOP, 0 ,0);
                }
            }
        }
    }

    op(_CHECK_CALL_BOUND_METHOD_EXACT_ARGS, (callable, null, unused[oparg] -- callable, null, unused[oparg])) {
        sym_set_null(null);
        sym_set_type(callable, &PyMethod_Type);
    }

    op(_INIT_CALL_PY_EXACT_ARGS, (callable, self_or_null, args[oparg] -- new_frame)) {
        int argcount = oparg;
        assert(!PyJitRef_IsNull(self_or_null));
        assert(args != NULL);
        if (sym_is_not_null(self_or_null)) {
            // Bound method fiddling, same as _INIT_CALL_PY_EXACT_ARGS in VM
            args--;
            argcount++;
        }

        if (sym_is_null(self_or_null) || sym_is_not_null(self_or_null)) {
            new_frame = PyJitRef_WrapInvalid(frame_new_from_symbol(ctx, callable, args, argcount));
        } else {
            new_frame = PyJitRef_WrapInvalid(frame_new_from_symbol(ctx, callable, NULL, 0));
        }
    }

    op(_MAYBE_EXPAND_METHOD, (callable, self_or_null, args[oparg] -- callable, self_or_null, args[oparg])) {
        (void)args;
        callable = sym_new_not_null(ctx);
        self_or_null = sym_new_not_null(ctx);
    }

    op(_PY_FRAME_GENERAL, (callable, self_or_null, args[oparg] -- new_frame)) {
        new_frame = PyJitRef_WrapInvalid(frame_new_from_symbol(ctx, callable, NULL, 0));
    }

    op(_PY_FRAME_KW, (callable, self_or_null, args[oparg], kwnames -- new_frame)) {
        new_frame = PyJitRef_WrapInvalid(frame_new_from_symbol(ctx, callable, NULL, 0));
    }

    op(_PY_FRAME_EX, (func_st, null, callargs_st, kwargs_st -- ex_frame)) {
        ex_frame = PyJitRef_WrapInvalid(frame_new_from_symbol(ctx, func_st, NULL, 0));
    }

    op(_CHECK_AND_ALLOCATE_OBJECT, (type_version/2, callable, self_or_null, args[oparg] -- callable, self_or_null, args[oparg])) {
        (void)type_version;
        (void)args;
        callable = sym_new_not_null(ctx);
        self_or_null = sym_new_not_null(ctx);