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GH-115819: Eliminate Boolean guards when value is known (GH-116355)

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Mark Shannon 2024-03-05 15:06:00 +00:00 • committed by GitHub
parent c91bdf86ef
commit 0c81ce1360
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6 changed files with 102 additions and 2 deletions
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36
Python/optimizer_cases.c.h generated
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@ -1803,21 +1803,57 @@
/* _INSTRUMENTED_POP_JUMP_IF_NOT_NONE is not a viable micro-op for tier 2 */
case _GUARD_IS_TRUE_POP: {
_Py_UopsSymbol *flag;
flag = stack_pointer[-1];
if (sym_is_const(flag)) {
PyObject *value = sym_get_const(flag);
assert(value != NULL);
eliminate_pop_guard(this_instr, value != Py_True);
}
stack_pointer += -1;
break;
}
case _GUARD_IS_FALSE_POP: {
_Py_UopsSymbol *flag;
flag = stack_pointer[-1];
if (sym_is_const(flag)) {
PyObject *value = sym_get_const(flag);
assert(value != NULL);
eliminate_pop_guard(this_instr, value != Py_False);
}
stack_pointer += -1;
break;
}
case _GUARD_IS_NONE_POP: {
_Py_UopsSymbol *flag;
flag = stack_pointer[-1];
if (sym_is_const(flag)) {
PyObject *value = sym_get_const(flag);
assert(value != NULL);
eliminate_pop_guard(this_instr, !Py_IsNone(value));
}
else if (sym_has_type(flag)) {
assert(!sym_matches_type(flag, &_PyNone_Type));
eliminate_pop_guard(this_instr, true);
}
stack_pointer += -1;
break;
}
case _GUARD_IS_NOT_NONE_POP: {
_Py_UopsSymbol *flag;
flag = stack_pointer[-1];
if (sym_is_const(flag)) {
PyObject *value = sym_get_const(flag);
assert(value != NULL);
eliminate_pop_guard(this_instr, Py_IsNone(value));
}
else if (sym_has_type(flag)) {
assert(!sym_matches_type(flag, &_PyNone_Type));
eliminate_pop_guard(this_instr, false);
}
stack_pointer += -1;
break;
}