SKIP: FAILED

RWByteAddressBuffer prevent_dce : register(u0);

int2 subgroupShuffleUp_db5bcb() {
  int2 res = WaveReadLaneAt((1).xx, (WaveGetLaneIndex() - 1u));
  return res;
}

void fragment_main() {
  prevent_dce.Store2(0u, asuint(subgroupShuffleUp_db5bcb()));
  return;
}

[numthreads(1, 1, 1)]
void compute_main() {
  prevent_dce.Store2(0u, asuint(subgroupShuffleUp_db5bcb()));
  return;
}
FXC validation failure:
C:\src\dawn\Shader@0x0000020C8CF1BBB0(4,38-55): error X3004: undeclared identifier 'WaveGetLaneIndex'