https://github.com/python/cpython/commit/46151648ca8ba1edd2a2783e8e154692a13d8ea8
commit: 46151648ca8ba1edd2a2783e8e154692a13d8ea8
branch: main
author: Tomas R. <tomas.ro...@gmail.com>
committer: brandtbucher <brandtbuc...@gmail.com>
date: 2025-06-06T16:44:43-07:00
summary:
GH-131798: Optimize away type(x) in the JIT when the result is known (GH-135194)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-06-05-21-58-30.gh-issue-131798.nt5Ab7.rst
M Lib/test/test_capi/test_opt.py
M Python/optimizer_bytecodes.c
M Python/optimizer_cases.c.h
diff --git a/Lib/test/test_capi/test_opt.py b/Lib/test/test_capi/test_opt.py
index a292ebcc7f4aed..ee8d261685d463 100644
--- a/Lib/test/test_capi/test_opt.py
+++ b/Lib/test/test_capi/test_opt.py
@@ -1778,11 +1778,12 @@ def testfunc(n):
self.assertNotIn("_GUARD_TOS_UNICODE", uops)
self.assertIn("_BINARY_OP_ADD_UNICODE", uops)
- def test_call_type_1(self):
+ def test_call_type_1_guards_removed(self):
def testfunc(n):
x = 0
for _ in range(n):
- x += type(42) is int
+ foo = eval('42')
+ x += type(foo) is int
return x
res, ex = self._run_with_optimizer(testfunc, TIER2_THRESHOLD)
@@ -1793,6 +1794,25 @@ def testfunc(n):
self.assertNotIn("_GUARD_NOS_NULL", uops)
self.assertNotIn("_GUARD_CALLABLE_TYPE_1", uops)
+ def test_call_type_1_known_type(self):
+ def testfunc(n):
+ x = 0
+ for _ in range(n):
+ x += type(42) is int
+ return x
+
+ res, ex = self._run_with_optimizer(testfunc, TIER2_THRESHOLD)
+ self.assertEqual(res, TIER2_THRESHOLD)
+ self.assertIsNotNone(ex)
+ uops = get_opnames(ex)
+ # When the result of type(...) is known, _CALL_TYPE_1 is replaced with
+ # _POP_CALL_ONE_LOAD_CONST_INLINE_BORROW which is optimized away in
+ # remove_unneeded_uops.
+ self.assertNotIn("_CALL_TYPE_1", uops)
+ self.assertNotIn("_POP_CALL_ONE_LOAD_CONST_INLINE_BORROW", uops)
+ self.assertNotIn("_POP_CALL_LOAD_CONST_INLINE_BORROW", uops)
+ self.assertNotIn("_POP_TOP_LOAD_CONST_INLINE_BORROW", uops)
+
def test_call_type_1_result_is_const(self):
def testfunc(n):
x = 0
@@ -1806,7 +1826,6 @@ def testfunc(n):
self.assertEqual(res, TIER2_THRESHOLD)
self.assertIsNotNone(ex)
uops = get_opnames(ex)
- self.assertIn("_CALL_TYPE_1", uops)
self.assertNotIn("_GUARD_IS_NOT_NONE_POP", uops)
def test_call_str_1(self):
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-06-05-21-58-30.gh-issue-131798.nt5Ab7.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-05-21-58-30.gh-issue-131798.nt5Ab7.rst
new file mode 100644
index 00000000000000..e4b5f610353f94
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-05-21-58-30.gh-issue-131798.nt5Ab7.rst
@@ -0,0 +1,2 @@
+Optimize away ``_CALL_TYPE_1`` in the JIT when the return type is known.
+Patch by Tomas Roun
diff --git a/Python/optimizer_bytecodes.c b/Python/optimizer_bytecodes.c
index b4220e2c627ecb..12efaacd8f0dfc 100644
--- a/Python/optimizer_bytecodes.c
+++ b/Python/optimizer_bytecodes.c
@@ -937,8 +937,11 @@ dummy_func(void) {
}
op(_CALL_TYPE_1, (unused, unused, arg -- res)) {
- if (sym_has_type(arg)) {
- res = sym_new_const(ctx, (PyObject *)sym_get_type(arg));
+ PyObject* type = (PyObject *)sym_get_type(arg);
+ if (type) {
+ res = sym_new_const(ctx, type);
+ REPLACE_OP(this_instr, _POP_CALL_ONE_LOAD_CONST_INLINE_BORROW, 0,
+ (uintptr_t)type);
}
else {
res = sym_new_not_null(ctx);
diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h
index 960c683800455e..1a2d49973ee916 100644
--- a/Python/optimizer_cases.c.h
+++ b/Python/optimizer_cases.c.h
@@ -2056,8 +2056,11 @@
JitOptSymbol *arg;
JitOptSymbol *res;
arg = stack_pointer[-1];
- if (sym_has_type(arg)) {
- res = sym_new_const(ctx, (PyObject *)sym_get_type(arg));
+ PyObject* type = (PyObject *)sym_get_type(arg);
+ if (type) {
+ res = sym_new_const(ctx, type);
+ REPLACE_OP(this_instr, _POP_CALL_ONE_LOAD_CONST_INLINE_BORROW,
0,
+ (uintptr_t)type);
}
else {
res = sym_new_not_null(ctx);
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