[PATCH] D86395: InstCombine transform pattern "(~A & B) ^ A -> (A | B)" added

[Jaydeep Chauhan via Phabricator via llvm-commits]

Jac1494 added a comment.

In D86395#2246162 <https://reviews.llvm.org/D86395#2246162>, @spatel wrote:

>> If my earlier comment about the tests did not make sense, please grep for "thwart" in this test directory to see examples.

A bit of clarification needed(I'm still new to this) @spatel .
Can you please explain what is purpose of this line ?? And is this 42 value conveying something special to codegen pipeline ??

  x = add i32 %p, 42 ; thwart complexity-based canonicalization

And How to create this. ??  Because I have tried to create IR(test case) with optimization without this patch but i am not getting this line.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86395/new/

https://reviews.llvm.org/D86395