Commit Graph

4 Commits

Author SHA1 Message Date
Craig Topper ff272ad4f3 [SelectionDAG] Teach getNode to simplify a couple easy cases of EXTRACT_SUBVECTOR
Summary:
This teaches getNode to simplify extracting from Undef. This is similar to what is done for EXTRACT_VECTOR_ELT. It also adds support for extracting from CONCAT_VECTOR when we can reuse one of the inputs to the concat. These seem like simple non-target specific optimizations.

For X86 we currently handle undef in extractSubvector, but not all EXTRACT_SUBVECTOR creations go through there.

Ultimately, my motivation here is to simplify extractSubvector and remove custom lowering for EXTRACT_SUBVECTOR since we don't do anything but handle undef and BUILD_VECTOR optimizations, but those should be DAG combines.

Reviewers: RKSimon, delena

Reviewed By: RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29000

llvm-svn: 292876
2017-01-24 02:36:59 +00:00
Craig Topper 01e4667e02 [AVX-512] Add support for creating SIGN_EXTEND_VECTOR_INREG and ZERO_EXTEND_VECTOR_INREG for 512-bit vectors to support vpmovzxbq and vpmovsxbq.
Summary: The one tricky thing about this is that the sign/zero_extend_inreg uses v64i8 as an input type which isn't legal without BWI support. Though the vpmovsxbq and vpmovzxbq instructions themselves don't require BWI. To support this we need to add custom lowering for ZERO_EXTEND_VECTOR_INREG with v64i8 input. This can mostly reuse the existing sign extend code with a couple checks for sign extend vs zero extend added.

Reviewers: delena, RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D25594

llvm-svn: 285053
2016-10-25 04:00:29 +00:00
Craig Topper 9ece2f7529 [AVX-512] Add missing pattern sext or zext from bytes to quad words with a 128-bit load as input.
llvm-svn: 283720
2016-10-10 06:25:48 +00:00
Craig Topper 0f905027b3 [AVX-512] Add test cases for AVX512 sign/zero extend instructions derived from the sse41 and avx2 test cases. Code will be improved in future commits.
llvm-svn: 283719
2016-10-10 06:25:45 +00:00