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bpo-44900: Add five superinstructions. (GH-27741)

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* LOAD_FAST LOAD_FAST
* STORE_FAST LOAD_FAST
* LOAD_FAST LOAD_CONST
* LOAD_CONST LOAD_FAST
* STORE_FAST STORE_FAST
This commit is contained in:
Mark Shannon 2021-08-16 12:23:13 +01:00 • committed by GitHub
parent 1a511dc92d
commit 4f51fa9e2d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 133 additions and 20 deletions
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5
Include/opcode.h generated
View file

@ -153,6 +153,11 @@ extern "C" {
#define STORE_ATTR_SPLIT_KEYS 45
#define STORE_ATTR_SLOT 46
#define STORE_ATTR_WITH_HINT 47
#define LOAD_FAST__LOAD_FAST 48
#define STORE_FAST__LOAD_FAST 58
#define LOAD_FAST__LOAD_CONST 80
#define LOAD_CONST__LOAD_FAST 81
#define STORE_FAST__STORE_FAST 87
#ifdef NEED_OPCODE_JUMP_TABLES
static uint32_t _PyOpcode_RelativeJump[8] = {
0U,

7
Lib/opcode.py
View file

@ -237,8 +237,13 @@ def jabs_op(name, op):
"STORE_ATTR_SPLIT_KEYS",
"STORE_ATTR_SLOT",
"STORE_ATTR_WITH_HINT",
# Super instructions
"LOAD_FAST__LOAD_FAST",
"STORE_FAST__LOAD_FAST",
"LOAD_FAST__LOAD_CONST",
"LOAD_CONST__LOAD_FAST",
"STORE_FAST__STORE_FAST",
]
_specialization_stats = [
"specialization_success",
"specialization_failure",

7
Misc/NEWS.d/next/Core and Builtins/2021-08-12-14-00-57.bpo-44900.w2gpwy.rst Normal file
View file

@ -0,0 +1,7 @@
Add five superinstructions for PEP 659 quickening:
* LOAD_FAST LOAD_FAST
* STORE_FAST LOAD_FAST
* LOAD_FAST LOAD_CONST
* LOAD_CONST LOAD_FAST
* STORE_FAST STORE_FAST

95
Python/ceval.c
View file

@ -1266,16 +1266,21 @@ eval_frame_handle_pending(PyThreadState *tstate)
#define PRE_DISPATCH_GOTO() do { LLTRACE_INSTR(); RECORD_DXPROFILE(); } while (0)
#endif
#define NOTRACE_DISPATCH() \
{ \
frame->f_lasti = INSTR_OFFSET(); \
NEXTOPARG(); \
PRE_DISPATCH_GOTO(); \
DISPATCH_GOTO(); \
}
/* Do interpreter dispatch accounting for tracing and instrumentation */
#define DISPATCH() \
{ \
if (cframe.use_tracing OR_DTRACE_LINE) { \
goto tracing_dispatch; \
} \
frame->f_lasti = INSTR_OFFSET(); \
NEXTOPARG(); \
PRE_DISPATCH_GOTO(); \
DISPATCH_GOTO(); \
NOTRACE_DISPATCH(); \
}
#define CHECK_EVAL_BREAKER() \
@ -1682,11 +1687,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
TARGET(LOAD_FAST): {
PyObject *value = GETLOCAL(oparg);
if (value == NULL) {
format_exc_check_arg(tstate, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(co->co_localsplusnames,
oparg));
goto error;
goto unbound_local_error;
}
Py_INCREF(value);
PUSH(value);
@ -1708,6 +1709,73 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int thr
DISPATCH();
}
TARGET(LOAD_FAST__LOAD_FAST): {
PyObject *value = GETLOCAL(oparg);
if (value == NULL) {
goto unbound_local_error;
}
NEXTOPARG();
Py_INCREF(value);
PUSH(value);
value = GETLOCAL(oparg);
if (value == NULL) {
goto unbound_local_error;
}
Py_INCREF(value);
PUSH(value);
NOTRACE_DISPATCH();
}
TARGET(LOAD_FAST__LOAD_CONST): {
PyObject *value = GETLOCAL(oparg);
if (value == NULL) {
goto unbound_local_error;
}
NEXTOPARG();
Py_INCREF(value);
PUSH(value);
value = GETITEM(consts, oparg);
Py_INCREF(value);
PUSH(value);
NOTRACE_DISPATCH();
}
TARGET(STORE_FAST__LOAD_FAST): {
PyObject *value = POP();
SETLOCAL(oparg, value);
NEXTOPARG();
value = GETLOCAL(oparg);
if (value == NULL) {
goto unbound_local_error;
}
Py_INCREF(value);
PUSH(value);
NOTRACE_DISPATCH();
}
TARGET(STORE_FAST__STORE_FAST): {
PyObject *value = POP();
SETLOCAL(oparg, value);
NEXTOPARG();
value = POP();
SETLOCAL(oparg, value);
NOTRACE_DISPATCH();
}
TARGET(LOAD_CONST__LOAD_FAST): {
PyObject *value = GETITEM(consts, oparg);
NEXTOPARG();
Py_INCREF(value);
PUSH(value);
value = GETLOCAL(oparg);
if (value == NULL) {
goto unbound_local_error;
}
Py_INCREF(value);
PUSH(value);
NOTRACE_DISPATCH();
}
TARGET(POP_TOP): {
PyObject *value = POP();
Py_DECREF(value);
@ -4592,6 +4660,15 @@ MISS_WITH_OPARG_COUNTER(BINARY_SUBSCR)
goto error;
}
unbound_local_error:
{
format_exc_check_arg(tstate, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(co->co_localsplusnames, oparg)
);
goto error;
}
error:
/* Double-check exception status. */
#ifdef NDEBUG

10
Python/opcode_targets.h generated
View file

@ -47,7 +47,7 @@ static void *opcode_targets[256] = {
&&TARGET_STORE_ATTR_SPLIT_KEYS,
&&TARGET_STORE_ATTR_SLOT,
&&TARGET_STORE_ATTR_WITH_HINT,
&&_unknown_opcode,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_WITH_EXCEPT_START,
&&TARGET_GET_AITER,
&&TARGET_GET_ANEXT,
@ -57,7 +57,7 @@ static void *opcode_targets[256] = {
&&TARGET_INPLACE_ADD,
&&TARGET_INPLACE_SUBTRACT,
&&TARGET_INPLACE_MULTIPLY,
&&_unknown_opcode,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_INPLACE_MODULO,
&&TARGET_STORE_SUBSCR,
&&TARGET_DELETE_SUBSCR,
@ -79,14 +79,14 @@ static void *opcode_targets[256] = {
&&TARGET_INPLACE_AND,
&&TARGET_INPLACE_XOR,
&&TARGET_INPLACE_OR,
&&_unknown_opcode,
&&_unknown_opcode,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_LIST_TO_TUPLE,
&&TARGET_RETURN_VALUE,
&&TARGET_IMPORT_STAR,
&&TARGET_SETUP_ANNOTATIONS,
&&TARGET_YIELD_VALUE,
&&_unknown_opcode,
&&TARGET_STORE_FAST__STORE_FAST,
&&_unknown_opcode,
&&TARGET_POP_EXCEPT,
&&TARGET_STORE_NAME,

29
Python/specialize.c
View file

@ -303,6 +303,7 @@ optimize(SpecializedCacheOrInstruction *quickened, int len)
_Py_CODEUNIT *instructions = first_instruction(quickened);
int cache_offset = 0;
int previous_opcode = -1;
int previous_oparg = 0;
for(int i = 0; i < len; i++) {
int opcode = _Py_OPCODE(instructions[i]);
int oparg = _Py_OPARG(instructions[i]);
@ -338,14 +339,32 @@ optimize(SpecializedCacheOrInstruction *quickened, int len)
case JUMP_ABSOLUTE:
instructions[i] = _Py_MAKECODEUNIT(JUMP_ABSOLUTE_QUICK, oparg);
break;
/* Insert superinstructions here
E.g.
case LOAD_FAST:
if (previous_opcode == LOAD_FAST)
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_FAST, oparg);
*/
switch(previous_opcode) {
case LOAD_FAST:
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_FAST, previous_oparg);
break;
case STORE_FAST:
instructions[i-1] = _Py_MAKECODEUNIT(STORE_FAST__LOAD_FAST, previous_oparg);
break;
case LOAD_CONST:
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_CONST__LOAD_FAST, previous_oparg);
break;
}
break;
case STORE_FAST:
if (previous_opcode == STORE_FAST) {
instructions[i-1] = _Py_MAKECODEUNIT(STORE_FAST__STORE_FAST, previous_oparg);
}
break;
case LOAD_CONST:
if (previous_opcode == LOAD_FAST) {
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_CONST, previous_oparg);
}
break;
}
previous_opcode = opcode;
previous_oparg = oparg;
}
}
assert(cache_offset+1 == get_cache_count(quickened));