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Commit cfeb1cf9 authored by Craig Topper's avatar Craig Topper
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[X86] Add INSERT_SUBVECTOR to ComputeNumSignBits 

This adds support for calculating sign bits of insert_subvector. I based it on the computeKnownBits.

My motivating case is propagating sign bits information across basic blocks on AVX targets where concatenating using insert_subvector is common.

Differential Revision: https://reviews.llvm.org/D56283

llvm-svn: 350432
parent 6b3153ad
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