[llvm] [TailDuplicator] Do not restrict the computed gotos (PR #114990)

[via llvm-commits]

bgra8 wrote:

> Could you reproduce -mllvm -tail-dup-pred-size=100000 before this PR?

Yes, it reproduces with that setting. So now we know the issue is most likely caused by circumventing of the `tail-dup-pred-size` check for `computed gotos` in this PR. So this is the correct culprit for the issue we're seeing.

It is very likely that it was a known fact that `tail-dup-pred-size` causes similar issue and that's why it was configured with a number (I confirmed that for the case I'm looking at 128 is the value for this parameter that leads to the compiler to increase the memory usage significantly over 512MB)

So circumventing the check for `tail-dup-pred-size` now opens the door to the same class of issues that the argument was supposed to control.

Can you please add another feature to allow controlling this circumventing for computed gotos?



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