llvm-project/llvm/test/CodeGen/ARM64/build-vector.ll

; RUN: llc < %s -march=arm64 -arm64-neon-syntax=apple | FileCheck %s

; Check that building up a vector w/ only one non-zero lane initializes
; intelligently.
define void @one_lane(i32* nocapture %out_int, i32 %skip0) nounwind {
; CHECK-LABEL: one_lane:
; CHECK: dup.16b v[[REG:[0-9]+]], wzr
; CHECK-NEXT: ins.b v[[REG]][0], w1
; v and q are aliases, and str is preferred against st.16b when possible
; rdar://11246289
; CHECK: str q[[REG]], [x0]
; CHECK: ret
  %conv = trunc i32 %skip0 to i8
  %vset_lane = insertelement <16 x i8> <i8 undef, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>, i8 %conv, i32 0
  %tmp = bitcast i32* %out_int to <4 x i32>*
  %tmp1 = bitcast <16 x i8> %vset_lane to <4 x i32>
  store <4 x i32> %tmp1, <4 x i32>* %tmp, align 16
  ret void
}

; Check that building a vector from floats doesn't insert an unnecessary
; copy for lane zero.
define <4 x float>  @foo(float %a, float %b, float %c, float %d) nounwind {
; CHECK-LABEL: foo:
; CHECK-NOT: ins.s v0[0], v0[0]
; CHECK: ins.s v0[1], v1[0]
; CHECK: ins.s v0[2], v2[0]
; CHECK: ins.s v0[3], v3[0]
; CHECK: ret
  %1 = insertelement <4 x float> undef, float %a, i32 0
  %2 = insertelement <4 x float> %1, float %b, i32 1
  %3 = insertelement <4 x float> %2, float %c, i32 2
  %4 = insertelement <4 x float> %3, float %d, i32 3
  ret <4 x float> %4
}