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It is possible to have a fallthrough MBB prior to MBB placement. The original addition of the BB would result in reordering the BB as not preceding the successor. Because of the fallthrough nature of the BB, we could end up executing incorrect code or even a constant pool island! Insert the spliced BB into the same location to avoid that. Thanks to Tim Northover for invaluable hints and Fiora for the discussion on what may have been occurring! llvm-svn: 264454 |
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