AArch64: Change modeling of zero cycle zeroing.
On CPUs with the zero cycle zeroing feature enabled "movi v.2d" should
be used to zero a vector register. This was previously done at
instruction selection time, however the register coalescer sometimes
widened multiple vregs to the Q width because of that leading to extra
spills. This patch leaves the decision on how to zero a register to the
AsmPrinter phase where it doesn't affect register allocation anymore.
This patch also sets isAsCheapAsAMove=1 on FMOVS0, FMOVD0.
This fixes http://llvm.org/PR27454, rdar://25866262
Differential Revision: http://reviews.llvm.org/D21826
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274686 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed