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Commit 9d1a61e6 authored by Philip Reames's avatar Philip Reames
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Do actual DCE in LoopUnroll 

LoopUnroll does a limited DCE pass after unrolling, but if you have a chain of dead instructions, it only deletes the last one. Improve the code to recursively delete all trivially dead instructions.

Differential Revision: https://reviews.llvm.org/D102511
parent b7d1ab75
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