use memcpy

Author: SwayamInSync

quaddtype/numpy_quaddtype/src/casts.cpp

@@ -1245,8 +1245,8 @@ static inline int quad_to_numpy_same_value_check(quad_value x, QuadBackendType b
         if(x.longdouble_value == roundtrip.longdouble_value)
             return 1;
     }
-    // Sleef_quad sleef_val = quad_to_sleef_quad(&x, backend);
-    Sleef_quad sleef_val = x.sleef_value;
+    Sleef_quad sleef_val = quad_to_sleef_quad(&x, backend);
+    // Sleef_quad sleef_val = x.sleef_value;
     const char *val_str = quad_to_string_adaptive_cstr(&sleef_val, QUAD_STR_WIDTH);
     if (val_str != NULL) {
         PyErr_Format(PyExc_ValueError, 

quaddtype/numpy_quaddtype/src/utilities.c

@@ -262,9 +262,13 @@ Sleef_quad
 quad_to_sleef_quad(const quad_value *in_val, QuadBackendType backend)
 {
     if (backend == BACKEND_SLEEF) {
-        return in_val->sleef_value;
+        // can directly return but that causes union heisenbugs, 
+        // but this helper is rare to use, so acceptable
+        Sleef_quad result;
+        memcpy(&result, &in_val->sleef_value, sizeof(Sleef_quad));
+        return result;
     }
     else {
-        return Sleef_cast_from_doubleq1(in_val->longdouble_value);
+        return Sleef_cast_from_doubleq1((double)(in_val->longdouble_value));
     }
 }