[llvm-branch-commits] [llvm] [LoongArch] Custom legalize vector_shuffle to `[x]vpermi.w` (PR #164945)

[via llvm-branch-commits]

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@@ -50,7 +51,8 @@ define <8 x i16> @widen_shuffle_mask_v8i16_to_v4i32(<8 x i16> %a, <8 x i16> %b)
 define <8 x i16> @widen_shuffle_mask_v8i16_to_v2i64(<8 x i16> %a, <8 x i16> %b) {
 ; CHECK-LABEL: widen_shuffle_mask_v8i16_to_v2i64:
 ; CHECK:       # %bb.0:
-; CHECK-NEXT:    vshuf4i.d $vr0, $vr1, 12
+; CHECK-NEXT:    vpermi.w $vr1, $vr0, 228
+; CHECK-NEXT:    vori.b $vr0, $vr1, 0
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zhaoqi5 wrote:

Maybe the answer is no. The `vori.b` is just used to move the result form `vr1` into `vr0` as the return vector.

https://github.com/llvm/llvm-project/pull/164945