tree 13955d0734e451ac7a9c61965426029b89a3bb90
parent 06a887ac8a688a23aa09252f44e9bb95797d057f
author Craig Topper <craig.topper@intel.com> 1547254527 +0000
committer Craig Topper <craig.topper@intel.com> 1547254527 +0000

[X86] Add ISD nodes for masked truncate so we can properly represent when the output has more elements than the input due to needing to be 128 bits.

We can't properly represent this with a vselect since the upper elements of the result are supposed to be zeroed regardless of the mask.

This also reuses the new nodes even when the result type fits in 128 bits if the input is q/d and the result is w/b since vselect w/b using k-register condition isn't legal without avx512bw. Currently we're doing this even when avx512bw is enabled, but I might change that.

This fixes some of PR34877

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350985 91177308-0d34-0410-b5e6-96231b3b80d8