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Commit 794e29f9 authored by Roman Lebedev's avatar Roman Lebedev
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[NFC][InstCombine] Tests for (x << y) >> y -> x & (-1 >> y) fold. 

We already do it for splat constants, but not just values.
Also, undef cases are mostly non-functional.

https://bugs.llvm.org/show_bug.cgi?id=37603
https://rise4fun.com/Alive/cplX

llvm-svn: 334346
parent 5aa26980
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