[PATCH] D29153: [BranchFolding] Tail common all identical unreachable blocks

[Reid Kleckner via Phabricator via llvm-commits]

rnk created this revision.

Blocks ending in unreachable are typically cold because they end the
program or throw an exception, so merging them with other identical
blocks is usually profitable because it reduces the size of cold code.
MachineBlockPlacement generally does not arrange to fall through to such
blocks, so commoning these blocks will not introduce additional
unconditional branches.


https://reviews.llvm.org/D29153

Files:
  lib/CodeGen/BranchFolding.cpp
  test/CodeGen/ARM/tail-opts.ll
  test/CodeGen/X86/tail-opts.ll

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