[PATCH] D89479: [SimplifyCFG] Be more conservative when speculating in loops. (WIP)

Thu Oct 15 09:23:59 PDT 2020

fhahn added a comment.

In D89479#2332577 <https://reviews.llvm.org/D89479#2332577>, @spatel wrote:

> Do you know if there is any overlap in this and what I am proposing with D89461 <https://reviews.llvm.org/D89461> (and also if we remove or adjust the isCheapToSpeculateCttz() calls that are still there)?

Hm, yes I think we could also solve this by just making CTLZ not cheap to speculate on X86 I guess? I think the current implementation just checks for `LZCNT`.

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https://reviews.llvm.org/D89479