thakis added a comment.

In D137269#3925163 <https://reviews.llvm.org/D137269#3925163>, @thakis wrote:

> Heads-up: This very visibly broke web page rendering in Chromium (but only 
> when using LTO) (https://crbug.com/1383873) . Not clear yet if this exposed 
> UB on our end or not.

After looking at this for a while, this does look like a miscompile. I filed 
https://github.com/llvm/llvm-project/issues/59376 for this, with a somewhat 
reduced repro (down to a single TU, but the TU is still fairly large.)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137269/new/

https://reviews.llvm.org/D137269

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