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bpo-46372: Try to mutate the LHS during fast float ops #30594

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cf64e13
Perform specialized ops in-place when possible
brandtbucher Jan 11, 2022
5e49a13
Break out common logic
brandtbucher Jan 12, 2022
f7187d9
Clean things up a bit
brandtbucher Jan 12, 2022
dd19cec
Clean up macro
brandtbucher Jan 12, 2022
78cc5c4
Simplify the "small" int case
brandtbucher Jan 13, 2022
218b10b
blurb add
brandtbucher Jan 14, 2022
505fd8e
Catch up with main
brandtbucher Jan 18, 2022
6b4cc6d
Apply first round of code revew comments
brandtbucher Jan 18, 2022
f21a813
Fix 32-bit Windows errrors
brandtbucher Jan 19, 2022
d6a69d5
Perform the inplace checks when specializing
brandtbucher Jan 19, 2022
f11cf6d
Remove duplicate code
brandtbucher Jan 19, 2022
b6f041a
Simplify things further
brandtbucher Jan 19, 2022
eb586b1
Remove int and refcount == 2 optimizations
brandtbucher Jan 19, 2022
def9c64
Catch up with main
brandtbucher Jan 21, 2022
6e262ba
Revert int changes
brandtbucher Jan 24, 2022
37fab55
Catch up with main
brandtbucher Jan 28, 2022
04f186c
Add the "adaptive superinstructions" back
brandtbucher Feb 1, 2022
e0d0042
Catch up with main
brandtbucher Feb 1, 2022
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Revert int changes
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@brandtbucher
brandtbucher committed Jan 24, 2022
commit 6e262ba3d35922b2b4226ba0ace8559a706c8564
4 changes: 4 additions & 0 deletions Include/internal/pycore_long.h
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Expand Up @@ -37,6 +37,10 @@ static inline PyObject* _PyLong_GetZero(void)
static inline PyObject* _PyLong_GetOne(void)
{ return (PyObject *)&_PyLong_SMALL_INTS[_PY_NSMALLNEGINTS+1]; }

PyObject *_PyLong_Add(PyLongObject *left, PyLongObject *right);
PyObject *_PyLong_Multiply(PyLongObject *left, PyLongObject *right);
PyObject *_PyLong_Subtract(PyLongObject *left, PyLongObject *right);

/* Used by Python/mystrtoul.c, _PyBytes_FromHex(),
_PyBytes_DecodeEscape(), etc. */
PyAPI_DATA(unsigned char) _PyLong_DigitValue[256];
Expand Down
2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Core and Builtins/2022-01-13-22-50-49.bpo-46372.b00Vdn.rst
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
Improve the performance of specialized :class:`int` and :class:`float`
Improve the performance of specialized :class:`float`
operations by mutating the left operand in-place when it is safe to do so.
40 changes: 30 additions & 10 deletions Objects/longobject.c
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Expand Up @@ -3140,10 +3140,9 @@ x_sub(PyLongObject *a, PyLongObject *b)
return maybe_small_long(long_normalize(z));
}

static PyObject *
long_add(PyLongObject *a, PyLongObject *b)
PyObject *
_PyLong_Add(PyLongObject *a, PyLongObject *b)
{
CHECK_BINOP(a, b);
if (IS_MEDIUM_VALUE(a) && IS_MEDIUM_VALUE(b)) {
return _PyLong_FromSTwoDigits(medium_value(a) + medium_value(b));
}
Expand Down Expand Up @@ -3174,14 +3173,20 @@ long_add(PyLongObject *a, PyLongObject *b)
}

static PyObject *
long_sub(PyLongObject *a, PyLongObject *b)
long_add(PyLongObject *a, PyLongObject *b)
{
CHECK_BINOP(a, b);
return _PyLong_Add(a, b);
}

PyObject *
_PyLong_Subtract(PyLongObject *a, PyLongObject *b)
{
PyLongObject *z;

if (IS_MEDIUM_VALUE(a) && IS_MEDIUM_VALUE(b)) {
return _PyLong_FromSTwoDigits(medium_value(a) - medium_value(b));
}

PyLongObject *z;
if (Py_SIZE(a) < 0) {
if (Py_SIZE(b) < 0) {
z = x_sub(b, a);
Expand All @@ -3203,6 +3208,13 @@ long_sub(PyLongObject *a, PyLongObject *b)
return (PyObject *)z;
}

static PyObject *
long_sub(PyLongObject *a, PyLongObject *b)
{
CHECK_BINOP(a, b);
return _PyLong_Subtract(a, b);
}

/* Grade school multiplication, ignoring the signs.
* Returns the absolute value of the product, or NULL if error.
*/
Expand Down Expand Up @@ -3620,17 +3632,18 @@ k_lopsided_mul(PyLongObject *a, PyLongObject *b)
return NULL;
}

static PyObject *
long_mul(PyLongObject *a, PyLongObject *b)
PyObject *
_PyLong_Multiply(PyLongObject *a, PyLongObject *b)
{
CHECK_BINOP(a, b);
PyLongObject *z;

/* fast path for single-digit multiplication */
if (IS_MEDIUM_VALUE(a) && IS_MEDIUM_VALUE(b)) {
stwodigits v = medium_value(a) * medium_value(b);
return _PyLong_FromSTwoDigits(v);
}

PyLongObject *z = k_mul(a, b);
z = k_mul(a, b);
/* Negate if exactly one of the inputs is negative. */
if (((Py_SIZE(a) ^ Py_SIZE(b)) < 0) && z) {
_PyLong_Negate(&z);
Expand All @@ -3640,6 +3653,13 @@ long_mul(PyLongObject *a, PyLongObject *b)
return (PyObject *)z;
}

static PyObject *
long_mul(PyLongObject *a, PyLongObject *b)
{
CHECK_BINOP(a, b);
return _PyLong_Multiply(a, b);
}

/* Fast modulo division for single-digit longs. */
static PyObject *
fast_mod(PyLongObject *a, PyLongObject *b)
Expand Down
70 changes: 42 additions & 28 deletions Python/ceval.c
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Expand Up @@ -857,31 +857,6 @@ static const binaryfunc binary_ops[] = {
[NB_INPLACE_XOR] = PyNumber_InPlaceXor,
};

#define BINARY_OP_FAST_INT(OP) \
do { \
PyObject *lhs = SECOND(); \
PyObject *rhs = TOP(); \
DEOPT_IF(!PyLong_CheckExact(lhs), BINARY_OP); \
DEOPT_IF(!PyLong_CheckExact(rhs), BINARY_OP); \
DEOPT_IF(1 < Py_ABS(Py_SIZE(lhs)), BINARY_OP); \
DEOPT_IF(1 < Py_ABS(Py_SIZE(rhs)), BINARY_OP); \
STAT_INC(BINARY_OP, hit); \
PyLongObject *lhs_long = (PyLongObject *)lhs; \
PyLongObject *rhs_long = (PyLongObject *)rhs; \
stwodigits l = Py_SIZE(lhs) * (sdigit)lhs_long->ob_digit[0]; \
stwodigits r = Py_SIZE(rhs) * (sdigit)rhs_long->ob_digit[0]; \
stwodigits i = l OP r; \
Py_DECREF(lhs); \
Py_DECREF(rhs); \
STACK_SHRINK(1); \
PyObject *res = PyLong_FromLongLong(i); \
SET_TOP(res); \
if (res == NULL) { \
goto error; \
} \
DISPATCH(); \
} while (0)

#define BINARY_OP_FAST_FLOAT(OP) \
do { \
PyObject *lhs = SECOND(); \
Expand Down Expand Up @@ -2067,15 +2042,41 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
}

TARGET(BINARY_OP_MULTIPLY_INT) {
BINARY_OP_FAST_INT(*);
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyLong_CheckExact(left), BINARY_OP);
DEOPT_IF(!PyLong_CheckExact(right), BINARY_OP);
STAT_INC(BINARY_OP, hit);
PyObject *prod = _PyLong_Multiply((PyLongObject *)left, (PyLongObject *)right);
SET_SECOND(prod);
Py_DECREF(right);
Py_DECREF(left);
STACK_SHRINK(1);
if (prod == NULL) {
goto error;
}
DISPATCH();
}

TARGET(BINARY_OP_MULTIPLY_FLOAT) {
BINARY_OP_FAST_FLOAT(*);
}

TARGET(BINARY_OP_SUBTRACT_INT) {
BINARY_OP_FAST_INT(-);
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyLong_CheckExact(left), BINARY_OP);
DEOPT_IF(!PyLong_CheckExact(right), BINARY_OP);
STAT_INC(BINARY_OP, hit);
PyObject *sub = _PyLong_Subtract((PyLongObject *)left, (PyLongObject *)right);
SET_SECOND(sub);
Py_DECREF(right);
Py_DECREF(left);
STACK_SHRINK(1);
if (sub == NULL) {
goto error;
}
DISPATCH();
}

TARGET(BINARY_OP_SUBTRACT_FLOAT) {
Expand Down Expand Up @@ -2132,7 +2133,20 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
}

TARGET(BINARY_OP_ADD_INT) {
BINARY_OP_FAST_INT(+);
PyObject *left = SECOND();
PyObject *right = TOP();
DEOPT_IF(!PyLong_CheckExact(left), BINARY_OP);
DEOPT_IF(Py_TYPE(right) != Py_TYPE(left), BINARY_OP);
STAT_INC(BINARY_OP, hit);
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();
}

TARGET(BINARY_SUBSCR) {
Expand Down
12 changes: 3 additions & 9 deletions Python/specialize.c
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Expand Up @@ -1617,9 +1617,7 @@ _Py_Specialize_BinaryOp(PyObject *lhs, PyObject *rhs, _Py_CODEUNIT *instr,
_Py_OPARG(*instr));
goto success;
}
if (PyLong_CheckExact(lhs) &&
Py_ABS(Py_SIZE(lhs)) < 2 && Py_ABS(Py_SIZE(rhs)) < 2)
{
if (PyLong_CheckExact(lhs)) {
*instr = _Py_MAKECODEUNIT(BINARY_OP_ADD_INT, _Py_OPARG(*instr));
goto success;
}
Expand All @@ -1635,9 +1633,7 @@ _Py_Specialize_BinaryOp(PyObject *lhs, PyObject *rhs, _Py_CODEUNIT *instr,
SPECIALIZATION_FAIL(BINARY_OP, SPEC_FAIL_DIFFERENT_TYPES);
goto failure;
}
if (PyLong_CheckExact(lhs) &&
Py_ABS(Py_SIZE(lhs)) < 2 && Py_ABS(Py_SIZE(rhs)) < 2)
{
if (PyLong_CheckExact(lhs)) {
*instr = _Py_MAKECODEUNIT(BINARY_OP_MULTIPLY_INT,
_Py_OPARG(*instr));
goto success;
Expand All @@ -1654,9 +1650,7 @@ _Py_Specialize_BinaryOp(PyObject *lhs, PyObject *rhs, _Py_CODEUNIT *instr,
SPECIALIZATION_FAIL(BINARY_OP, SPEC_FAIL_DIFFERENT_TYPES);
goto failure;
}
if (PyLong_CheckExact(lhs) &&
Py_ABS(Py_SIZE(lhs)) < 2 && Py_ABS(Py_SIZE(rhs)) < 2)
{
if (PyLong_CheckExact(lhs)) {
*instr = _Py_MAKECODEUNIT(BINARY_OP_SUBTRACT_INT,
_Py_OPARG(*instr));
goto success;
Expand Down