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bpo-44945: Specialize BINARY_ADD (GH-27967)

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Mark Shannon 2021-08-27 09:21:01 +01:00 • committed by GitHub
parent 245f1f2605
commit d3eaf0cc5b
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9 changed files with 253 additions and 78 deletions
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129
Python/ceval.c
View file

@ -1435,6 +1435,12 @@ eval_frame_handle_pending(PyThreadState *tstate)
#define UPDATE_PREV_INSTR_OPARG(instr, oparg) ((uint8_t*)(instr))[-1] = (oparg)
static inline void
record_hit_inline(_Py_CODEUNIT *next_instr, int oparg)
{
UPDATE_PREV_INSTR_OPARG(next_instr, saturating_increment(oparg));
}
#define GLOBALS() frame->f_globals
#define BUILTINS() frame->f_builtins
#define LOCALS() frame->f_locals
@ -1980,28 +1986,120 @@ check_eval_breaker:
}
TARGET(BINARY_ADD): {
PREDICTED(BINARY_ADD);
STAT_INC(BINARY_ADD, unquickened);
PyObject *right = POP();
PyObject *left = TOP();
PyObject *sum;
/* NOTE(vstinner): Please don't try to micro-optimize int+int on
CPython using bytecode, it is simply worthless.
See http://bugs.python.org/issue21955 and
http://bugs.python.org/issue10044 for the discussion. In short,
no patch shown any impact on a realistic benchmark, only a minor
speedup on microbenchmarks. */
if (PyUnicode_CheckExact(left) &&
PyUnicode_CheckExact(right)) {
sum = unicode_concatenate(tstate, left, right, frame, next_instr);
/* unicode_concatenate consumed the ref to left */
PyObject *sum = PyNumber_Add(left, right);
SET_TOP(sum);
Py_DECREF(left);
Py_DECREF(right);
if (sum == NULL) {
goto error;
}
DISPATCH();
}
TARGET(BINARY_ADD_ADAPTIVE): {
if (oparg == 0) {
PyObject *left = SECOND();
PyObject *right = TOP();
next_instr--;
if (_Py_Specialize_BinaryAdd(left, right, next_instr) < 0) {
goto error;
}
DISPATCH();
}
else {
sum = PyNumber_Add(left, right);
Py_DECREF(left);
STAT_INC(BINARY_ADD, deferred);
UPDATE_PREV_INSTR_OPARG(next_instr, oparg - 1);
STAT_DEC(BINARY_ADD, unquickened);
JUMP_TO_INSTRUCTION(BINARY_ADD);
}
}
TARGET(BINARY_ADD_UNICODE): {
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyUnicode_CheckExact(left), BINARY_ADD);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_ADD);
STAT_INC(BINARY_ADD, hit);
record_hit_inline(next_instr, oparg);
PyObject *res = PyUnicode_Concat(left, right);
STACK_SHRINK(1);
SET_TOP(res);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(sum);
if (sum == NULL)
if (TOP() == NULL) {
goto error;
}
DISPATCH();
}
TARGET(BINARY_ADD_UNICODE_INPLACE_FAST): {
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyUnicode_CheckExact(left), BINARY_ADD);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_ADD);
DEOPT_IF(Py_REFCNT(left) != 2, BINARY_ADD);
int next_oparg = _Py_OPARG(*next_instr);
assert(_Py_OPCODE(*next_instr) == STORE_FAST);
/* In the common case, there are 2 references to the value
* stored in 'variable' when the v = v + ... is performed: one
* on the value stack (in 'v') and one still stored in the
* 'variable'. We try to delete the variable now to reduce
* the refcnt to 1.
*/
PyObject *var = GETLOCAL(next_oparg);
DEOPT_IF(var != left, BINARY_ADD);
STAT_INC(BINARY_ADD, hit);
record_hit_inline(next_instr, oparg);
GETLOCAL(next_oparg) = NULL;
Py_DECREF(left);
STACK_SHRINK(1);
PyUnicode_Append(&TOP(), right);
Py_DECREF(right);
if (TOP() == NULL) {
goto error;
}
DISPATCH();
}
TARGET(BINARY_ADD_FLOAT): {
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyFloat_CheckExact(left), BINARY_ADD);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_ADD);
STAT_INC(BINARY_ADD, hit);
record_hit_inline(next_instr, oparg);
double dsum = ((PyFloatObject *)left)->ob_fval +
((PyFloatObject *)right)->ob_fval;
PyObject *sum = PyFloat_FromDouble(dsum);
SET_SECOND(sum);
Py_DECREF(right);
Py_DECREF(left);
STACK_SHRINK(1);
if (sum == NULL) {
goto error;
}
DISPATCH();
}
TARGET(BINARY_ADD_INT): {
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyLong_CheckExact(left), BINARY_ADD);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_ADD);
STAT_INC(BINARY_ADD, hit);
record_hit_inline(next_instr, oparg);
PyObject *sum = _PyLong_Add((PyLongObject *)left, (PyLongObject *)right);
SET_SECOND(sum);
Py_DECREF(right);
Py_DECREF(left);
STACK_SHRINK(1);
if (sum == NULL) {
goto error;
}
DISPATCH();
}
@ -4761,6 +4859,7 @@ MISS_WITH_CACHE(STORE_ATTR)
MISS_WITH_CACHE(LOAD_GLOBAL)
MISS_WITH_CACHE(LOAD_METHOD)
MISS_WITH_OPARG_COUNTER(BINARY_SUBSCR)
MISS_WITH_OPARG_COUNTER(BINARY_ADD)
binary_subscr_dict_error:
{

50
Python/opcode_targets.h generated
View file

@ -6,21 +6,21 @@ static void *opcode_targets[256] = {
&&TARGET_DUP_TOP,
&&TARGET_DUP_TOP_TWO,
&&TARGET_ROT_FOUR,
&&TARGET_BINARY_SUBSCR_ADAPTIVE,
&&TARGET_BINARY_SUBSCR_LIST_INT,
&&TARGET_BINARY_ADD_ADAPTIVE,
&&TARGET_BINARY_ADD_INT,
&&TARGET_NOP,
&&TARGET_UNARY_POSITIVE,
&&TARGET_UNARY_NEGATIVE,
&&TARGET_UNARY_NOT,
&&TARGET_BINARY_SUBSCR_TUPLE_INT,
&&TARGET_BINARY_SUBSCR_DICT,
&&TARGET_BINARY_ADD_FLOAT,
&&TARGET_BINARY_ADD_UNICODE,
&&TARGET_UNARY_INVERT,
&&TARGET_BINARY_MATRIX_MULTIPLY,
&&TARGET_INPLACE_MATRIX_MULTIPLY,
&&TARGET_JUMP_ABSOLUTE_QUICK,
&&TARGET_BINARY_ADD_UNICODE_INPLACE_FAST,
&&TARGET_BINARY_POWER,
&&TARGET_BINARY_MULTIPLY,
&&TARGET_LOAD_ATTR_ADAPTIVE,
&&TARGET_BINARY_SUBSCR_ADAPTIVE,
&&TARGET_BINARY_MODULO,
&&TARGET_BINARY_ADD,
&&TARGET_BINARY_SUBTRACT,
@ -35,19 +35,19 @@ static void *opcode_targets[256] = {
&&TARGET_MATCH_KEYS,
&&TARGET_COPY_DICT_WITHOUT_KEYS,
&&TARGET_PUSH_EXC_INFO,
&&TARGET_LOAD_ATTR_SPLIT_KEYS,
&&TARGET_BINARY_SUBSCR_LIST_INT,
&&TARGET_POP_EXCEPT_AND_RERAISE,
&&TARGET_BINARY_SUBSCR_TUPLE_INT,
&&TARGET_BINARY_SUBSCR_DICT,
&&TARGET_JUMP_ABSOLUTE_QUICK,
&&TARGET_LOAD_ATTR_ADAPTIVE,
&&TARGET_LOAD_ATTR_SPLIT_KEYS,
&&TARGET_LOAD_ATTR_WITH_HINT,
&&TARGET_LOAD_ATTR_SLOT,
&&TARGET_LOAD_ATTR_MODULE,
&&TARGET_LOAD_GLOBAL_ADAPTIVE,
&&TARGET_LOAD_GLOBAL_MODULE,
&&TARGET_LOAD_GLOBAL_BUILTIN,
&&TARGET_LOAD_METHOD_ADAPTIVE,
&&TARGET_LOAD_METHOD_CACHED,
&&TARGET_LOAD_METHOD_CLASS,
&&TARGET_LOAD_METHOD_MODULE,
&&TARGET_STORE_ATTR_ADAPTIVE,
&&TARGET_WITH_EXCEPT_START,
&&TARGET_GET_AITER,
&&TARGET_GET_ANEXT,
@ -57,7 +57,7 @@ static void *opcode_targets[256] = {
&&TARGET_INPLACE_ADD,
&&TARGET_INPLACE_SUBTRACT,
&&TARGET_INPLACE_MULTIPLY,
&&TARGET_STORE_ATTR_SPLIT_KEYS,
&&TARGET_LOAD_METHOD_ADAPTIVE,
&&TARGET_INPLACE_MODULO,
&&TARGET_STORE_SUBSCR,
&&TARGET_DELETE_SUBSCR,
@ -79,15 +79,15 @@ static void *opcode_targets[256] = {
&&TARGET_INPLACE_AND,
&&TARGET_INPLACE_XOR,
&&TARGET_INPLACE_OR,
&&TARGET_STORE_ATTR_SLOT,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_LOAD_METHOD_CACHED,
&&TARGET_LOAD_METHOD_CLASS,
&&TARGET_LIST_TO_TUPLE,
&&TARGET_RETURN_VALUE,
&&TARGET_IMPORT_STAR,
&&TARGET_SETUP_ANNOTATIONS,
&&TARGET_YIELD_VALUE,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_LOAD_METHOD_MODULE,
&&TARGET_STORE_ATTR_ADAPTIVE,
&&TARGET_POP_EXCEPT,
&&TARGET_STORE_NAME,
&&TARGET_DELETE_NAME,
@ -119,30 +119,30 @@ static void *opcode_targets[256] = {
&&TARGET_IS_OP,
&&TARGET_CONTAINS_OP,
&&TARGET_RERAISE,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_STORE_ATTR_SPLIT_KEYS,
&&TARGET_JUMP_IF_NOT_EXC_MATCH,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_STORE_FAST__STORE_FAST,
&&TARGET_STORE_ATTR_SLOT,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_LOAD_FAST,
&&TARGET_STORE_FAST,
&&TARGET_DELETE_FAST,
&&_unknown_opcode,
&&_unknown_opcode,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_GEN_START,
&&TARGET_RAISE_VARARGS,
&&TARGET_CALL_FUNCTION,
&&TARGET_MAKE_FUNCTION,
&&TARGET_BUILD_SLICE,
&&_unknown_opcode,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_MAKE_CELL,
&&TARGET_LOAD_CLOSURE,
&&TARGET_LOAD_DEREF,
&&TARGET_STORE_DEREF,
&&TARGET_DELETE_DEREF,
&&_unknown_opcode,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_CALL_FUNCTION_KW,
&&TARGET_CALL_FUNCTION_EX,
&&_unknown_opcode,
&&TARGET_STORE_FAST__STORE_FAST,
&&TARGET_EXTENDED_ARG,
&&TARGET_LIST_APPEND,
&&TARGET_SET_ADD,

62
Python/specialize.c
View file

@ -121,7 +121,8 @@ _Py_GetSpecializationStats(void) {
int err = 0;
err += add_stat_dict(stats, LOAD_ATTR, "load_attr");
err += add_stat_dict(stats, LOAD_GLOBAL, "load_global");
err += add_stat_dict(stats, LOAD_GLOBAL, "load_method");
err += add_stat_dict(stats, LOAD_METHOD, "load_method");
err += add_stat_dict(stats, BINARY_ADD, "binary_add");
err += add_stat_dict(stats, BINARY_SUBSCR, "binary_subscr");
err += add_stat_dict(stats, STORE_ATTR, "store_attr");
if (err < 0) {
@ -177,6 +178,7 @@ _Py_PrintSpecializationStats(void)
print_stats(out, &_specialization_stats[LOAD_ATTR], "load_attr");
print_stats(out, &_specialization_stats[LOAD_GLOBAL], "load_global");
print_stats(out, &_specialization_stats[LOAD_METHOD], "load_method");
print_stats(out, &_specialization_stats[BINARY_ADD], "binary_add");
print_stats(out, &_specialization_stats[BINARY_SUBSCR], "binary_subscr");
print_stats(out, &_specialization_stats[STORE_ATTR], "store_attr");
if (out != stderr) {
@ -226,6 +228,7 @@ static uint8_t adaptive_opcodes[256] = {
[LOAD_ATTR] = LOAD_ATTR_ADAPTIVE,
[LOAD_GLOBAL] = LOAD_GLOBAL_ADAPTIVE,
[LOAD_METHOD] = LOAD_METHOD_ADAPTIVE,
[BINARY_ADD] = BINARY_ADD_ADAPTIVE,
[BINARY_SUBSCR] = BINARY_SUBSCR_ADAPTIVE,
[STORE_ATTR] = STORE_ATTR_ADAPTIVE,
};
@ -235,6 +238,7 @@ static uint8_t cache_requirements[256] = {
[LOAD_ATTR] = 2, /* _PyAdaptiveEntry and _PyAttrCache */
[LOAD_GLOBAL] = 2, /* _PyAdaptiveEntry and _PyLoadGlobalCache */
[LOAD_METHOD] = 3, /* _PyAdaptiveEntry, _PyAttrCache and _PyObjectCache */
[BINARY_ADD] = 0,
[BINARY_SUBSCR] = 0,
[STORE_ATTR] = 2, /* _PyAdaptiveEntry and _PyAttrCache */
};
@ -436,6 +440,12 @@ _Py_Quicken(PyCodeObject *code) {
#define SPEC_FAIL_TUPLE_NON_INT_SUBSCRIPT 9
#define SPEC_FAIL_NOT_TUPLE_LIST_OR_DICT 10
/* Binary add */
#define SPEC_FAIL_NON_FUNCTION_SCOPE 11
#define SPEC_FAIL_DIFFERENT_TYPES 12
#define SPEC_FAIL_OTHER_TYPE 13
static int
specialize_module_load_attr(
@ -898,7 +908,7 @@ _Py_Specialize_LoadMethod(PyObject *owner, _Py_CODEUNIT *instr, PyObject *name,
SPECIALIZATION_FAIL(LOAD_METHOD, SPEC_FAIL_NOT_METHOD);
goto fail;
}
assert(kind == METHOD);
// If o.__dict__ changes, the method might be found in o.__dict__
// instead of old type lookup. So record o.__dict__'s keys.
@ -933,15 +943,15 @@ _Py_Specialize_LoadMethod(PyObject *owner, _Py_CODEUNIT *instr, PyObject *name,
}
// Fall through.
} // Else owner is maybe a builtin with no dict, or __slots__. Doesn't matter.
/* `descr` is borrowed. Just check tp_version_tag before accessing in case
* it's deleted. This is safe for methods (even inherited ones from super
* classes!) as long as tp_version_tag is validated for two main reasons:
*
*
* 1. The class will always hold a reference to the method so it will
* usually not be GC-ed. Should it be deleted in Python, e.g.
* `del obj.meth`, tp_version_tag will be invalidated, because of reason 2.
*
*
* 2. The pre-existing type method cache (MCACHE) uses the same principles
* of caching a borrowed descriptor. It does all the heavy lifting for us.
* E.g. it invalidates on any MRO modification, on any type object
@ -968,6 +978,7 @@ fail:
return 0;
}
int
_Py_Specialize_LoadGlobal(
PyObject *globals, PyObject *builtins,
@ -1035,7 +1046,6 @@ success:
return 0;
}
int
_Py_Specialize_BinarySubscr(
PyObject *container, PyObject *sub, _Py_CODEUNIT *instr)
@ -1076,3 +1086,43 @@ success:
return 0;
}
int
_Py_Specialize_BinaryAdd(PyObject *left, PyObject *right, _Py_CODEUNIT *instr)
{
PyTypeObject *left_type = Py_TYPE(left);
if (left_type != Py_TYPE(right)) {
SPECIALIZATION_FAIL(BINARY_ADD, SPEC_FAIL_DIFFERENT_TYPES);
goto fail;
}
if (left_type == &PyUnicode_Type) {
int next_opcode = _Py_OPCODE(instr[1]);
if (next_opcode == STORE_FAST) {
*instr = _Py_MAKECODEUNIT(BINARY_ADD_UNICODE_INPLACE_FAST, saturating_start());
}
else {
*instr = _Py_MAKECODEUNIT(BINARY_ADD_UNICODE, saturating_start());
}
goto success;
}
else if (left_type == &PyLong_Type) {
*instr = _Py_MAKECODEUNIT(BINARY_ADD_INT, saturating_start());
goto success;
}
else if (left_type == &PyFloat_Type) {
*instr = _Py_MAKECODEUNIT(BINARY_ADD_FLOAT, saturating_start());
goto success;
}
else {
SPECIALIZATION_FAIL(BINARY_ADD, SPEC_FAIL_OTHER_TYPE);
}
fail:
STAT_INC(BINARY_ADD, specialization_failure);
assert(!PyErr_Occurred());
*instr = _Py_MAKECODEUNIT(_Py_OPCODE(*instr), ADAPTIVE_CACHE_BACKOFF);
return 0;
success:
STAT_INC(BINARY_ADD, specialization_success);
assert(!PyErr_Occurred());
return 0;
}