alternative forms of black magic

Author: Fidget-Spinner

Objects/floatobject.c

@@ -2618,8 +2618,11 @@ PyFloat_Unpack8(const char *data, int le)
 PyObject*
 _PyFloat_From64Bits(int64_t val)
 {
+    union caster {
+        int64_t from;
+        double to;
+    };
     assert(sizeof(double) == sizeof(int64_t));
-    double dst;
-    memcpy(&dst, &val, sizeof(int64_t));
-    return PyFloat_FromDouble(dst);
+    union caster temp = {.from = val};
+    return PyFloat_FromDouble(temp.to);
 }

Python/optimizer_analysis.c

@@ -286,11 +286,13 @@ remove_globals(_PyInterpreterFrame *frame, _PyUOpInstruction *buffer,
 
 static int64_t
 double_as_int64_t(double in) {
+    union caster {
+        double from;
+        int64_t to;
+    };
     assert(sizeof(double) == sizeof(int64_t));
-    double temp = in;
-    int64_t result;
-    memcpy(&result, &temp, sizeof(double));
-    return result;
+    union caster temp = {.from = in};
+    return temp.to;
 }
 
 #define STACK_LEVEL()     ((int)(stack_pointer - ctx->frame->stack))