[llvm] [TailDuplicator] Only duplicate the blocks containing computed gotos (PR #114990)

[via llvm-commits]

DianQK wrote:

> Please don't link to gcc source code in commit messages.

Removed.

> I think it might make sense to try to pursue a more general solution here... can we simplify the CFG while still keeping the benefit of taildup? Maybe introduce a fake BB into the CFG or something. But special-casing indirectbr seems okay short-term.

I think the current IR is already as you want: https://llvm.godbolt.org/z/o5YT191P9.
There’s only a single merged indirectbr here.


https://github.com/llvm/llvm-project/pull/114990