Change opcode to uint16_t

Author: mdboom

Python/ceval.c

@@ -666,15 +666,6 @@ extern const char *_PyUopName(int index);
  * so consume 3 units of C stack */
 #define PY_EVAL_C_STACK_UNITS 2
 
-#if defined(_MSC_VER) && defined(_Py_USING_PGO)
-/* gh-111786: _PyEval_EvalFrameDefault is too large to optimize for speed with
-   PGO on MSVC. Disable that optimization temporarily. If this is fixed
-   upstream, we should gate this on the version of MSVC.
- */
-#  pragma optimize("t", off)
-/* This setting is reversed below following _PyEval_EvalFrameDefault */
-#endif
-
 PyObject* _Py_HOT_FUNCTION
 _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag)
 {
@@ -689,8 +680,8 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 #ifdef Py_STATS
     int lastopcode = 0;
 #endif
-    int opcode;        /* Current opcode */
-    int oparg;         /* Current opcode argument, if any */
+    uint16_t opcode;       /* Current opcode */
+    int oparg;            /* Current opcode argument, if any */
 #ifdef LLTRACE
     int lltrace = 0;
 #endif
@@ -822,7 +813,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 #if USE_COMPUTED_GOTOS
         _unknown_opcode:
 #else
-        EXTRA_CASES  // From pycore_opcode.h, a 'case' for each unused opcode
+        EXTRA_CASES  // From pycore_opcode_metadata.h, a 'case' for each unused opcode
 #endif
             /* Tell C compilers not to hold the opcode variable in the loop.
                next_instr points the current instruction without TARGET(). */
@@ -1092,7 +1083,6 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 #  pragma GCC diagnostic pop
 #elif defined(_MSC_VER) /* MS_WINDOWS */
 #  pragma warning(pop)
-#  pragma optimize("", on)
 #endif
 
 static void