Currently clang provides no general way to generate nontemporal loads/stores.
There are some architecture specific builtins for doing so (e.g. in x86), but
there is no way to generate non-temporal store on, e.g. AArch64. This patch adds
generic builtins which are expanded to a simple store with '!nontemporal'
attribute in IR.
Previously I tried to tackle the same issue by introducing
attribute((nontemporal)) (see D12221), but was convinced that builtins might
fit for such use better.
Does the patch look good?
Thanks,
Michael