gh-109329: Count tier2 miss opcodes

[mdboom]

This records the number of times a specific uop causes a DEOPT (in the same way this is already done for Tier 1). The summarize_stats.py script already supports the display, by virtue of reusing the code from Tier 1.

Marked as draft because it is necessarily built on #110398 which should be merged first.

• Issue: Adds stats for the tier 2 optimizer #109329

[markshannon]

Looks like a useful feature. Do you have example output for this?

[gvanrossum]

Mark put in a question, I can merge once you've answered that.

[gvanrossum]

I would have named this arg opcode (or OPCODE, per recent Discourse thread), since to me opname is a variable of type char * giving the opcode's name; opcode is the (named) constant representing the opcode, which it is. (I did a small double take when I saw assert(opname < 512). :-) But it's too late, and opname is used in several places above as well, so let's keep it this way.

[mdboom]

Looks like a useful feature. Do you have example output for this?

Here's an example from the raytrace benchmark:

Name	Count	Self	Cumulative	Miss ratio
_SET_IP	487,881,600	22.3%	22.3%
_GUARD_TYPE_VERSION	184,373,760	8.4%	30.7%	2.2%
LOAD_FAST	153,382,980	7.0%	37.7%
_CHECK_MANAGED_OBJECT_HAS_VALUES	100,250,880	4.6%	42.3%
_LOAD_ATTR_INSTANCE_VALUE	100,250,880	4.6%	46.8%
_GUARD_DORV_VALUES_INST_ATTR_FROM_DICT	60,593,280	2.8%	49.6%
_GUARD_KEYS_VERSION	60,593,280	2.8%	52.4%
_LOAD_ATTR_METHOD_WITH_VALUES	60,593,280	2.8%	55.1%
RESUME_CHECK	60,407,040	2.8%	57.9%
_CHECK_PEP_523	60,407,040	2.8%	60.6%
_CHECK_FUNCTION_EXACT_ARGS	60,407,040	2.8%	63.4%
_CHECK_STACK_SPACE	60,407,040	2.8%	66.2%
_INIT_CALL_PY_EXACT_ARGS	60,407,040	2.8%	68.9%
_PUSH_FRAME	60,407,040	2.8%	71.7%
_SAVE_RETURN_OFFSET	60,407,040	2.8%	74.4%
_POP_FRAME	58,813,440	2.7%	77.1%
COMPARE_OP_INT	40,684,800	1.9%	79.0%
_POP_JUMP_IF_FALSE	40,308,480	1.8%	80.8%
_GUARD_GLOBALS_VERSION	40,120,320	1.8%	82.6%
_LOAD_GLOBAL_MODULE	40,120,320	1.8%	84.5%
_CHECK_ATTR_CLASS	39,548,160	1.8%	86.3%
_LOAD_ATTR_CLASS	39,548,160	1.8%	88.1%
_POP_JUMP_IF_TRUE	31,681,920	1.4%	89.5%
_ITER_CHECK_LIST	28,510,080	1.3%	90.8%
_IS_ITER_EXHAUSTED_LIST	28,510,080	1.3%	92.1%
STORE_FAST	27,071,940	1.2%	93.4%
_ITER_NEXT_LIST	25,484,160	1.2%	94.5%
POP_TOP	22,312,380	1.0%	95.5%
LOAD_CONST	21,757,440	1.0%	96.5%
_JUMP_TO_TOP	20,192,640	0.9%	97.5%
_GUARD_DORV_VALUES	19,459,200	0.9%	98.3%
_STORE_ATTR_INSTANCE_VALUE	19,459,200	0.9%	99.2%
_EXIT_TRACE	5,406,720	0.2%	99.5%
COMPARE_OP	1,758,720	0.1%	99.6%
LOAD_ATTR	1,543,680	0.1%	99.6%
CALL_METHOD_DESCRIPTOR_FAST	1,353,600	0.1%	99.7%
_ITER_CHECK_RANGE	1,036,800	0.0%	99.7%
_IS_ITER_EXHAUSTED_RANGE	1,036,800	0.0%	99.8%
_ITER_NEXT_RANGE	1,019,460	0.0%	99.8%
TO_BOOL_BOOL	768,000	0.0%	99.9%
_GUARD_BOTH_INT	752,640	0.0%	99.9%
BINARY_OP	382,080	0.0%	99.9%
BINARY_SUBSCR	376,320	0.0%	99.9%
_BINARY_OP_MULTIPLY_INT	376,320	0.0%	100.0%
_BINARY_OP_ADD_INT	376,320	0.0%	100.0%
GET_ITER	259,200	0.0%	100.0%
_CHECK_CALL_BOUND_METHOD_EXACT_ARGS	190,080	0.0%	100.0%
_INIT_CALL_BOUND_METHOD_EXACT_ARGS	190,080	0.0%	100.0%
PUSH_NULL	1,860	0.0%	100.0%