#include <metal_stdlib>

using namespace metal;
kernel void f() {
  float3x3 const a = float3x3(float3(1.0f, 2.0f, 3.0f), float3(4.0f, 5.0f, 6.0f), float3(7.0f, 8.0f, 9.0f));
  float3x3 const b = float3x3(float3(-1.0f, -2.0f, -3.0f), float3(-4.0f, -5.0f, -6.0f), float3(-7.0f, -8.0f, -9.0f));
  float3x3 const r = (a - b);
  return;
}