Out of 263 total uops, 155 of these are ignored by the tier two optimizer. These represent over half of all uops by dynamic execution count.

This issue will serve as a checklist for auditing these missing uops, and adding them where they make sense. At first glance, there's quite a bit of potential here... especially around ability to narrow known output types (like _CONTAINS_OP_SET), and the ability to narrow and remove guards on input types (like _BINARY_OP_SUBSCR_LIST_INT). As I'm going through, I'll cross out anything that doesn't seem like it makes sense to add.

First, here are the 53 missing uops that each represent at least 0.1% of all uops executed:

And here are the 102 missing uops that are less than 0.1%. These are less important, but still may net us some wins on individual benchmarks:

Linked PRs

• GH-131798: Allow the JIT to remove more int/float/str guards #131800
• GH-131798: Remove guard for known type in TO_BOOL_STR #131816
• gh-131798: JIT: Narrow the return type of _CONTAINS_OP_SET to bool #132057
• gh-131798: JIT: Narrow the return type of _BINARY_OP_SUBSCR_STR_INT to str #132153
• gh-131798: Allow the JIT to remove an extra _TO_BOOL_BOOL for _CONTAINS_OP_DICT #132269
• GH-131798: Skip self/NULL checks for some known non-methods #132278
• GH-131798: Remove JIT guards for dict, frozenset, list, set, and tuple #132289
• gh-131798: JIT: Split CALL_TYPE_1 into several uops #132419
• gh-131798: Use sym_new_type instead of sym_new_not_null for _BUILD_LIST, _BUILD_SLICE, and _BUILD_MAP #132434
• gh-131798: Use sym_new_type instead of sym_new_not_null for _BUILD_STRING, _BUILD_SET #132564
• gh-131798: JIT: Split CALL_STR_1 into several uops #132849
• gh-131798: JIT: Split CALL_TUPLE_1 into several uops #132851
• gh-131798: JIT: Narrow the return type of _CALL_LEN to int #132940
• gh-131798: JIT: Propagate the result in _BINARY_OP_SUBSCR_TUPLE_INT #133003
• gh-131798: JIT: Narrow the return type of isinstance for some known arguments #133172
• gh-131798: Split CALL_LEN into several uops #133180
• gh-131798: JIT: Split CALL_ISINSTANCE into several uops #133339
• gh-131798: JIT: Narrow the return type of _GET_LEN to int #133345
• gh-131798: JIT: Narrow the return type of _BINARY_SLICE to original container type #133527
• gh-131798: JIT: Assign type to sliced string #133609
• gh-131798: Split CALL_LIST_APPEND into serveral uops #134240
• gh-131798: JIT: Add _POP_CALL_TWO_LOAD_CONST_INLINE_BORROW #134268
• gh-131798: JIT: Optimize _POP_CALL_TWO_LOAD_CONST_INLINE_BORROW #134369
• GH-131798: Narrow types more aggressively in the JIT #134373
• GH-131798: Optimize cached class attributes and methods in the JIT #134403
• gh-131798: JIT: replace _LOAD_SMALL_INT with _LOAD_CONST_INLINE_BORROW #134406
• gh-131798: JIT: Further optimize _CALL_ISINSTANCE for class tuples #134543
• gh-131798: Small improvements to remove_unneeded_uops #134554