Changes since aec08e:
* Adjust placement of a closing brace so that the general case actually runs. Turns out we had *no* coverage of the switch case. I added one in eae90fd.
* Drop .llvm.loop.* metadata from the new branch as there is no longer a loop to annotate.
Original commit message:
This special cases an unconditional latch and a conditional branch latch exit to improve codegen and test readability. I am hoping to reuse this function in the runtime unroll code, but without this change, the test diffs are far too complex to assess.
This special cases an unconditional latch and a conditional branch latch exit to improve codegen and test readability. I am hoping to reuse this function in the runtime unroll code, but without this change, the test diffs are far too complex to assess.
Loops with irreducible cycles may loop infinitely. Those cannot be
removed, unless the loop/function is marked as mustprogress.
Also discussed in D103382.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D104238
Currently the irreducible cycles in the loops are ignored. The
irreducible cycle may loop infinitely in
irreducible_subloop_no_mustprogress, which is allowed and the loop
should not be removed.
Discussed in D103382.
Philip Reames