Modernize LOAD_GLOBAL_BUILTIN

Author: gvanrossum

Python/bytecodes.c

@@ -1071,7 +1071,7 @@ dummy_func(
         family(load_global, INLINE_CACHE_ENTRIES_LOAD_GLOBAL) = {
             LOAD_GLOBAL,
             LOAD_GLOBAL_MODULE,
-            // LOAD_GLOBAL_BUILTIN,
+            LOAD_GLOBAL_BUILTIN,
         };
 
         inst(LOAD_GLOBAL, (unused/1, unused/1, unused/2, unused/1 -- null if (oparg & 1), v)) {
@@ -1143,28 +1143,21 @@ dummy_func(
             null = NULL;
         }
 
-        // error: LOAD_GLOBAL has irregular stack effect
-        inst(LOAD_GLOBAL_BUILTIN) {
+        inst(LOAD_GLOBAL_BUILTIN, (unused/1, index/1, mod_version/2, bltn_version/1 -- null if (oparg & 1), res)) {
             assert(cframe.use_tracing == 0);
             DEOPT_IF(!PyDict_CheckExact(GLOBALS()), LOAD_GLOBAL);
             DEOPT_IF(!PyDict_CheckExact(BUILTINS()), LOAD_GLOBAL);
             PyDictObject *mdict = (PyDictObject *)GLOBALS();
             PyDictObject *bdict = (PyDictObject *)BUILTINS();
-            _PyLoadGlobalCache *cache = (_PyLoadGlobalCache *)next_instr;
-            uint32_t mod_version = read_u32(cache->module_keys_version);
-            uint16_t bltn_version = cache->builtin_keys_version;
             DEOPT_IF(mdict->ma_keys->dk_version != mod_version, LOAD_GLOBAL);
             DEOPT_IF(bdict->ma_keys->dk_version != bltn_version, LOAD_GLOBAL);
             assert(DK_IS_UNICODE(bdict->ma_keys));
             PyDictUnicodeEntry *entries = DK_UNICODE_ENTRIES(bdict->ma_keys);
-            PyObject *res = entries[cache->index].me_value;
+            res = entries[index].me_value;
             DEOPT_IF(res == NULL, LOAD_GLOBAL);
-            int push_null = oparg & 1;
-            PEEK(0) = NULL;
-            JUMPBY(INLINE_CACHE_ENTRIES_LOAD_GLOBAL);
+            Py_INCREF(res);
             STAT_INC(LOAD_GLOBAL, hit);
-            STACK_GROW(push_null+1);
-            SET_TOP(Py_NewRef(res));
+            null = NULL;
         }
 
         inst(DELETE_FAST, (--)) {

Python/generated_cases.c.h

@@ -145,7 +145,7 @@ _PyOpcode_num_popped(int opcode, int oparg) {
         case LOAD_GLOBAL_MODULE:
             return 0;
         case LOAD_GLOBAL_BUILTIN:
-            return -1;
+            return 0;
         case DELETE_FAST:
             return 0;
         case MAKE_CELL:
@@ -491,7 +491,7 @@ _PyOpcode_num_pushed(int opcode, int oparg) {
         case LOAD_GLOBAL_MODULE:
             return ((oparg & 1) ? 1 : 0) + 1;
         case LOAD_GLOBAL_BUILTIN:
-            return -1;
+            return ((oparg & 1) ? 1 : 0) + 1;
         case DELETE_FAST:
             return 0;
         case MAKE_CELL:
@@ -771,7 +771,7 @@ struct opcode_metadata {
     [LOAD_NAME] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
     [LOAD_GLOBAL] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IBC0000 },
     [LOAD_GLOBAL_MODULE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IBC0000 },
-    [LOAD_GLOBAL_BUILTIN] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
+    [LOAD_GLOBAL_BUILTIN] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IBC0000 },
     [DELETE_FAST] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
     [MAKE_CELL] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
     [DELETE_DEREF] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },