[llvm] [AArch64] Improve lowering of truncating uzp1 (PR #82457)

[Usman Nadeem via llvm-commits]

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@@ -6125,6 +6125,15 @@ def : Pat<(v8i16 (concat_vectors (v4i16 (assertzext (trunc (v4i32 V128:$Vn)))),
 def : Pat<(v4i32 (concat_vectors (v2i32 (assertzext (trunc (v2i64 V128:$Vn)))),
                                  (v2i32 (assertzext (trunc (v2i64 V128:$Vm)))))),
           (UZP1v4i32 V128:$Vn, V128:$Vm)>;
+def : Pat<(v16i8 (concat_vectors (v8i8 (assertsext (trunc (v8i16 V128:$Vn)))),
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UsmanNadeem wrote:

I uploaded a new commit to this PR, the current version will no longer get rid of those nodes.

https://github.com/llvm/llvm-project/pull/82457