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This allows to define custom splitters, which is interesting for non-MLIR inputs and outputs to `mlir-translate`. For example, one may use `; -----` as a splitter of `.ll` files. The splitters are now passed as arguments into `splitAndProcessBuffer`, the input splitter defaulting to the previous default (`// -----`) and the output splitter defaulting to the empty string, which also corresponds to the previous default. The behavior of the input split marker should not change at all; however, outputs now have one new line *more* than before if there is no splitter (old: `insertMarkerInOutput = false`, new: `outputSplitMarker = ""`) and one new line *less* if there is one. The value of the input splitter is exposed as a command line options of `mlir-translate` and other tools as an optional value to the previously existing flag `-split-input-file`, which defaults to the default splitter if not specified; the value of the output splitter is exposed with the new `-output-split-marker`, which default to the empty string in `mlir-translate` and the default splitter in the other tools. In short, the previous usage or omission of the flags should result in previous behavior (modulo the new lines mentioned before).
The LLVM Compiler Infrastructure
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