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gh-98831: rewrite UNPACK_EX, UNPACK_SEQUENCE, UNPACK_SEQUENCE_TWO_TUPLE in the instruction definition DSL by iritkatriel · Pull Request #101641 · python/cpython · GitHub

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gh-98831: rewrite UNPACK_EX, UNPACK_SEQUENCE, UNPACK_SEQUENCE_TWO_TUPLE in the instruction definition DSL #101641

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Merged
iritkatriel merged 4 commits into from
Feb 7, 2023
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Merged

gh-98831: rewrite UNPACK_EX, UNPACK_SEQUENCE, UNPACK_SEQUENCE_TWO_TUPLE in the instruction definition DSL #101641

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4631aa0
UNPACK_EX, UNPACK_SEQUENCE, UNPACK_SEQUENCE_TWO_TUPLE
iritkatriel Feb 7, 2023
e0accbb
Merge branch 'main' into unpack
iritkatriel Feb 7, 2023
76591af
fix cache effect of UNPACK_SEQUENCE_TWO_TUPLE
iritkatriel Feb 7, 2023
2077077
Merge branch 'main' into unpack
iritkatriel Feb 7, 2023
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37 changes: 11 additions & 26 deletions Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -859,41 +859,31 @@ dummy_func(
}
}

// stack effect: (__0 -- __array[oparg])
inst(UNPACK_SEQUENCE) {
inst(UNPACK_SEQUENCE, (unused/1, seq -- unused[oparg])) {
#if ENABLE_SPECIALIZATION
_PyUnpackSequenceCache *cache = (_PyUnpackSequenceCache *)next_instr;
if (ADAPTIVE_COUNTER_IS_ZERO(cache->counter)) {
assert(cframe.use_tracing == 0);
PyObject *seq = TOP();
next_instr--;
_Py_Specialize_UnpackSequence(seq, next_instr, oparg);
DISPATCH_SAME_OPARG();
}
STAT_INC(UNPACK_SEQUENCE, deferred);
DECREMENT_ADAPTIVE_COUNTER(cache->counter);
#endif /* ENABLE_SPECIALIZATION */
PyObject *seq = POP();
PyObject **top = stack_pointer + oparg;
if (!unpack_iterable(tstate, seq, oparg, -1, top)) {
Py_DECREF(seq);
goto error;
}
STACK_GROW(oparg);
PyObject **top = stack_pointer + oparg - 1;
int res = unpack_iterable(tstate, seq, oparg, -1, top);
Py_DECREF(seq);
JUMPBY(INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE);
ERROR_IF(res == 0, error);
}

// stack effect: (__0 -- __array[oparg])
inst(UNPACK_SEQUENCE_TWO_TUPLE) {
PyObject *seq = TOP();
inst(UNPACK_SEQUENCE_TWO_TUPLE, (unused/1, seq -- v1, v0)) {
DEOPT_IF(!PyTuple_CheckExact(seq), UNPACK_SEQUENCE);
DEOPT_IF(PyTuple_GET_SIZE(seq) != 2, UNPACK_SEQUENCE);
STAT_INC(UNPACK_SEQUENCE, hit);
SET_TOP(Py_NewRef(PyTuple_GET_ITEM(seq, 1)));
PUSH(Py_NewRef(PyTuple_GET_ITEM(seq, 0)));
v1 = Py_NewRef(PyTuple_GET_ITEM(seq, 1));
v0 = Py_NewRef(PyTuple_GET_ITEM(seq, 0));
Py_DECREF(seq);
JUMPBY(INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE);
}

// stack effect: (__0 -- __array[oparg])
Expand Down Expand Up @@ -926,17 +916,12 @@ dummy_func(
JUMPBY(INLINE_CACHE_ENTRIES_UNPACK_SEQUENCE);
}

// error: UNPACK_EX has irregular stack effect
inst(UNPACK_EX) {
inst(UNPACK_EX, (seq -- unused[oparg & 0xFF], unused, unused[oparg >> 8])) {
int totalargs = 1 + (oparg & 0xFF) + (oparg >> 8);
PyObject *seq = POP();
PyObject **top = stack_pointer + totalargs;
if (!unpack_iterable(tstate, seq, oparg & 0xFF, oparg >> 8, top)) {
Py_DECREF(seq);
goto error;
}
STACK_GROW(totalargs);
PyObject **top = stack_pointer + totalargs - 1;
int res = unpack_iterable(tstate, seq, oparg & 0xFF, oparg >> 8, top);
Py_DECREF(seq);
ERROR_IF(res == 0, error);
}

family(store_attr, INLINE_CACHE_ENTRIES_STORE_ATTR) = {
Expand Down
41 changes: 21 additions & 20 deletions Python/generated_cases.c.h
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16 changes: 8 additions & 8 deletions Python/opcode_metadata.h
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Original file line number Diff line number Diff line change
Expand Up @@ -121,15 +121,15 @@ _PyOpcode_num_popped(int opcode, int oparg, bool jump) {
case DELETE_NAME:
return 0;
case UNPACK_SEQUENCE:
return -1;
return 1;
case UNPACK_SEQUENCE_TWO_TUPLE:
return -1;
return 1;
case UNPACK_SEQUENCE_TUPLE:
return -1;
case UNPACK_SEQUENCE_LIST:
return -1;
case UNPACK_EX:
return -1;
return 1;
case STORE_ATTR:
return 2;
case DELETE_ATTR:
Expand Down Expand Up @@ -467,15 +467,15 @@ _PyOpcode_num_pushed(int opcode, int oparg, bool jump) {
case DELETE_NAME:
return 0;
case UNPACK_SEQUENCE:
return -1;
return oparg;
case UNPACK_SEQUENCE_TWO_TUPLE:
return -1;
return 2;
case UNPACK_SEQUENCE_TUPLE:
return -1;
case UNPACK_SEQUENCE_LIST:
return -1;
case UNPACK_EX:
return -1;
return (oparg & 0xFF) + (oparg >> 8) + 1;
case STORE_ATTR:
return 0;
case DELETE_ATTR:
Expand Down Expand Up @@ -759,8 +759,8 @@ struct opcode_metadata {
[LOAD_BUILD_CLASS] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IX },
[STORE_NAME] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
[DELETE_NAME] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
[UNPACK_SEQUENCE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
[UNPACK_SEQUENCE_TWO_TUPLE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IX },
[UNPACK_SEQUENCE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IBC },
[UNPACK_SEQUENCE_TWO_TUPLE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IXC },
[UNPACK_SEQUENCE_TUPLE] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
[UNPACK_SEQUENCE_LIST] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
[UNPACK_EX] = { DIR_NONE, DIR_NONE, DIR_NONE, true, INSTR_FMT_IB },
Expand Down
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