[PATCH] D31679: Use PMADDWD to expand reduction in a loop

[Dehao Chen via Phabricator via llvm-commits]

danielcdh marked an inline comment as done.
danielcdh added a comment.

In https://reviews.llvm.org/D31679#719786, @zvi wrote:

> Thanks for working on this patch. Regarding support for PMADDUBSW, can we match something like the following?
>
>   for (int i = 0; i < count; i++) {
>     a = saturate(a + x[i] * y[i]);
>   }


How does user specify "saturate"? Is it a general builtin in clang?


https://reviews.llvm.org/D31679