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gh-148211: decompose `_POP_TOP_LOAD_CONST_INLINE(_BORROW)` in JIT by NekoAsakura · Pull Request #148230 · python/cpython · GitHub

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gh-148211: decompose _POP_TOP_LOAD_CONST_INLINE(_BORROW) in JIT #148230

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Merged
Fidget-Spinner merged 4 commits into from
Apr 8, 2026
Conversation 9 Commits 4 Checks 76 Files changed
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gh-148211: decompose _POP_TOP_LOAD_CONST_INLINE(_BORROW) in JIT #148230

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gh-148211: decompose `_POP_TOP_LOAD_CONST_INLINE(_BORROW)` in JIT
NekoAsakura Apr 7, 2026
81d854d
Merge branch 'main' into gh-148211/decompose-pop-top
NekoAsakura Apr 8, 2026
a8abce8
Merge branch 'main' into gh-148211/decompose-pop-top
NekoAsakura Apr 8, 2026
d6e454a
gh-148211: decompose `_POP_TOP_LOAD_CONST_INLINE(_BORROW)` in JIT
NekoAsakura Apr 8, 2026
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8 changes: 4 additions & 4 deletions Lib/test/test_capi/test_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1470,8 +1470,8 @@ class Bar:
opnames = list(iter_opnames(ex))
self.assertEqual(res, TIER2_THRESHOLD * 2 + 2)
call = opnames.index("_CALL_BUILTIN_FAST")
load_attr_top = opnames.index("_POP_TOP_LOAD_CONST_INLINE_BORROW", 0, call)
load_attr_bottom = opnames.index("_POP_TOP_LOAD_CONST_INLINE_BORROW", call)
load_attr_top = opnames.index("_LOAD_CONST_INLINE_BORROW", 0, call)
load_attr_bottom = opnames.index("_LOAD_CONST_INLINE_BORROW", call)
self.assertEqual(opnames[:load_attr_top].count("_GUARD_TYPE_VERSION"), 1)
self.assertEqual(opnames[call:load_attr_bottom].count("_CHECK_VALIDITY"), 2)

Expand All @@ -1493,8 +1493,8 @@ class Foo:
self.assertIsNotNone(ex)
self.assertEqual(res, TIER2_THRESHOLD * 2)
call = opnames.index("_CALL_BUILTIN_FAST_WITH_KEYWORDS")
load_attr_top = opnames.index("_POP_TOP_LOAD_CONST_INLINE_BORROW", 0, call)
load_attr_bottom = opnames.index("_POP_TOP_LOAD_CONST_INLINE_BORROW", call)
load_attr_top = opnames.index("_LOAD_CONST_INLINE_BORROW", 0, call)
load_attr_bottom = opnames.index("_LOAD_CONST_INLINE_BORROW", call)
self.assertEqual(opnames[:load_attr_top].count("_GUARD_TYPE_VERSION"), 1)
self.assertEqual(opnames[call:load_attr_bottom].count("_CHECK_VALIDITY"), 2)

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33 changes: 19 additions & 14 deletions Python/optimizer_analysis.c
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,7 @@ type_watcher_callback(PyTypeObject* type)
}

static PyObject *
convert_global_to_const(_PyUOpInstruction *inst, PyObject *obj, bool pop, bool insert)
convert_global_to_const(_PyUOpInstruction *inst, PyObject *obj, bool insert)
{
assert(inst->opcode == _LOAD_GLOBAL_MODULE || inst->opcode == _LOAD_GLOBAL_BUILTINS || inst->opcode == _LOAD_ATTR_MODULE);
assert(PyDict_CheckExact(obj));
Expand Down Expand Up @@ -183,9 +183,9 @@ convert_global_to_const(_PyUOpInstruction *inst, PyObject *obj, bool pop, bool i
}
} else {
if (_Py_IsImmortal(res)) {
inst->opcode = pop ? _POP_TOP_LOAD_CONST_INLINE_BORROW : _LOAD_CONST_INLINE_BORROW;
inst->opcode = _LOAD_CONST_INLINE_BORROW;
} else {
inst->opcode = pop ? _POP_TOP_LOAD_CONST_INLINE : _LOAD_CONST_INLINE;
inst->opcode = _LOAD_CONST_INLINE;
}
if (inst->oparg & 1) {
assert(inst[1].opcode == _PUSH_NULL_CONDITIONAL);
Expand Down Expand Up @@ -340,10 +340,12 @@ optimize_to_bool(
int truthiness = sym_truthiness(ctx, value);
if (truthiness >= 0) {
PyObject *load = truthiness ? Py_True : Py_False;
int opcode = insert_mode ?
_INSERT_1_LOAD_CONST_INLINE_BORROW :
_POP_TOP_LOAD_CONST_INLINE_BORROW;
ADD_OP(opcode, 0, (uintptr_t)load);
if (insert_mode) {
ADD_OP(_INSERT_1_LOAD_CONST_INLINE_BORROW, 0, (uintptr_t)load);
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} else {
ADD_OP(_POP_TOP, 0, 0);
ADD_OP(_LOAD_CONST_INLINE_BORROW, 0, (uintptr_t)load);
}
*result_ptr = sym_new_const(ctx, load);
return 1;
}
Expand Down Expand Up @@ -389,19 +391,22 @@ eliminate_pop_guard(_PyUOpInstruction *this_instr, JitOptContext *ctx, bool exit

static JitOptRef
lookup_attr(JitOptContext *ctx, _PyBloomFilter *dependencies, _PyUOpInstruction *this_instr,
PyTypeObject *type, PyObject *name, uint16_t immortal,
uint16_t mortal)
PyTypeObject *type, PyObject *name, bool pop)
{
// The cached value may be dead, so we need to do the lookup again... :(
if (type && PyType_Check(type)) {
PyObject *lookup = _PyType_Lookup(type, name);
if (lookup) {
int opcode = mortal;
// if the object is immortal or the type is immutable, borrowing is safe
if (_Py_IsImmortal(lookup) || (type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE)) {
opcode = immortal;
bool immortal = _Py_IsImmortal(lookup) || (type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE);
if (pop) {
ADD_OP(_POP_TOP, 0, 0);
ADD_OP(immortal ? _LOAD_CONST_INLINE_BORROW : _LOAD_CONST_INLINE,
0, (uintptr_t)lookup);
}
else {
ADD_OP(immortal ? _INSERT_1_LOAD_CONST_INLINE_BORROW : _INSERT_1_LOAD_CONST_INLINE,
0, (uintptr_t)lookup);
}
ADD_OP(opcode, 0, (uintptr_t)lookup);
PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
_Py_BloomFilter_Add(dependencies, type);
return sym_new_const(ctx, lookup);
Expand Down
32 changes: 9 additions & 23 deletions Python/optimizer_bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -757,14 +757,6 @@ dummy_func(void) {
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));
}
Expand Down Expand Up @@ -845,7 +837,7 @@ dummy_func(void) {
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);
PyObject *res = convert_global_to_const(this_instr, dict, true);
if (res == NULL) {
attr = sym_new_not_null(ctx);
}
Expand Down Expand Up @@ -898,35 +890,31 @@ dummy_func(void) {
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);
true);
}

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);
true);
}

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);
true);
}

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,
_INSERT_1_LOAD_CONST_INLINE_BORROW,
_INSERT_1_LOAD_CONST_INLINE);
false);
self = owner;
}

Expand All @@ -935,8 +923,7 @@ dummy_func(void) {
PyTypeObject *type = sym_get_type(owner);
PyObject *name = get_co_name(ctx, oparg >> 1);
attr = lookup_attr(ctx, dependencies, this_instr, type, name,
_INSERT_1_LOAD_CONST_INLINE_BORROW,
_INSERT_1_LOAD_CONST_INLINE);
false);
self = owner;
}

Expand All @@ -945,8 +932,7 @@ dummy_func(void) {
PyTypeObject *type = sym_get_type(owner);
PyObject *name = get_co_name(ctx, oparg >> 1);
attr = lookup_attr(ctx, dependencies, this_instr, type, name,
_INSERT_1_LOAD_CONST_INLINE_BORROW,
_INSERT_1_LOAD_CONST_INLINE);
false);
self = owner;
}

Expand Down Expand Up @@ -2010,7 +1996,7 @@ dummy_func(void) {
ctx->builtins_watched = true;
}
if (ctx->frame->globals_checked_version != 0 && ctx->frame->globals_watched) {
cnst = convert_global_to_const(this_instr, builtins, false, false);
cnst = convert_global_to_const(this_instr, builtins, false);
}
}
if (cnst == NULL) {
Expand Down Expand Up @@ -2049,7 +2035,7 @@ dummy_func(void) {
ctx->frame->globals_checked_version = version;
}
if (ctx->frame->globals_checked_version == version) {
cnst = convert_global_to_const(this_instr, globals, false, false);
cnst = convert_global_to_const(this_instr, globals, false);
}
}
}
Expand Down
35 changes: 14 additions & 21 deletions Python/optimizer_cases.c.h
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25 changes: 16 additions & 9 deletions Tools/cases_generator/optimizer_generator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -238,18 +238,23 @@ def replace_opcode_if_evaluates_pure(
# Map input count to output index (from TOS) and the appropriate constant-loading uop
input_count_to_uop = {
1: {
# (a -- a), usually for unary ops
0: "_POP_TOP_LOAD_CONST_INLINE_BORROW",
# (a -- res), usually for unary ops
0: [("_POP_TOP", "0, 0"),
("_LOAD_CONST_INLINE_BORROW",
"0, (uintptr_t)result")],
# (left -- res, left)
# usually for unary ops with passthrough references
1: "_INSERT_1_LOAD_CONST_INLINE_BORROW",
1: [("_INSERT_1_LOAD_CONST_INLINE_BORROW",
"0, (uintptr_t)result")],
},
2: {
# (a. b -- res), usually for binary ops
0: "_POP_TWO_LOAD_CONST_INLINE_BORROW",
# (a, b -- res), usually for binary ops
0: [("_POP_TWO_LOAD_CONST_INLINE_BORROW",
"0, (uintptr_t)result")],
# (left, right -- res, left, right)
# usually for binary ops with passthrough references
2: "_INSERT_2_LOAD_CONST_INLINE_BORROW",
2: [("_INSERT_2_LOAD_CONST_INLINE_BORROW",
"0, (uintptr_t)result")],
},
}

Expand All @@ -263,14 +268,16 @@ def replace_opcode_if_evaluates_pure(
assert output_index >= 0
input_count = len(used_stack_inputs)
if input_count in input_count_to_uop and output_index in input_count_to_uop[input_count]:
replacement_uop = input_count_to_uop[input_count][output_index]
ops = input_count_to_uop[input_count][output_index]
input_desc = "one input" if input_count == 1 else "two inputs"
ops_desc = " + ".join(op for op, _ in ops)

emitter.emit(f"if (sym_is_const(ctx, {output_identifier.text})) {{\n")
emitter.emit(f"PyObject *result = sym_get_const(ctx, {output_identifier.text});\n")
emitter.emit(f"if (_Py_IsImmortal(result)) {{\n")
emitter.emit(f"// Replace with {replacement_uop} since we have {input_desc} and an immortal result\n")
emitter.emit(f"ADD_OP({replacement_uop}, 0, (uintptr_t)result);\n")
emitter.emit(f"// Replace with {ops_desc} since we have {input_desc} and an immortal result\n")
for op, args in ops:
emitter.emit(f"ADD_OP({op}, {args});\n")
emitter.emit("}\n")
emitter.emit("}\n")

Expand Down
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