Don't wrap singleton ir.Values with tuples during HLO lowering. #22211
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This has been a constant source of mistakes for me: where to add/remove the tuples. Thanks! |
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In general a JAX value might correspond to multiple HLO values, which is why the HLO lowering represents each value as a tuple of zero or more ir.Values. However, the common case is that there is exactly one value, and almost all such lists are singletons. To reduce the number of singleton list and tuple objects allocated during MLIR lowering, instead represent singleton values as unwrapped ir.Values, and only use a tuple if there is not exactly one ir.Value backing a JAX value.
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This is similar to google#22211, but for MLIR types instead of MLIR values.
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In general a JAX value might correspond to multiple HLO values, which is why the HLO lowering represents each value ad a tuple of zero or more ir.Values. However, the common case is that there is exactly one value, and almost all such lists are singletons.
To reduce the number of singleton list and tuple objects allocated during MLIR lowering, instead represent singleton values as unwrapped ir.Values, and only use a tuple if there is not exactly one ir.Value backing a JAX value.