tree 3f019ad24c17d64bb7b058b5db31023b30561264
parent e5efa6a22a313b382476afc8731df5494b0ed80f
author Tim Northover <tnorthover@apple.com> 1546954227 +0000
committer Tim Northover <tnorthover@apple.com> 1546954227 +0000

AArch64: avoid splitting vector truncating stores.

We have code to split vector splats (of zero and non-zero) for performance
reasons, but it ignores the fact that a store might be truncating.

Actually, truncating stores are formed for vNi8 and vNi16 types. Since the
truncation is from a legal type, the size of the store is always <= 64-bits and
so they don't actually benefit from being split up anyway, so this patch just
disables that transformation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350620 91177308-0d34-0410-b5e6-96231b3b80d8