#version 310 es
precision mediump float;

void f() {
  mat3 a = mat3(vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f), vec3(7.0f, 8.0f, 9.0f));
  mat3 b = mat3(vec3(-1.0f, -2.0f, -3.0f), vec3(-4.0f, -5.0f, -6.0f), vec3(-7.0f, -8.0f, -9.0f));
  mat3 r = (a - b);
}

layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main() {
  f();
  return;
}