Guozhi Wei 1bcb6a3da2 [MBP] Enable duplicating return block to remove jump to return ...

Sometimes LLVM generates branch to return instruction, like PR63227.

It is because in function MachineBlockPlacement::canTailDuplicateUnplacedPreds
we avoid duplicating a BB into another already placed BB to prevent destroying
computed layout. But if the successor BB is a return block, duplicating it will
only reduce taken branches without hurt to any other branches.

Differential Revision: https://reviews.llvm.org/D153093

2023-06-21 18:54:31 +00:00

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