> Don't these have reasonably simple LLVM IR representations? For example:
>
> define <2 x i32> @addhn(<2 x i64> %lhs, <2 x i64> %rhs) {
> %sum = add <2 x i64> %lhs, %rhs
> %shift = shl <2 x i64> %sum, <i64 32, i64 32>
> %trunc = trunc <2 x i64> %shift to <2 x i32>
> ret <2 x i32> %trunc
> }
>
>
Do you mean to use lshr instead of shl, because addhn is to get high
narrow, so we could have,
define <2 x i32> @addhn(<2 x i64> %lhs, <2 x i64> %rhs) {
%sum = add <2 x i64> %lhs, %rhs
%shift = lshr <2 x i64> %sum, <i64 32, i64 32>
%trunc = trunc <2 x i64> %shift to <2 x i32>
ret <2 x i32> %trunc
}
Thanks,
-Jiangning
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