It should increase PV substitution opportunities and lower gpr
usage (pending computations path are "flushed" sooner)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182128 91177308-0d34-0410-b5e6-96231b3b80d8
Dot4 now uses 8 scalar operands instead of 2 vectors one which allows register
coalescer to remove some unneeded COPY.
This patch also defines some structures/functions that can be used to handle
every vector instructions (CUBE, Cayman special instructions...) in a similar
fashion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182126 91177308-0d34-0410-b5e6-96231b3b80d8