[opt] Optimize commutative op working on (explicitly) commuted operands. #3640
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cdleary
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…itly) commuted operands. [opt] Optimize commutative op operating on explicitly commuted operands.
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This seems good to me... but continues to suggest that we may need better pass organization, since I'm not sure this should qualify as "basic". |
ericastor
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Jan 2, 2026
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op(sel(p, cases=[a, b]), sel(p, cases=[b, a]))can be optimized toop(a, b)whenopis commutative.X(sel(p,[a,b]), sel(p,[b,a])) -> X(a,b)(applies to any 2-operand commutative, non-side-effecting op).select_simplification_passhas several 2-way-select peepholes (case swapping / collapsing nested selects / detecting binary select patterns), but not this "commutative op of swapped cases collapses" rule.