[PATCH] D30123: [InstCombine] shrink truncated splat shuffle

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In https://reviews.llvm.org/D30123#693699, @efriedma wrote:

> LGTM, but you might want to look into the following...
>
>   define <8 x i16> @wide_splat1(<8 x i32> %x) {
>     %shuf = trunc <8 x i32> %x to <8 x i16>
>     %trunc = shufflevector <8 x i16> %shuf, <8 x i16> undef, <8 x i32> <i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2>
>     ret <8 x i16> %trunc
>   }


Thanks for pointing it out. Filed as:
https://bugs.llvm.org/show_bug.cgi?id=32160


https://reviews.llvm.org/D30123