In upstream mlir, the dialect conversion infrastructure is used for
lowering from one dialect to another: the passes are of the form
XToYPass. Whereas, transformations within the same dialect tend to use
applyPatternsAndFoldGreedily.
In this case, the full complexity of applyPatternsAndFoldGreedily isn't
needed so we can get away with the simpler applyOpPatternsAndFold.
This change was suggested by @jeanPerier
Differential Revision: https://reviews.llvm.org/D150853
Some functions (e.g. the main function) end with a call to the STOP
statement instead of a func.return. This is lowered as a call to the
stop runtime function followed by a fir.unreachable. fir.unreachable is
a terminator and so this can cause functions to have no func.return.
The stack arrays pass looks to see which heap allocations have always
been freed by the time a function returns. Without any returns, the pass
does not detect any freed allocations. This patch changes this behaviour
so that fir.unreachable is checked as well as func.return.
This allows 15 heap allocations for array temporaries in spec2017
exchange2's main function to be moved to the stack.
Differential Revision: https://reviews.llvm.org/D143918
This pass implements the `-fstack-arrays` flag. See the RFC in
`flang/docs/fstack-arrays.md` for more information.
Differential revision: https://reviews.llvm.org/D140415
