[PATCH] D137157: InstCombine] fold mul with decremented "shl -1" factor (2nd try)

[Mike Hommey via Phabricator via llvm-commits]

glandium added a comment.

FWIW, I tested replacing CreateAdd with CreateSub on the original commit yesterday, and it fixed the issues I had.


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  https://reviews.llvm.org/D137157/new/

https://reviews.llvm.org/D137157