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bpo-45636: Remove the old %-formatting fast-path (GH-29532)

This commit is contained in:
Brandt Bucher 2021-11-15 08:58:23 -08:00 committed by GitHub
parent 822c3dcce3
commit ec382fac0d
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 10 additions and 12 deletions
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2
Misc/NEWS.d/next/Core and Builtins/2021-11-11-19-11-57.bpo-45636.2fyIVm.rst Normal file
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@ -0,0 +1,2 @@
Remove an existing "fast path" for old-style string formatting, since
it no longer appears to have any measurable impact.

8
Python/ceval.c
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@ -4711,14 +4711,6 @@ check_eval_breaker:
res = PyNumber_Multiply(lhs, rhs);
break;
case NB_REMAINDER:
if (PyUnicode_CheckExact(lhs) &&
(!PyUnicode_Check(rhs) || PyUnicode_CheckExact(rhs)))
{
// bpo-28598: Fast path for string formatting (but not
// if the RHS is a str subclass).
res = PyUnicode_Format(lhs, rhs);
break;
}
res = PyNumber_Remainder(lhs, rhs);
break;
case NB_OR:

12
Python/specialize.c
View File

@ -1380,13 +1380,13 @@ _Py_Specialize_BinaryOp(PyObject *lhs, PyObject *rhs, _Py_CODEUNIT *instr,
SpecializedCacheEntry *cache)
{
_PyAdaptiveEntry *adaptive = &cache->adaptive;
if (!Py_IS_TYPE(lhs, Py_TYPE(rhs))) {
SPECIALIZATION_FAIL(BINARY_OP, SPEC_FAIL_DIFFERENT_TYPES);
goto failure;
}
switch (adaptive->original_oparg) {
case NB_ADD:
case NB_INPLACE_ADD:
if (!Py_IS_TYPE(lhs, Py_TYPE(rhs))) {
SPECIALIZATION_FAIL(BINARY_OP, SPEC_FAIL_DIFFERENT_TYPES);
goto failure;
}
if (PyUnicode_CheckExact(lhs)) {
if (_Py_OPCODE(instr[1]) == STORE_FAST && Py_REFCNT(lhs) == 2) {
*instr = _Py_MAKECODEUNIT(BINARY_OP_INPLACE_ADD_UNICODE,
@ -1409,6 +1409,10 @@ _Py_Specialize_BinaryOp(PyObject *lhs, PyObject *rhs, _Py_CODEUNIT *instr,
break;
case NB_MULTIPLY:
case NB_INPLACE_MULTIPLY:
if (!Py_IS_TYPE(lhs, Py_TYPE(rhs))) {
SPECIALIZATION_FAIL(BINARY_OP, SPEC_FAIL_DIFFERENT_TYPES);
goto failure;
}
if (PyLong_CheckExact(lhs)) {
*instr = _Py_MAKECODEUNIT(BINARY_OP_MULTIPLY_INT,
_Py_OPARG(*instr));