llvm-project/llvm/test/CodeGen/AArch64/concat_vector-truncate-combine.ll

; RUN: llc < %s -mtriple arm64-apple-darwin -asm-verbose=false | FileCheck %s

target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"

; Test the (concat_vectors (trunc), (trunc)) pattern.

define <4 x i16> @test_concat_truncate_v2i64_to_v4i16(<2 x i64> %a, <2 x i64> %b) #0 {
entry:
; CHECK-LABEL: test_concat_truncate_v2i64_to_v4i16:
; CHECK-NEXT: uzp1.4s v0, v0, v1
; CHECK-NEXT: xtn.4h v0, v0
; CHECK-NEXT: ret
  %at = trunc <2 x i64> %a to <2 x i16>
  %bt = trunc <2 x i64> %b to <2 x i16>
  %shuffle = shufflevector <2 x i16> %at, <2 x i16> %bt, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
  ret <4 x i16> %shuffle
}

define <8 x i8> @test_concat_truncate_v4i32_to_v8i8(<4 x i32> %a, <4 x i32> %b) #0 {
entry:
; CHECK-LABEL: test_concat_truncate_v4i32_to_v8i8:
; CHECK-NEXT: uzp1.8h v0, v0, v1
; CHECK-NEXT: xtn.8b v0, v0
; CHECK-NEXT: ret
  %at = trunc <4 x i32> %a to <4 x i8>
  %bt = trunc <4 x i32> %b to <4 x i8>
  %shuffle = shufflevector <4 x i8> %at, <4 x i8> %bt, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
  ret <8 x i8> %shuffle
}

define <8 x i16> @test_concat_truncate_v4i32_to_v8i16(<4 x i32> %a, <4 x i32> %b) #0 {
entry:
; CHECK-LABEL: test_concat_truncate_v4i32_to_v8i16:
; CHECK-NEXT: xtn.4h v0, v0
; CHECK-NEXT: xtn2.8h v0, v1
; CHECK-NEXT: ret
  %at = trunc <4 x i32> %a to <4 x i16>
  %bt = trunc <4 x i32> %b to <4 x i16>
  %shuffle = shufflevector <4 x i16> %at, <4 x i16> %bt, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
  ret <8 x i16> %shuffle
}

attributes #0 = { nounwind }