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Author SHA1 Message Date
Craig Topper 36bd247f64 [X86] Add a target-specific DAG combine to combine extract_subvector from all zero/one build_vectors. 
llvm-svn: 311841
 2017-08-27 05:39:57 +00:00
Craig Topper 853a8d9ffc [AVX512] Don't create SHRUNKBLEND SDNodes for 512-bit vectors 
There are no 512-bit blend instructions so we shouldn't create SHRUNKBLEND for them.

On a side note, it looks like there may be a missed opportunity for constant folding TESTM when LHS and RHS are equal.

This fixes PR34139.

Differential Revision: https://reviews.llvm.org/D36992

llvm-svn: 311572
 2017-08-23 16:41:02 +00:00