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(#149809)
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This is a code cleanup. Update a few places in MLIR that should use
`hasSingleElement`/`getSingleElement`.
Note: `hasSingleElement` is faster than `.getSize() == 1` when it is
used with linked lists etc.
Depends on #131508.
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CallableOpInterface
Functions are always callable operations and thus every operation
implementing the `FunctionOpInterface` also implements the
`CallableOpInterface`. The only exception was the FuncOp in the toy
example. To make implementation of the `FunctionOpInterface` easier,
this commit lets `FunctionOpInterface` inherit from
`CallableOpInterface` and merges some of their methods. More precisely,
the `CallableOpInterface` has methods to get the argument and result
attributes and a method to get the result types of the callable region.
These methods are always implemented the same way as their analogues in
`FunctionOpInterface` and thus this commit moves all the argument and
result attribute handling methods to the callable interface as well as
the methods to get the argument and result types. The
`FuntionOpInterface` then does not have to declare them as well, but
just inherits them from the `CallableOpInterface`.
Adding the inheritance relation also required to move the
`FunctionOpInterface` from the IR directory to the Interfaces directory
since IR should not depend on Interfaces.
Reviewed By: jpienaar, springerm
Differential Revision: https://reviews.llvm.org/D157988
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This commit introduces an instantiation of LLVM's LoopInfo for CFGs in
MLIR. To test the LoopInfo, a test pass is added the checks the analysis
results for a set of CFGs.
Reviewed By: ftynse
Differential Revision: https://reviews.llvm.org/D147323
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