[PATCH] D148198: [ReachingDefs] make ReachingDefDefaultVal smaller

[Jon Roelofs via Phabricator via llvm-commits]

jroelofs added a comment.

In D148198#4264234 <https://reviews.llvm.org/D148198#4264234>, @yubing wrote:

> @craig.topper hi, Craig. why we don't set it as std::numeric_limits<int>::min() previously?

I think it can only go as small as `-(1 << 30)`, since the pointer traits in `ReachingDef` takes the last two bits.

We have seen values between `-(1<<21)` and `-(1<<20)` in some workloads tripping the `Defs must be sorted and unique` assertion, so it may be prudent to set it to at least `-(1<<22)`.


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  https://reviews.llvm.org/D148198/new/

https://reviews.llvm.org/D148198