Craig Topper 3b1239d2a8 [TargetLowering][X86] Teach SimplifyDemandedBits to use ShrinkDemandedOp on ISD::SHL nodes. ...

If the upper bits of the SHL result aren't used, we might be able to use a narrower shift. For example, on X86 this can turn a 64-bit into 32-bit enabling a smaller encoding.

Differential Revision: https://reviews.llvm.org/D60358

llvm-svn: 358257

2019-04-12 06:49:28 +00:00

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