Canonicalize triton::ReduceOp select(cmpf) patterns to min/max operations#11
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enjustli wants to merge 1 commit intofacebookincubator:mainfrom
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Canonicalize triton::ReduceOp select(cmpf) patterns to min/max operations#11enjustli wants to merge 1 commit intofacebookincubator:mainfrom
enjustli wants to merge 1 commit intofacebookincubator:mainfrom
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fork from microsoft/triton-shared#361
This PR introduces a pattern rewrite that simplifies triton::ReduceOp bodies containing arith.select operations based on floating-point comparisons. The transformation replaces select-based logic with equivalent min/max operations, improving IR canonicalization and enabling further optimization.
Supported Transformations:
select(cmpf ogt a, b), a, b → arith.maxf(a, b)
select(cmpf olt a, b), a, b → arith.minf(a, b)
select((cmpf ogt a, b) || cmpf une a, a), a, b → arith.maximumf(a, b)
select((cmpf olt a, b) || cmpf une a, a), a, b → arith.minimumf(a, b)
Applying this transformation before the ReduceOp converter runs allows the natural lowering of tt.reduce to linalg.reduce; the motivational use case was from a torch-inductor spit out Triton kernel which consisted of this complex pattern in the reduction body and did not allow the ReduceOp to get lowered to the linalg dialect.