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gh-131798: JIT: Split CALL_ISINSTANCE into several uops #133339

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Merged
merged 9 commits into from
May 8, 2025
Merged

gh-131798: JIT: Split CALL_ISINSTANCE into several uops #133339

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43ec167
Split CALL_ISIINSTANCE into several uops
tomasr8 May 3, 2025
0ab70a9
Add news entry
tomasr8 May 3, 2025
900472a
Close all stackrefs
tomasr8 May 3, 2025
6f49dca
Rename to _GUARD_THIRD_NULL
tomasr8 May 3, 2025
8ba53c3
Unpack args array into separate stack variables
tomasr8 May 3, 2025
6e11442
Fix tests
tomasr8 May 8, 2025
be50e24
Rename parameter
tomasr8 May 8, 2025
ec61bc5
Merge remote-tracking branch 'upstream/main' into jit-split-isinstance
tomasr8 May 8, 2025
b0b31dd
Regen cases
tomasr8 May 8, 2025
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4 changes: 2 additions & 2 deletions Include/internal/pycore_opcode_metadata.h
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6 changes: 3 additions & 3 deletions Include/internal/pycore_uop_metadata.h
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15 changes: 7 additions & 8 deletions Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4353,26 +4353,25 @@ dummy_func(
res = PyStackRef_FromPyObjectSteal(res_o);
}

op(_GUARD_CALLABLE_ISINSTANCE, (callable, unused, unused[oparg] -- callable, unused, unused[oparg])) {
op(_GUARD_CALLABLE_ISINSTANCE, (callable, unused, unused, unused -- callable, unused, unused, unused)) {
PyObject *callable_o = PyStackRef_AsPyObjectBorrow(callable);
PyInterpreterState *interp = tstate->interp;
DEOPT_IF(callable_o != interp->callable_cache.isinstance);
}

op(_CALL_ISINSTANCE, (callable, null, args[oparg] -- res)) {
op(_CALL_ISINSTANCE, (callable, null, inst_, cls -- res)) {
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I don't love the trailing underscore. Not a huge deal, but maybe just rename to instance or obj or something ?

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I renamed it to instance in be50e24

/* isinstance(o, o2) */
assert(oparg == 2);
STAT_INC(CALL, hit);
PyObject *inst = PyStackRef_AsPyObjectBorrow(args[0]);
PyObject *cls = PyStackRef_AsPyObjectBorrow(args[1]);
int retval = PyObject_IsInstance(inst, cls);
PyObject *inst_o = PyStackRef_AsPyObjectBorrow(inst_);
PyObject *cls_o = PyStackRef_AsPyObjectBorrow(cls);
int retval = PyObject_IsInstance(inst_o, cls_o);
if (retval < 0) {
ERROR_NO_POP();
}
(void)null; // Silence compiler warnings about unused variables
PyStackRef_CLOSE(cls);
PyStackRef_CLOSE(inst_);
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Interesting that with named stackrefs it won't let me do this:

DEAD(null);
PyStackRef_CLOSE(cls);
PyStackRef_CLOSE(inst_);

(the error is SyntaxError: Input 'null' is not live, but 'inst_' is)
While with the previous args version this was fine:

DEAD(null);
PyStackRef_CLOSE(args[0]);
PyStackRef_CLOSE(args[1]);

I guess the cases generator can't reason about arrays? Another reason to use named stackrefs instead :)

DEAD(null);
PyStackRef_CLOSE(args[0]);
PyStackRef_CLOSE(args[1]);
PyStackRef_CLOSE(callable);
res = retval ? PyStackRef_True : PyStackRef_False;
assert((!PyStackRef_IsNull(res)) ^ (_PyErr_Occurred(tstate) != NULL));
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31 changes: 17 additions & 14 deletions Python/executor_cases.c.h
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26 changes: 15 additions & 11 deletions Python/generated_cases.c.h
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2 changes: 1 addition & 1 deletion Python/optimizer_bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,7 +1095,7 @@ dummy_func(void) {
res = sym_new_type(ctx, &PyLong_Type);
}

op(_GUARD_CALLABLE_ISINSTANCE, (callable, unused, unused[oparg] -- callable, unused, unused[oparg])) {
op(_GUARD_CALLABLE_ISINSTANCE, (callable, unused, unused, unused -- callable, unused, unused, unused)) {
PyObject *isinstance = _PyInterpreterState_GET()->callable_cache.isinstance;
if (sym_get_const(ctx, callable) == isinstance) {
REPLACE_OP(this_instr, _NOP, 0, 0);
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6 changes: 3 additions & 3 deletions Python/optimizer_cases.c.h
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