[ARM] Split 128-bit vectors in BUILD_VECTOR lowering
Given that INSERT_VECTOR_ELT operates on D registers anyway, combining
64-bit vectors into a 128-bit vector is basically free. Therefore, try
to split BUILD_VECTOR nodes before giving up and lowering them to a series
of INSERT_VECTOR_ELT instructions. Sometimes this allows dramatically
better lowerings; see testcases for examples. Inspired by similar code
in the x86 backend for AVX.
Differential Revision: https://reviews.llvm.org/D27624
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289706 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed