FEAT: conj and conjugate ufunc implementation

quaddtype/numpy_quaddtype/src/ops.hpp

@@ -37,6 +37,13 @@ quad_absolute(const Sleef_quad *op)
     return Sleef_fabsq1(*op);
 }
 
+static inline Sleef_quad
+quad_conjugate(const Sleef_quad *op)
+{
+    // For real numbers, conjugate is the identity function (no-op)
+    return *op;
+}
+
 static inline Sleef_quad
 quad_rint(const Sleef_quad *op)
 {
@@ -217,6 +224,13 @@ ld_absolute(const long double *op)
     return fabsl(*op);
 }
 
+static inline long double
+ld_conjugate(const long double *op)
+{
+    // For real numbers, conjugate is the identity function (no-op)
+    return *op;
+}
+
 static inline long double
 ld_sign(const long double *op)
 {

quaddtype/numpy_quaddtype/src/umath/unary_ops.cpp

@@ -161,6 +161,11 @@ init_quad_unary_ops(PyObject *numpy)
     if (create_quad_unary_ufunc<quad_absolute, ld_absolute>(numpy, "fabs") < 0) {
         return -1;
     }
+    // conjugate is a no-op for real numbers (returns the value unchanged)
+    if (create_quad_unary_ufunc<quad_conjugate, ld_conjugate>(numpy, "conjugate") < 0) {
+        return -1;
+    }
+    // conj is an alias for conjugate, no need to register
     if (create_quad_unary_ufunc<quad_sign, ld_sign>(numpy, "sign") < 0) {
         return -1;
     }

quaddtype/release_tracker.md

@@ -27,6 +27,9 @@
 | rint          | ✅    | ✅                                                                   |
 | sign          | ✅    | ✅                                                                   |
 | heaviside     | ✅    | ✅                                                                   |
+| conj          | ✅    | ✅                                                                   |
+| conjugate     | ✅    | ✅                                                                   |
+| heaviside     | ✅    | ✅                                                                   |
 | conj          |       |                                                                      |
 | conjugate     |       |                                                                      |
 | exp           | ✅    | ✅                                                                   |
@@ -40,8 +43,6 @@
 | square        | ✅    | ✅                                                                   |
 | cbrt          |       |                                                                      |
 | reciprocal    | ✅    | ✅                                                                   |
-| gcd           |       |                                                                      |
-| lcm           |       |                                                                      |
 | sin           | ✅    | ❌ _Need: basic tests + edge cases (NaN/inf/0/π multiples/2π range)_ |
 | cos           | ✅    | ❌ _Need: basic tests + edge cases (NaN/inf/0/π multiples/2π range)_ |
 | tan           | ✅    | ❌ _Need: basic tests + edge cases (NaN/inf/0/π/2 asymptotes)_       |

quaddtype/tests/test_quaddtype.py

@@ -1693,3 +1693,25 @@ def test_heaviside_broadcast():
     assert result.dtype.name == "QuadPrecDType128"
     np.testing.assert_array_equal(result.astype(float), expected)
 
+
+@pytest.mark.parametrize("func", [np.conj, np.conjugate])
+@pytest.mark.parametrize("value", [
+    0.0,
+    -0.0,
+    1.5,
+    -1.5,
+    np.inf,
+    -np.inf,
+    np.nan,
+])
+def test_conj_conjugate_identity(func, value):
+    """Test that conj and conjugate are identity (no-op) for real quad precision numbers"""
+    x = QuadPrecision(value)
+    result = func(x)
+
+    # For NaN, use special comparison
+    if np.isnan(value):
+        assert np.isnan(float(result))
+    else:
+        assert result == x
+