https://github.com/python/cpython/commit/6c8ca1c3783097b5db0fc40a7b625e2f7cc1fc5b
commit: 6c8ca1c3783097b5db0fc40a7b625e2f7cc1fc5b
branch: main
author: Sacul <[email protected]>
committer: Fidget-Spinner <[email protected]>
date: 2026-02-10T22:33:32+08:00
summary:
gh-134584: Optimize `_BINARY_OP_SUBSCR_LIST_SLICE` (GH-144659)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-02-10-12-08-58.gh-issue-134584.P9LDy5.rst
M Include/internal/pycore_opcode_metadata.h
M Include/internal/pycore_uop_ids.h
M Include/internal/pycore_uop_metadata.h
M Lib/test/test_capi/test_opt.py
M Modules/_testinternalcapi/test_cases.c.h
M Python/bytecodes.c
M Python/executor_cases.c.h
M Python/generated_cases.c.h
M Python/optimizer_bytecodes.c
M Python/optimizer_cases.c.h
diff --git a/Include/internal/pycore_opcode_metadata.h
b/Include/internal/pycore_opcode_metadata.h
index 98d9c2b51a7834..4c1e7aebd0d291 100644
--- a/Include/internal/pycore_opcode_metadata.h
+++ b/Include/internal/pycore_opcode_metadata.h
@@ -1103,7 +1103,7 @@ const struct opcode_metadata
_PyOpcode_opcode_metadata[267] = {
[BINARY_OP_SUBSCR_DICT] = { true, INSTR_FMT_IXC0000, HAS_EXIT_FLAG |
HAS_ERROR_FLAG | HAS_ERROR_NO_POP_FLAG | HAS_ESCAPES_FLAG },
[BINARY_OP_SUBSCR_GETITEM] = { true, INSTR_FMT_IXC0000, HAS_DEOPT_FLAG |
HAS_SYNC_SP_FLAG | HAS_NEEDS_GUARD_IP_FLAG | HAS_RECORDS_VALUE_FLAG },
[BINARY_OP_SUBSCR_LIST_INT] = { true, INSTR_FMT_IXC0000, HAS_DEOPT_FLAG |
HAS_EXIT_FLAG | HAS_ESCAPES_FLAG },
- [BINARY_OP_SUBSCR_LIST_SLICE] = { true, INSTR_FMT_IXC0000, HAS_EXIT_FLAG |
HAS_ERROR_FLAG | HAS_ESCAPES_FLAG },
+ [BINARY_OP_SUBSCR_LIST_SLICE] = { true, INSTR_FMT_IXC0000, HAS_EXIT_FLAG |
HAS_ERROR_FLAG | HAS_ERROR_NO_POP_FLAG | HAS_ESCAPES_FLAG },
[BINARY_OP_SUBSCR_STR_INT] = { true, INSTR_FMT_IXC0000, HAS_DEOPT_FLAG |
HAS_EXIT_FLAG },
[BINARY_OP_SUBSCR_TUPLE_INT] = { true, INSTR_FMT_IXC0000, HAS_DEOPT_FLAG |
HAS_EXIT_FLAG | HAS_ESCAPES_FLAG },
[BINARY_OP_SUBSCR_USTR_INT] = { true, INSTR_FMT_IXC0000, HAS_DEOPT_FLAG |
HAS_EXIT_FLAG },
@@ -1356,7 +1356,7 @@ _PyOpcode_macro_expansion[256] = {
[BINARY_OP_SUBSCR_DICT] = { .nuops = 4, .uops = { { _GUARD_NOS_DICT,
OPARG_SIMPLE, 0 }, { _BINARY_OP_SUBSCR_DICT, OPARG_SIMPLE, 5 }, { _POP_TOP,
OPARG_SIMPLE, 5 }, { _POP_TOP, OPARG_SIMPLE, 5 } } },
[BINARY_OP_SUBSCR_GETITEM] = { .nuops = 5, .uops = { { _RECORD_NOS,
OPARG_SIMPLE, 0 }, { _CHECK_PEP_523, OPARG_SIMPLE, 5 }, {
_BINARY_OP_SUBSCR_CHECK_FUNC, OPARG_SIMPLE, 5 }, { _BINARY_OP_SUBSCR_INIT_CALL,
OPARG_SIMPLE, 5 }, { _PUSH_FRAME, OPARG_SIMPLE, 5 } } },
[BINARY_OP_SUBSCR_LIST_INT] = { .nuops = 5, .uops = { { _GUARD_TOS_INT,
OPARG_SIMPLE, 0 }, { _GUARD_NOS_LIST, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_LIST_INT, OPARG_SIMPLE, 5 }, { _POP_TOP_INT, OPARG_SIMPLE, 5
}, { _POP_TOP, OPARG_SIMPLE, 5 } } },
- [BINARY_OP_SUBSCR_LIST_SLICE] = { .nuops = 3, .uops = { {
_GUARD_TOS_SLICE, OPARG_SIMPLE, 0 }, { _GUARD_NOS_LIST, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_LIST_SLICE, OPARG_SIMPLE, 5 } } },
+ [BINARY_OP_SUBSCR_LIST_SLICE] = { .nuops = 5, .uops = { {
_GUARD_TOS_SLICE, OPARG_SIMPLE, 0 }, { _GUARD_NOS_LIST, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_LIST_SLICE, OPARG_SIMPLE, 5 }, { _POP_TOP, OPARG_SIMPLE, 5 },
{ _POP_TOP, OPARG_SIMPLE, 5 } } },
[BINARY_OP_SUBSCR_STR_INT] = { .nuops = 5, .uops = { { _GUARD_TOS_INT,
OPARG_SIMPLE, 0 }, { _GUARD_NOS_COMPACT_ASCII, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_STR_INT, OPARG_SIMPLE, 5 }, { _POP_TOP_INT, OPARG_SIMPLE, 5
}, { _POP_TOP_UNICODE, OPARG_SIMPLE, 5 } } },
[BINARY_OP_SUBSCR_TUPLE_INT] = { .nuops = 6, .uops = { { _GUARD_TOS_INT,
OPARG_SIMPLE, 0 }, { _GUARD_NOS_TUPLE, OPARG_SIMPLE, 0 }, {
_GUARD_BINARY_OP_SUBSCR_TUPLE_INT_BOUNDS, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_TUPLE_INT, OPARG_SIMPLE, 5 }, { _POP_TOP_INT, OPARG_SIMPLE, 5
}, { _POP_TOP, OPARG_SIMPLE, 5 } } },
[BINARY_OP_SUBSCR_USTR_INT] = { .nuops = 5, .uops = { { _GUARD_TOS_INT,
OPARG_SIMPLE, 0 }, { _GUARD_NOS_UNICODE, OPARG_SIMPLE, 0 }, {
_BINARY_OP_SUBSCR_USTR_INT, OPARG_SIMPLE, 5 }, { _POP_TOP_INT, OPARG_SIMPLE, 5
}, { _POP_TOP_UNICODE, OPARG_SIMPLE, 5 } } },
diff --git a/Include/internal/pycore_uop_ids.h
b/Include/internal/pycore_uop_ids.h
index f9313621756b45..94b05b736ed277 100644
--- a/Include/internal/pycore_uop_ids.h
+++ b/Include/internal/pycore_uop_ids.h
@@ -414,7 +414,7 @@ extern "C" {
#define _BINARY_OP_SUBSCR_INIT_CALL_r21 611
#define _BINARY_OP_SUBSCR_INIT_CALL_r31 612
#define _BINARY_OP_SUBSCR_LIST_INT_r23 613
-#define _BINARY_OP_SUBSCR_LIST_SLICE_r21 614
+#define _BINARY_OP_SUBSCR_LIST_SLICE_r23 614
#define _BINARY_OP_SUBSCR_STR_INT_r23 615
#define _BINARY_OP_SUBSCR_TUPLE_INT_r03 616
#define _BINARY_OP_SUBSCR_TUPLE_INT_r13 617
diff --git a/Include/internal/pycore_uop_metadata.h
b/Include/internal/pycore_uop_metadata.h
index 0835ee5c9499d1..5a47eae7a9abb1 100644
--- a/Include/internal/pycore_uop_metadata.h
+++ b/Include/internal/pycore_uop_metadata.h
@@ -119,7 +119,7 @@ const uint32_t _PyUop_Flags[MAX_UOP_ID+1] = {
[_BINARY_SLICE] = HAS_ERROR_FLAG | HAS_ESCAPES_FLAG,
[_STORE_SLICE] = HAS_ERROR_FLAG | HAS_ESCAPES_FLAG,
[_BINARY_OP_SUBSCR_LIST_INT] = HAS_DEOPT_FLAG | HAS_ESCAPES_FLAG,
- [_BINARY_OP_SUBSCR_LIST_SLICE] = HAS_ERROR_FLAG | HAS_ESCAPES_FLAG,
+ [_BINARY_OP_SUBSCR_LIST_SLICE] = HAS_ERROR_FLAG | HAS_ERROR_NO_POP_FLAG |
HAS_ESCAPES_FLAG,
[_BINARY_OP_SUBSCR_STR_INT] = HAS_DEOPT_FLAG,
[_BINARY_OP_SUBSCR_USTR_INT] = HAS_DEOPT_FLAG,
[_GUARD_NOS_TUPLE] = HAS_EXIT_FLAG,
@@ -1159,7 +1159,7 @@ const _PyUopCachingInfo _PyUop_Caching[MAX_UOP_ID+1] = {
.entries = {
{ -1, -1, -1 },
{ -1, -1, -1 },
- { 1, 2, _BINARY_OP_SUBSCR_LIST_SLICE_r21 },
+ { 3, 2, _BINARY_OP_SUBSCR_LIST_SLICE_r23 },
{ -1, -1, -1 },
},
},
@@ -3702,7 +3702,7 @@ const uint16_t _PyUop_Uncached[MAX_UOP_REGS_ID+1] = {
[_BINARY_SLICE_r31] = _BINARY_SLICE,
[_STORE_SLICE_r30] = _STORE_SLICE,
[_BINARY_OP_SUBSCR_LIST_INT_r23] = _BINARY_OP_SUBSCR_LIST_INT,
- [_BINARY_OP_SUBSCR_LIST_SLICE_r21] = _BINARY_OP_SUBSCR_LIST_SLICE,
+ [_BINARY_OP_SUBSCR_LIST_SLICE_r23] = _BINARY_OP_SUBSCR_LIST_SLICE,
[_BINARY_OP_SUBSCR_STR_INT_r23] = _BINARY_OP_SUBSCR_STR_INT,
[_BINARY_OP_SUBSCR_USTR_INT_r23] = _BINARY_OP_SUBSCR_USTR_INT,
[_GUARD_NOS_TUPLE_r02] = _GUARD_NOS_TUPLE,
@@ -4297,7 +4297,7 @@ const char *const _PyOpcode_uop_name[MAX_UOP_REGS_ID+1] =
{
[_BINARY_OP_SUBSCR_LIST_INT] = "_BINARY_OP_SUBSCR_LIST_INT",
[_BINARY_OP_SUBSCR_LIST_INT_r23] = "_BINARY_OP_SUBSCR_LIST_INT_r23",
[_BINARY_OP_SUBSCR_LIST_SLICE] = "_BINARY_OP_SUBSCR_LIST_SLICE",
- [_BINARY_OP_SUBSCR_LIST_SLICE_r21] = "_BINARY_OP_SUBSCR_LIST_SLICE_r21",
+ [_BINARY_OP_SUBSCR_LIST_SLICE_r23] = "_BINARY_OP_SUBSCR_LIST_SLICE_r23",
[_BINARY_OP_SUBSCR_STR_INT] = "_BINARY_OP_SUBSCR_STR_INT",
[_BINARY_OP_SUBSCR_STR_INT_r23] = "_BINARY_OP_SUBSCR_STR_INT_r23",
[_BINARY_OP_SUBSCR_TUPLE_INT] = "_BINARY_OP_SUBSCR_TUPLE_INT",
diff --git a/Lib/test/test_capi/test_opt.py b/Lib/test/test_capi/test_opt.py
index 765cb69dc04df1..2cad53d9c0728b 100644
--- a/Lib/test/test_capi/test_opt.py
+++ b/Lib/test/test_capi/test_opt.py
@@ -3660,6 +3660,23 @@ def testfunc(n):
self.assertLessEqual(count_ops(ex, "_POP_TOP_INT"), 1)
self.assertIn("_POP_TOP_NOP", uops)
+ def test_binary_subscr_list_slice(self):
+ def testfunc(n):
+ x = 0
+ for _ in range(n):
+ l = [1, 2, 3]
+ x += l[0:1][0]
+ return x
+
+ res, ex = self._run_with_optimizer(testfunc, TIER2_THRESHOLD)
+ self.assertEqual(res, TIER2_THRESHOLD)
+ uops = get_opnames(ex)
+
+ self.assertIn("_BINARY_OP_SUBSCR_LIST_SLICE", uops)
+ self.assertNotIn("_GUARD_TOS_LIST", uops)
+ self.assertEqual(count_ops(ex, "_POP_TOP"), 3)
+ self.assertEqual(count_ops(ex, "_POP_TOP_NOP"), 4)
+
def test_is_op(self):
def test_is_false(n):
a = object()
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-02-10-12-08-58.gh-issue-134584.P9LDy5.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-02-10-12-08-58.gh-issue-134584.P9LDy5.rst
new file mode 100644
index 00000000000000..fab50180bb6219
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-02-10-12-08-58.gh-issue-134584.P9LDy5.rst
@@ -0,0 +1 @@
+Optimize and eliminate ref-counting in ``_BINARY_OP_SUBSCR_LIST_SLICE``
diff --git a/Modules/_testinternalcapi/test_cases.c.h
b/Modules/_testinternalcapi/test_cases.c.h
index dda3bc53dc5e0d..35b1bc4e17c5d5 100644
--- a/Modules/_testinternalcapi/test_cases.c.h
+++ b/Modules/_testinternalcapi/test_cases.c.h
@@ -892,6 +892,9 @@
_PyStackRef list_st;
_PyStackRef sub_st;
_PyStackRef res;
+ _PyStackRef ls;
+ _PyStackRef ss;
+ _PyStackRef value;
// _GUARD_TOS_SLICE
{
tos = stack_pointer[-1];
@@ -925,26 +928,31 @@
PyObject *res_o = _PyList_SliceSubscript(list, sub);
stack_pointer = _PyFrame_GetStackPointer(frame);
STAT_INC(BINARY_OP, hit);
- _PyFrame_SetStackPointer(frame, stack_pointer);
- _PyStackRef tmp = sub_st;
- sub_st = PyStackRef_NULL;
- stack_pointer[-1] = sub_st;
- PyStackRef_CLOSE(tmp);
- tmp = list_st;
- list_st = PyStackRef_NULL;
- stack_pointer[-2] = list_st;
- PyStackRef_CLOSE(tmp);
- stack_pointer = _PyFrame_GetStackPointer(frame);
- stack_pointer += -2;
- ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
if (res_o == NULL) {
JUMP_TO_LABEL(error);
}
res = PyStackRef_FromPyObjectSteal(res_o);
+ ls = list_st;
+ ss = sub_st;
+ }
+ // _POP_TOP
+ {
+ value = ss;
+ stack_pointer[-2] = res;
+ stack_pointer[-1] = ls;
+ _PyFrame_SetStackPointer(frame, stack_pointer);
+ PyStackRef_XCLOSE(value);
+ stack_pointer = _PyFrame_GetStackPointer(frame);
+ }
+ // _POP_TOP
+ {
+ value = ls;
+ stack_pointer += -1;
+ ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
+ _PyFrame_SetStackPointer(frame, stack_pointer);
+ PyStackRef_XCLOSE(value);
+ stack_pointer = _PyFrame_GetStackPointer(frame);
}
- stack_pointer[0] = res;
- stack_pointer += 1;
- ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
DISPATCH();
}
diff --git a/Python/bytecodes.c b/Python/bytecodes.c
index bd22599aef725d..e1884ac38c016d 100644
--- a/Python/bytecodes.c
+++ b/Python/bytecodes.c
@@ -938,9 +938,9 @@ dummy_func(
}
macro(BINARY_OP_SUBSCR_LIST_SLICE) =
- _GUARD_TOS_SLICE + _GUARD_NOS_LIST + unused/5 +
_BINARY_OP_SUBSCR_LIST_SLICE;
+ _GUARD_TOS_SLICE + _GUARD_NOS_LIST + unused/5 +
_BINARY_OP_SUBSCR_LIST_SLICE + POP_TOP + POP_TOP;
- op(_BINARY_OP_SUBSCR_LIST_SLICE, (list_st, sub_st -- res)) {
+ op(_BINARY_OP_SUBSCR_LIST_SLICE, (list_st, sub_st -- res, ls, ss)) {
PyObject *sub = PyStackRef_AsPyObjectBorrow(sub_st);
PyObject *list = PyStackRef_AsPyObjectBorrow(list_st);
@@ -949,9 +949,13 @@ dummy_func(
PyObject *res_o = _PyList_SliceSubscript(list, sub);
STAT_INC(BINARY_OP, hit);
- DECREF_INPUTS();
- ERROR_IF(res_o == NULL);
+ if (res_o == NULL) {
+ ERROR_NO_POP();
+ }
res = PyStackRef_FromPyObjectSteal(res_o);
+ ls = list_st;
+ ss = sub_st;
+ INPUTS_DEAD();
}
macro(BINARY_OP_SUBSCR_STR_INT) =
diff --git a/Python/executor_cases.c.h b/Python/executor_cases.c.h
index f8de66cbce3a9f..f976e150451d49 100644
--- a/Python/executor_cases.c.h
+++ b/Python/executor_cases.c.h
@@ -5368,12 +5368,14 @@
break;
}
- case _BINARY_OP_SUBSCR_LIST_SLICE_r21: {
+ case _BINARY_OP_SUBSCR_LIST_SLICE_r23: {
CHECK_CURRENT_CACHED_VALUES(2);
assert(WITHIN_STACK_BOUNDS_IGNORING_CACHE());
_PyStackRef sub_st;
_PyStackRef list_st;
_PyStackRef res;
+ _PyStackRef ls;
+ _PyStackRef ss;
_PyStackRef _stack_item_0 = _tos_cache0;
_PyStackRef _stack_item_1 = _tos_cache1;
sub_st = _stack_item_1;
@@ -5390,27 +5392,19 @@
PyObject *res_o = _PyList_SliceSubscript(list, sub);
stack_pointer = _PyFrame_GetStackPointer(frame);
STAT_INC(BINARY_OP, hit);
- _PyFrame_SetStackPointer(frame, stack_pointer);
- _PyStackRef tmp = sub_st;
- sub_st = PyStackRef_NULL;
- stack_pointer[-1] = sub_st;
- PyStackRef_CLOSE(tmp);
- tmp = list_st;
- list_st = PyStackRef_NULL;
- stack_pointer[-2] = list_st;
- PyStackRef_CLOSE(tmp);
- stack_pointer = _PyFrame_GetStackPointer(frame);
- stack_pointer += -2;
- ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
if (res_o == NULL) {
SET_CURRENT_CACHED_VALUES(0);
JUMP_TO_ERROR();
}
res = PyStackRef_FromPyObjectSteal(res_o);
+ ls = list_st;
+ ss = sub_st;
+ _tos_cache2 = ss;
+ _tos_cache1 = ls;
_tos_cache0 = res;
- _tos_cache1 = PyStackRef_ZERO_BITS;
- _tos_cache2 = PyStackRef_ZERO_BITS;
- SET_CURRENT_CACHED_VALUES(1);
+ SET_CURRENT_CACHED_VALUES(3);
+ stack_pointer += -2;
+ ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
assert(WITHIN_STACK_BOUNDS_IGNORING_CACHE());
break;
}
diff --git a/Python/generated_cases.c.h b/Python/generated_cases.c.h
index 4cc9d9e03a545d..202bf5edcf09df 100644
--- a/Python/generated_cases.c.h
+++ b/Python/generated_cases.c.h
@@ -892,6 +892,9 @@
_PyStackRef list_st;
_PyStackRef sub_st;
_PyStackRef res;
+ _PyStackRef ls;
+ _PyStackRef ss;
+ _PyStackRef value;
// _GUARD_TOS_SLICE
{
tos = stack_pointer[-1];
@@ -925,26 +928,31 @@
PyObject *res_o = _PyList_SliceSubscript(list, sub);
stack_pointer = _PyFrame_GetStackPointer(frame);
STAT_INC(BINARY_OP, hit);
- _PyFrame_SetStackPointer(frame, stack_pointer);
- _PyStackRef tmp = sub_st;
- sub_st = PyStackRef_NULL;
- stack_pointer[-1] = sub_st;
- PyStackRef_CLOSE(tmp);
- tmp = list_st;
- list_st = PyStackRef_NULL;
- stack_pointer[-2] = list_st;
- PyStackRef_CLOSE(tmp);
- stack_pointer = _PyFrame_GetStackPointer(frame);
- stack_pointer += -2;
- ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
if (res_o == NULL) {
JUMP_TO_LABEL(error);
}
res = PyStackRef_FromPyObjectSteal(res_o);
+ ls = list_st;
+ ss = sub_st;
+ }
+ // _POP_TOP
+ {
+ value = ss;
+ stack_pointer[-2] = res;
+ stack_pointer[-1] = ls;
+ _PyFrame_SetStackPointer(frame, stack_pointer);
+ PyStackRef_XCLOSE(value);
+ stack_pointer = _PyFrame_GetStackPointer(frame);
+ }
+ // _POP_TOP
+ {
+ value = ls;
+ stack_pointer += -1;
+ ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
+ _PyFrame_SetStackPointer(frame, stack_pointer);
+ PyStackRef_XCLOSE(value);
+ stack_pointer = _PyFrame_GetStackPointer(frame);
}
- stack_pointer[0] = res;
- stack_pointer += 1;
- ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
DISPATCH();
}
diff --git a/Python/optimizer_bytecodes.c b/Python/optimizer_bytecodes.c
index e82770742a356c..7c928e6502a412 100644
--- a/Python/optimizer_bytecodes.c
+++ b/Python/optimizer_bytecodes.c
@@ -422,6 +422,12 @@ dummy_func(void) {
ss = sub_st;
}
+ op(_BINARY_OP_SUBSCR_LIST_SLICE, (list_st, sub_st -- res, ls, ss)) {
+ res = sym_new_type(ctx, &PyList_Type);
+ ls = list_st;
+ ss = sub_st;
+ }
+
op(_TO_BOOL, (value -- res)) {
int already_bool = optimize_to_bool(this_instr, ctx, value, &res,
false);
if (!already_bool) {
diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h
index cc1d28f49442b4..24ae511ebcde31 100644
--- a/Python/optimizer_cases.c.h
+++ b/Python/optimizer_cases.c.h
@@ -957,11 +957,21 @@
}
case _BINARY_OP_SUBSCR_LIST_SLICE: {
+ JitOptRef sub_st;
+ JitOptRef list_st;
JitOptRef res;
- res = sym_new_not_null(ctx);
- CHECK_STACK_BOUNDS(-1);
+ JitOptRef ls;
+ JitOptRef ss;
+ sub_st = stack_pointer[-1];
+ list_st = stack_pointer[-2];
+ res = sym_new_type(ctx, &PyList_Type);
+ ls = list_st;
+ ss = sub_st;
+ CHECK_STACK_BOUNDS(1);
stack_pointer[-2] = res;
- stack_pointer += -1;
+ stack_pointer[-1] = ls;
+ stack_pointer[0] = ss;
+ stack_pointer += 1;
ASSERT_WITHIN_STACK_BOUNDS(__FILE__, __LINE__);
break;
}
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