vsavchenko added a comment.

Here is a short summary of the performance testing I conducted across a bunch 
of open-source projects:

|               | vim                              | git                        
      | tmux                                        | redis                     
          | cmake                            | pytorch                          
          | bitcoin                             | protobuf                      
      |
| ------------- | -------------------------------- | 
-------------------------------- | ------------------------------------------- 
| ----------------------------------- | -------------------------------- | 
------------------------------------------ | 
----------------------------------- | ----------------------------------- |
| Time (before) | 20m56s                           | 18m41s                     
      | 11m40s                                      | 1h15m34s                  
          | 30m34s                           | 6h35m18s                         
          | 9m27s                               | 6m03s                         
      |
| Time (after)  | 22m16s                           | 19m58s                     
      | 29m52s                                      | 1h17m32s                  
          | 33m03s                           | 9h46m41s                         
          | 9m33s                               | 6m03s                         
      |
| Delta         | {icon circle color=orange} +6.4% | {icon circle color=orange} 
+6.9% | {icon exclamation-circle color=red} +155.8% | {icon info-circle 
color=blue} +2.6% | {icon circle color=orange} +8.1% | {icon exclamation-circle 
color=red} +48.4% | {icon info-circle color=blue} -1.1% | {icon info-circle 
color=blue} +0.1% |
|

**Time (before)** was measured on a commit before //any of my solver changes//.

This shows that performance tweaks discussed in various `TODO`s are indeed 
required to reduce the hit.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80117/new/

https://reviews.llvm.org/D80117



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