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Add bits, precision, resolution constants #132

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Merged
merged 3 commits into from
Aug 23, 2025
+26 −2
Merged

Add bits, precision, resolution constants #132

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ce2b9e0
Add bits, precision, resolution constants
juntyr Aug 20, 2025
8fe110f
Move constant computation to C++
juntyr Aug 23, 2025
fe476c2
Use int64_t for sleef precision
juntyr Aug 23, 2025
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7 changes: 6 additions & 1 deletion quaddtype/numpy_quaddtype/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,13 @@
'SleefQuadPrecDType', 'LongDoubleQuadPrecDType', 'is_longdouble_128',
# Constants
'pi', 'e', 'log2e', 'log10e', 'ln2', 'ln10', 'max_value', 'epsilon',
'smallest_normal', 'smallest_subnormal',
'smallest_normal', 'smallest_subnormal', 'bits', 'precision', 'resolution',
# QuadBLAS related functions
'set_num_threads', 'get_num_threads', 'get_quadblas_version'
]

import numpy as np

def SleefQuadPrecision(value):
return QuadPrecision(value, backend='sleef')

Expand All @@ -40,3 +42,6 @@ def LongDoubleQuadPrecDType():
epsilon = get_sleef_constant("epsilon")
smallest_normal = get_sleef_constant("smallest_normal")
smallest_subnormal = get_sleef_constant("smallest_subnormal")
bits = SleefQuadPrecDType().itemsize * 8
precision = int(-np.log10(epsilon))
resolution = SleefQuadPrecision(10) ** (-precision)
7 changes: 6 additions & 1 deletion quaddtype/tests/test_quaddtype.py
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Expand Up @@ -19,11 +19,16 @@ def test_math_constant(name, expected):
assert np.float64(getattr(numpy_quaddtype, name)) == expected


@pytest.mark.parametrize("name", ["max_value", "epsilon", "smallest_normal", "smallest_subnormal"])
@pytest.mark.parametrize("name", ["max_value", "epsilon", "smallest_normal", "smallest_subnormal", "resolution"])
def test_finfo_constant(name):
assert isinstance(getattr(numpy_quaddtype, name), QuadPrecision)


@pytest.mark.parametrize("name,value", [("bits", 128), ("precision", 33)])
def test_finfo_int_constant(name, value):
assert getattr(numpy_quaddtype, name) == value


def test_basic_equality():
assert QuadPrecision("12") == QuadPrecision(
"12.0") == QuadPrecision("12.00")
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