F2dace/feature unroll loops #2212
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This PR introduces a new AST desugaring transformation
unroll_loops().The transformation unrolls loops with constant loop bounds, giving
_track_local_consts()more room to propagate values and prune temporary variables. This transformation is disabled by default, but can be enabled via theunroll_loops: intcommand line argument to thecreate_preprocessed_asttool. Passing a positive non-zero integer n to the argument enables unrolling loops with at most n iterations. Passing a negative number disables the check and unrolls all loops with constant bounds. Passing zero (default) disables the transformation.Only loops with integer literal bounds are transformed. Additionally, loops containing (nested)
CYCLEorEXITstatements are ignored.