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The findLoopPreheader function will currently not find a preheader if it branches to multiple different loop headers. This patch adds an option to relax that, allowing ARMLowOverheadLoops to process more loops successfully. This helps with WhileLoopStart setup instructions that can branch/fallthrough to the low overhead loop and to branch to a separate loop from the same preheader (but I don't believe it is possible for both loops to be low overhead loops). Differential Revision: https://reviews.llvm.org/D102747 |
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