[PATCH] D96873: [RISCV] Begin to support more subvector inserts/extracts

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
frasercrmck added reviewers: craig.topper, evandro, rogfer01, HsiangKai, khchen, arcbbb.
Herald added subscribers: vkmr, luismarques, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar, asb, hiraditya.
frasercrmck requested review of this revision.
Herald added subscribers: llvm-commits, MaskRay.
Herald added a project: LLVM.

This patch adds support for INSERT_SUBVECTOR and EXTRACT_SUBVECTOR
(nominally where both operands are scalable vector types) where the
vector, subvector, and index align sufficiently to allow decomposition
to subregister manipulation:

- For extracts, the extracted subvector must correctly align with the

lower elements of a vector register.

- For inserts, the inserted subvector must be at least one full vector

register, and correctly align as above.

This approach should work for fixed-length vector insertion/extraction
too, but that will come later.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96873

Files:
  llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
  llvm/test/CodeGen/RISCV/rvv/extract-subvector.ll
  llvm/test/CodeGen/RISCV/rvv/insert-subvector.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D96873.324317.patch
Type: text/x-patch
Size: 29051 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20210217/22528143/attachment.bin>