pythongh-115999: Don't take a reason in unspecialize (python#127030)

Don't take a reason in unspecialize

We only want to compute the reason if stats are enabled. Optimizing
compilers should optimize this away for us (gcc and clang do), but
it's better to be safe than sorry.

Author: mpage

Python/specialize.c

@@ -719,7 +719,7 @@ specialize(_Py_CODEUNIT *instr, uint8_t specialized_opcode)
 }
 
 static inline void
-unspecialize(_Py_CODEUNIT *instr, int reason)
+unspecialize(_Py_CODEUNIT *instr)
 {
     assert(!PyErr_Occurred());
     uint8_t opcode = FT_ATOMIC_LOAD_UINT8_RELAXED(instr->op.code);
@@ -729,7 +729,6 @@ unspecialize(_Py_CODEUNIT *instr, int reason)
         SPECIALIZATION_FAIL(generic_opcode, SPEC_FAIL_OTHER);
         return;
     }
-    SPECIALIZATION_FAIL(generic_opcode, reason);
     _Py_BackoffCounter *counter = (_Py_BackoffCounter *)instr + 1;
     _Py_BackoffCounter cur = load_counter(counter);
     set_counter(counter, adaptive_counter_backoff(cur));
@@ -2243,6 +2242,7 @@ _Py_Specialize_CallKw(_PyStackRef callable_st, _Py_CODEUNIT *instr, int nargs)
     }
 }
 
+#ifdef Py_STATS
 static int
 binary_op_fail_kind(int oparg, PyObject *lhs, PyObject *rhs)
 {
@@ -2310,6 +2310,7 @@ binary_op_fail_kind(int oparg, PyObject *lhs, PyObject *rhs)
     }
     Py_UNREACHABLE();
 }
+#endif
 
 void
 _Py_Specialize_BinaryOp(_PyStackRef lhs_st, _PyStackRef rhs_st, _Py_CODEUNIT *instr,
@@ -2373,7 +2374,8 @@ _Py_Specialize_BinaryOp(_PyStackRef lhs_st, _PyStackRef rhs_st, _Py_CODEUNIT *in
             }
             break;
     }
-    unspecialize(instr, binary_op_fail_kind(oparg, lhs, rhs));
+    SPECIALIZATION_FAIL(BINARY_OP, binary_op_fail_kind(oparg, lhs, rhs));
+    unspecialize(instr);
 }
 
 
@@ -2760,6 +2762,7 @@ _Py_Specialize_ToBool(_PyStackRef value_o, _Py_CODEUNIT *instr)
     cache->counter = adaptive_counter_cooldown();
 }
 
+#ifdef Py_STATS
 static int
 containsop_fail_kind(PyObject *value) {
     if (PyUnicode_CheckExact(value)) {
@@ -2776,6 +2779,7 @@ containsop_fail_kind(PyObject *value) {
     }
     return SPEC_FAIL_OTHER;
 }
+#endif
 
 void
 _Py_Specialize_ContainsOp(_PyStackRef value_st, _Py_CODEUNIT *instr)
@@ -2793,7 +2797,8 @@ _Py_Specialize_ContainsOp(_PyStackRef value_st, _Py_CODEUNIT *instr)
         return;
     }
 
-    unspecialize(instr, containsop_fail_kind(value));
+    SPECIALIZATION_FAIL(CONTAINS_OP, containsop_fail_kind(value));
+    unspecialize(instr);
     return;
 }