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GH-113710: Improve _SET_IP and _CHECK_VALIDITY (GH-115248)

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Mark Shannon 2024-02-13 16:28:19 +00:00 • committed by GitHub
parent de07941729
commit 681778c56a
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7 changed files with 79 additions and 35 deletions
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10
Python/bytecodes.c
View file

@ -4037,10 +4037,9 @@ dummy_func(
CHECK_EVAL_BREAKER();
}
op(_SET_IP, (--)) {
op(_SET_IP, (instr_ptr/4 --)) {
TIER_TWO_ONLY
// TODO: Put the code pointer in `operand` to avoid indirection via `frame`
frame->instr_ptr = _PyCode_CODE(_PyFrame_GetCode(frame)) + oparg;
frame->instr_ptr = (_Py_CODEUNIT *)instr_ptr;
}
op(_SAVE_RETURN_OFFSET, (--)) {
@ -4100,6 +4099,11 @@ dummy_func(
exe->count++;
}
op(_CHECK_VALIDITY_AND_SET_IP, (instr_ptr/4 --)) {
TIER_TWO_ONLY
DEOPT_IF(!current_executor->vm_data.valid);
frame->instr_ptr = (_Py_CODEUNIT *)instr_ptr;
}
// END BYTECODES //

13
Python/executor_cases.c.h generated
View file

@ -3360,10 +3360,9 @@
}
case _SET_IP: {
oparg = CURRENT_OPARG();
PyObject *instr_ptr = (PyObject *)CURRENT_OPERAND();
TIER_TWO_ONLY
// TODO: Put the code pointer in `operand` to avoid indirection via `frame`
frame->instr_ptr = _PyCode_CODE(_PyFrame_GetCode(frame)) + oparg;
frame->instr_ptr = (_Py_CODEUNIT *)instr_ptr;
break;
}
@ -3459,4 +3458,12 @@
break;
}
case _CHECK_VALIDITY_AND_SET_IP: {
PyObject *instr_ptr = (PyObject *)CURRENT_OPERAND();
TIER_TWO_ONLY
if (!current_executor->vm_data.valid) goto deoptimize;
frame->instr_ptr = (_Py_CODEUNIT *)instr_ptr;
break;
}
#undef TIER_TWO

5
Python/optimizer.c
View file

@ -432,9 +432,8 @@ translate_bytecode_to_trace(
top: // Jump here after _PUSH_FRAME or likely branches
for (;;) {
target = INSTR_IP(instr, code);
RESERVE_RAW(3, "epilogue"); // Always need space for _SET_IP, _CHECK_VALIDITY and _EXIT_TRACE
ADD_TO_TRACE(_SET_IP, target, 0, target);
ADD_TO_TRACE(_CHECK_VALIDITY, 0, 0, target);
RESERVE_RAW(2, "epilogue"); // Always need space for _SET_IP, _CHECK_VALIDITY and _EXIT_TRACE
ADD_TO_TRACE(_CHECK_VALIDITY_AND_SET_IP, 0, (uintptr_t)instr, target);
uint32_t opcode = instr->op.code;
uint32_t oparg = instr->op.arg;

75
Python/optimizer_analysis.c
View file

@ -652,35 +652,62 @@ error:
static void
remove_unneeded_uops(_PyUOpInstruction *buffer, int buffer_size)
{
/* Remove _SET_IP and _CHECK_VALIDITY where possible.
* _SET_IP is needed if the following instruction escapes or
* could error. _CHECK_VALIDITY is needed if the previous
* instruction could have escaped. */
int last_set_ip = -1;
bool maybe_invalid = false;
bool may_have_escaped = false;
for (int pc = 0; pc < buffer_size; pc++) {
int opcode = buffer[pc].opcode;
if (opcode == _SET_IP) {
buffer[pc].opcode = NOP;
last_set_ip = pc;
}
else if (opcode == _CHECK_VALIDITY) {
if (maybe_invalid) {
maybe_invalid = false;
}
else {
switch (opcode) {
case _SET_IP:
buffer[pc].opcode = NOP;
}
}
else if (op_is_end(opcode)) {
break;
}
else {
if (_PyUop_Flags[opcode] & HAS_ESCAPES_FLAG) {
maybe_invalid = true;
if (last_set_ip >= 0) {
buffer[last_set_ip].opcode = _SET_IP;
last_set_ip = pc;
break;
case _CHECK_VALIDITY:
if (may_have_escaped) {
may_have_escaped = false;
}
}
if ((_PyUop_Flags[opcode] & HAS_ERROR_FLAG) || opcode == _PUSH_FRAME) {
if (last_set_ip >= 0) {
buffer[last_set_ip].opcode = _SET_IP;
else {
buffer[pc].opcode = NOP;
}
break;
case _CHECK_VALIDITY_AND_SET_IP:
if (may_have_escaped) {
may_have_escaped = false;
buffer[pc].opcode = _CHECK_VALIDITY;
}
else {
buffer[pc].opcode = NOP;
}
last_set_ip = pc;
break;
case _JUMP_TO_TOP:
case _EXIT_TRACE:
return;
default:
{
bool needs_ip = false;
if (_PyUop_Flags[opcode] & HAS_ESCAPES_FLAG) {
needs_ip = true;
may_have_escaped = true;
}
if (_PyUop_Flags[opcode] & HAS_ERROR_FLAG) {
needs_ip = true;
}
if (opcode == _PUSH_FRAME) {
needs_ip = true;
}
if (needs_ip && last_set_ip >= 0) {
if (buffer[last_set_ip].opcode == _CHECK_VALIDITY) {
buffer[last_set_ip].opcode = _CHECK_VALIDITY_AND_SET_IP;
}
else {
assert(buffer[last_set_ip].opcode == _NOP);
buffer[last_set_ip].opcode = _SET_IP;
}
last_set_ip = -1;
}
}
}

4
Python/tier2_redundancy_eliminator_cases.c.h
View file

@ -1674,3 +1674,7 @@
break;
}
case _CHECK_VALIDITY_AND_SET_IP: {
break;
}