[PATCH] D52596: [InstCombine] Add combines of icmp (mul nsw/nuw X, C2), C when C % C2 == 0

[Nicola Zaghen via Phabricator via llvm-commits]

Nicola created this revision.
Nicola added a reviewer: spatel.
Herald added a subscriber: llvm-commits.

I think this is the least tricky part of the combines. The proof for this (and all the others) is here:

- eq/neq: https://rise4fun.com/Alive/9PBA
- sgt/ugt: https://rise4fun.com/Alive/58yr
- slt/ult: https://rise4fun.com/Alive/VCQ

The ones implemented here are the ones with the C2 % C1 == 0


Repository:
  rL LLVM

https://reviews.llvm.org/D52596

Files:
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/icmp-mul.ll

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