message: Fix for shfl_down_sync that was missed at gpu_math.h:74
diff: @@ -71,7 +71,7 @@ float3 shuffle_down(const float3 &a, int delta) {
  #else
  return float3(__shfl_down(a.x, delta),
  __shfl_down(a.y, delta),
  - __shfl_down_sync(a.z, delta));
  + __shfl_down(a.z, delta));
  #endif
  }
  