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Sam Tebbs f7f437fb68 [ARM] Add a pass that re-arranges blocks when there is a backwards WLS branch
Blocks can be laid out such that a t2WhileLoopStart branches backwards. This is forbidden by the architecture and so it fails to be converted into a low-overhead loop. This new pass checks for these cases and moves the target block, fixing any fall-through that would then be broken.

Differential Revision: https://reviews.llvm.org/D92385
2021-01-13 17:23:00 +00:00
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