GH-131798: Narrow types more aggressively in the JIT#134373
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brandtbucher added performance 
tomasr8 reviewed May 20, 2025
Comment on lines -568 to -592
| case _POP_TOP_LOAD_CONST_INLINE: | ||
| case _POP_TOP_LOAD_CONST_INLINE_BORROW: | ||
| last->opcode = _NOP; | ||
| goto optimize_pop_top_again; | ||
| case _COPY: | ||
| case _LOAD_CONST_INLINE: | ||
| case _LOAD_CONST_INLINE_BORROW: | ||
| case _LOAD_FAST: | ||
| case _LOAD_FAST_BORROW: | ||
| case _LOAD_SMALL_INT: | ||
| last->opcode = _NOP; | ||
| if (opcode == _POP_TOP){ | ||
| opcode = buffer[pc].opcode = _NOP; | ||
| } | ||
| else if (opcode == _POP_TOP_LOAD_CONST_INLINE){ | ||
| opcode = buffer[pc].opcode = _LOAD_CONST_INLINE; | ||
| } | ||
| else if (opcode == _POP_TOP_LOAD_CONST_INLINE_BORROW){ | ||
| opcode = buffer[pc].opcode = _LOAD_CONST_INLINE_BORROW; | ||
| } | ||
| else{ | ||
| assert(opcode == _POP_TWO_LOAD_CONST_INLINE_BORROW); | ||
| opcode = buffer[pc].opcode = _POP_TOP_LOAD_CONST_INLINE_BORROW; | ||
| goto optimize_pop_top_again; | ||
| } |
brandtbucher merged commit 2f0570c into python:main 60 checks passed
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lkollar pushed a commit to lkollar/cpython that referenced this pull request May 26, 2025
Pranjal095 pushed a commit to Pranjal095/cpython that referenced this pull request Jul 12, 2025
taegyunkim pushed a commit to taegyunkim/cpython that referenced this pull request Aug 4, 2025
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When setting the type version, we should also set the type (if possible). We can use this to narrow unknown classes to constants in uops like
_CHECK_ATTR_CLASS.(Also, fix a couple of cases where we were incorrectly detecting contradictions when updating some symbols.)