@group(0) @binding(0) var<uniform> u : mat3x4<f32>;

@group(0) @binding(1) var<storage, read_write> s : mat3x4<f32>;

@compute @workgroup_size(1)
fn f() {
  s = u;
  s[1] = u[0];
  s[1] = u[0].ywxz;
  s[0][1] = u[1][0];
}