chandlerc wrote:

> > @dyung -- Ok, my latest attempt to work around these MSVC issues is now 
> > pushed to this PR. It also contains a commit of specifically debugging 
> > hacks to try and extract more information from any failure here. If you 
> > could try doing another build with the latest commit 
> > ([2ec750d](https://github.com/llvm/llvm-project/pull/120534/commits/2ec750d0105e1d4d52791f85293d16d28f6ccbd8))
> >  in this PR, would be very interested in how it works.
> 
> ```
> fatal error: error in backend: Name for __nvvm_vote_all is: ''!!!
> ```
> I don't see any instances of the `__builtin_ia32_packsswb128` from a quick 
> search of the test log.

This is awesome news!

It seems the last change was enough and gives me a strong guess as to the bug.

It does mean MSVC is miscompiling long string literals, so when you can 
upgrade, I would. And we should try to exclude these MSVC versions when we can.

But I may be able to work around more of these, stay tuned for some more 
updates.

> 
> Here is a compressed copy of the test log file:    
> [log_test.2ec750d0105e1d4d52791f85293d16d28f6ccbd8.zip](https://www.dropbox.com/scl/fi/60gizuhvi85lz8jxw44t9/log_test.2ec750d0105e1d4d52791f85293d16d28f6ccbd8.zip?rlkey=esic3xnyg4i11rjzuc9i0cr2a&dl=0)



https://github.com/llvm/llvm-project/pull/120534
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