Bhramar Vatsa fd679107d6 [InstCombine] Optimize away the unnecessary multi-use sign-extend ...

C.f. https://bugs.llvm.org/show_bug.cgi?id=47765

Added a case for handling the sign-extend (Shl+AShr) for multiple uses,
to optimize it away for an individual use,
when the demanded bits aren't affected by sign-extend.

https://rise4fun.com/Alive/lgf

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D91343

2020-12-01 16:54:00 +03:00

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