File: concat_vector-truncated-scalar-combine.ll

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llvm-toolchain-21 1%3A21.1.6-3
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; RUN: llc < %s -mtriple aarch64-unknown-unknown -asm-verbose=false | FileCheck %s

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

; Test the (concat_vectors (bitcast (trunc (scalar))), undef..) pattern.

define <8 x i8> @test_concat_from_truncated_scalar(i32 %x) #0 {
entry:
; CHECK-LABEL: test_concat_from_truncated_scalar:
; CHECK-NEXT: fmov s0, w0
; CHECK-NEXT: ret
  %t = trunc i32 %x to i16
  %0 = bitcast i16 %t to <2 x i8>
  %1 = shufflevector <2 x i8> %0, <2 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2>
  ret <8 x i8> %1
}

attributes #0 = { nounwind }