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Current inliner disables inlining when the caller is in a region with single block trait, while the callee function contains multiple blocks. the SingleBlock trait is used in operations such as do/while loop, for example fir.do_loop, fir.iterate_while and fir.if. Typically, calls within loops are good candidates for inlining. However, functions with multiple blocks are also common. for example, any function with "if () then return" will result in multiple blocks in MLIR. This change gives the flexibility of a customized inliner to handle such cases. doClone: clones instructions and other information from the callee function into the caller function. . canHandleMultipleBlocks: checks if functions with multiple blocks can be inlined into a region with the SingleBlock trait. The default behavior of the inliner remains unchanged. --------- Co-authored-by: jeanPerier <jean.perier.polytechnique@gmail.com> Co-authored-by: Mehdi Amini <joker.eph@gmail.com>