diff --git a/LICENSE b/LICENSE index 57bfc03fb..c06e706f5 100644 --- a/LICENSE +++ b/LICENSE @@ -729,3 +729,185 @@ Magnus Jonsson. -- Constants used in the rk_double implementation by Isaku Wada. + +-- + +The floor division and modulo implementations for integer numbers in C++ standalone +are based on the implementation in Cython (https://github.com/cython/cython), published +under the Apache License 2.0: + Apache License + Version 2.0, January 2004 + https://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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-}} +} + +// Specific implementations for integer types +// (from Cython, see LICENSE file) +template <> +inline int32_t _brian_mod(int32_t x, int32_t y) +{ + int32_t r = x % y; + r += ((r != 0) & ((r ^ y) < 0)) * y; + return r; +} + +template <> +inline int64_t _brian_mod(int32_t x, int64_t y) +{ + int64_t r = x % y; + r += ((r != 0) & ((r ^ y) < 0)) * y; + return r; +} + +template <> +inline int64_t _brian_mod(int64_t x, int32_t y) +{ + int64_t r = x % y; + r += ((r != 0) & ((r ^ y) < 0)) * y; + return r; +} + +template <> +inline int64_t _brian_mod(int64_t x, int64_t y) +{ + int64_t r = x % y; + r += ((r != 0) & ((r ^ y) < 0)) * y; + return r; +} """ floordiv_support_code = """ - +// General implementation, used for floating point types template < typename T1, typename T2 > static inline typename _higher_type::type _brian_floordiv(T1 x, T2 y) {{ return floor(1.0*x/y); }} + +// Specific implementations for integer types +// (from Cython, see LICENSE file) +template <> +inline int32_t _brian_floordiv(int32_t a, int32_t b) { + int32_t q = a / b; + int32_t r = a - q*b; + q -= ((r != 0) & ((r ^ b) < 0)); + return q; +} +template <> +inline int64_t _brian_floordiv(int32_t a, int64_t b) { + int64_t q = a / b; + int64_t r = a - q*b; + q -= ((r != 0) & ((r ^ b) < 0)); + return q; +} +template <> +inline int64_t _brian_floordiv(int64_t a, int32_t b) { + int64_t q = a / b; + int64_t r = a - q*b; + q -= ((r != 0) & ((r ^ b) < 0)); + return q; +} +template <> +inline int64_t _brian_floordiv(int64_t a, int64_t b) { + int64_t q = a / b; + int64_t r = a - q*b; + q -= ((r != 0) & ((r ^ b) < 0)); + return q; +} """ pow_support_code = """ diff --git a/brian2/tests/test_neurongroup.py b/brian2/tests/test_neurongroup.py index ff8fb7aa5..8b22a3240 100644 --- a/brian2/tests/test_neurongroup.py +++ b/brian2/tests/test_neurongroup.py @@ -2114,9 +2114,9 @@ def test_run_regularly_shared(): @pytest.mark.standalone_compatible def test_semantics_floor_division(): - # See github issues #815 and #661 + # See github issues #815, #661, and #1495 G = NeuronGroup( - 11, + 300, """ a : integer b : integer @@ -2127,25 +2127,25 @@ def test_semantics_floor_division(): """, dtype={"a": np.int32, "b": np.int64, "x": float, "y": float}, ) - int_values = np.arange(-5, 6) - float_values = np.arange(-5.0, 6.0, dtype=np.float64) + int_values = np.arange(-150, 150) + float_values = np.linspace(-100, 100, 300, dtype=np.float64) G.ivalue = int_values G.fvalue = float_values with catch_logs() as l: G.run_regularly( """ - a = ivalue//3 - b = ivalue//3 - x = fvalue//3 - y = fvalue//3 + a = ivalue//98 + b = ivalue//98 + x = fvalue//98 + y = fvalue//98 """ ) run(defaultclock.dt) assert len(l) == 0 - assert_equal(G.a[:], int_values // 3) - assert_equal(G.b[:], int_values // 3) - assert_allclose(G.x[:], float_values // 3) - assert_allclose(G.y[:], float_values // 3) + assert_equal(G.a[:], int_values // 98) + assert_equal(G.b[:], int_values // 98) + assert_allclose(G.x[:], float_values // 98) + assert_allclose(G.y[:], float_values // 98) @pytest.mark.standalone_compatible @@ -2188,7 +2188,7 @@ def test_semantics_floating_point_division(): def test_semantics_mod(): # See github issues #815 and #661 G = NeuronGroup( - 11, + 300, """ a : integer b : integer @@ -2199,25 +2199,25 @@ def test_semantics_mod(): """, dtype={"a": np.int32, "b": np.int64, "x": float, "y": float}, ) - int_values = np.arange(-5, 6) - float_values = np.arange(-5.0, 6.0, dtype=np.float64) + int_values = np.arange(-150, 150) + float_values = np.linspace(-100, 100, 300, dtype=np.float64) G.ivalue = int_values G.fvalue = float_values with catch_logs() as l: G.run_regularly( """ - a = ivalue % 3 - b = ivalue % 3 - x = fvalue % 3 - y = fvalue % 3 + a = ivalue % 98 + b = ivalue % 98 + x = fvalue % 98 + y = fvalue % 98 """ ) run(defaultclock.dt) assert len(l) == 0 - assert_equal(G.a[:], int_values % 3) - assert_equal(G.b[:], int_values % 3) - assert_allclose(G.x[:], float_values % 3) - assert_allclose(G.y[:], float_values % 3) + assert_equal(G.a[:], int_values % 98) + assert_equal(G.b[:], int_values % 98) + assert_allclose(G.x[:], float_values % 98) + assert_allclose(G.y[:], float_values % 98) if __name__ == "__main__":