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gh-100239: Handle NaN and zero division in guards #128963

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Merged
Eclips4 merged 8 commits into from
Jan 19, 2025
+71 −6
Merged

gh-100239: Handle NaN and zero division in guards #128963

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8547393
Fix zero division
Eclips4 Jan 17, 2025
131b92a
Reorder calls
Eclips4 Jan 17, 2025
8363e9d
Address Irit's review && Add guards for NaN
Eclips4 Jan 17, 2025
850a862
Update Python/specialize.c
Eclips4 Jan 18, 2025
f98667c
Apply the same technique for compactlong_float
Eclips4 Jan 18, 2025
27cd99a
I guess it should work
Eclips4 Jan 18, 2025
aa416bb
Apply suggestions from code review
Eclips4 Jan 19, 2025
127cb30
Address Irit's review
Eclips4 Jan 19, 2025
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Address Irit's review
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@Eclips4
Eclips4 committed Jan 19, 2025
commit 127cb30e1b0c25b2472a2547ccea409883cefecb
30 changes: 17 additions & 13 deletions Lib/test/test_opcache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1384,22 +1384,26 @@ def float_lhs(arg):

def binary_op_nan():
def compactlong_lhs(arg):
42 + arg
42 - arg
42 * arg
42 / arg
return (
42 + arg,
42 - arg,
42 * arg,
42 / arg,
)
def compactlong_rhs(arg):
arg + 42
arg - 42
arg * 42
arg / 42

compactlong_lhs(1.0)
return (
arg + 42,
arg - 42,
arg * 2,
arg / 42,
)
nan = float('nan')
self.assertEqual(compactlong_lhs(1.0), (43.0, 41.0, 42.0, 42.0))
for _ in range(100):
compactlong_lhs(float('nan'))
compactlong_rhs(1.0)
self.assertTrue(all(filter(lambda x: x is nan, compactlong_lhs(nan))))
self.assertEqual(compactlong_rhs(42.0), (84.0, 0.0, 84.0, 1.0))
for _ in range(100):
compactlong_rhs(float('nan'))
self.assertTrue(all(filter(lambda x: x is nan, compactlong_rhs(nan))))

self.assert_no_opcode(compactlong_lhs, "BINARY_OP_EXTEND")
self.assert_no_opcode(compactlong_rhs, "BINARY_OP_EXTEND")
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14 changes: 7 additions & 7 deletions Python/specialize.c
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Expand Up @@ -2421,14 +2421,14 @@ float_compactlong_guard(PyObject *lhs, PyObject *rhs)
{
return (
PyFloat_CheckExact(lhs) &&
!isnan(PyFloat_AsDouble(lhs)) &&
PyLong_CheckExact(rhs) &&
_PyLong_IsCompact((PyLongObject *)rhs) &&
!isnan(PyFloat_AsDouble(lhs))
_PyLong_IsCompact((PyLongObject *)rhs)
);
}

static inline int
float_compactlong_guard_true_div(PyObject *lhs, PyObject *rhs)
nonzero_float_compactlong_guard(PyObject *lhs, PyObject *rhs)
{
return (
float_compactlong_guard(lhs, rhs) && !PyLong_IsZero(rhs)
Expand All @@ -2455,15 +2455,15 @@ static inline int
compactlong_float_guard(PyObject *lhs, PyObject *rhs)
{
return (
PyFloat_CheckExact(rhs) &&
PyLong_CheckExact(lhs) &&
_PyLong_IsCompact((PyLongObject *)lhs) &&
PyFloat_CheckExact(rhs) &&
!isnan(PyFloat_AsDouble(rhs))
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);
}

static inline int
compactlong_float_guard_true_div(PyObject *lhs, PyObject *rhs)
nonzero_compactlong_float_guard(PyObject *lhs, PyObject *rhs)
{
return (
compactlong_float_guard(lhs, rhs) && PyFloat_AsDouble(rhs) != 0.0
Expand All @@ -2487,14 +2487,14 @@ LONG_FLOAT_ACTION(compactlong_float_true_div, /)
static _PyBinaryOpSpecializationDescr float_compactlong_specs[NB_OPARG_LAST+1] = {
[NB_ADD] = {float_compactlong_guard, float_compactlong_add},
[NB_SUBTRACT] = {float_compactlong_guard, float_compactlong_subtract},
[NB_TRUE_DIVIDE] = {float_compactlong_guard_true_div, float_compactlong_true_div},
[NB_TRUE_DIVIDE] = {nonzero_float_compactlong_guard, float_compactlong_true_div},
[NB_MULTIPLY] = {float_compactlong_guard, float_compactlong_multiply},
};

static _PyBinaryOpSpecializationDescr compactlong_float_specs[NB_OPARG_LAST+1] = {
[NB_ADD] = {compactlong_float_guard, compactlong_float_add},
[NB_SUBTRACT] = {compactlong_float_guard, compactlong_float_subtract},
[NB_TRUE_DIVIDE] = {compactlong_float_guard_true_div, compactlong_float_true_div},
[NB_TRUE_DIVIDE] = {nonzero_compactlong_float_guard, compactlong_float_true_div},
[NB_MULTIPLY] = {compactlong_float_guard, compactlong_float_multiply},
};

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