} else if (align == "LEFT_LEFT") {
      superdiagonal_align = kLeft;
      subdiagonal_align = kLeft;
    } else {
      return failure();  // unsupported alignment
    }

    // MatrixDiagPart operates on a matrix of shape [I, J, ..., L, M, N], and
    // will extract the diagonal(s) out of [M, N], for all [I, J, ..., L].
    if (!input_type || !input_type.hasStaticShape()) return failure();

	add := func(pkg, fn string, b intrinsicBuilder, archs ...*sys.Arch) {
		for _, a := range archs {
			intrinsics[intrinsicKey{a, pkg, fn}] = b
		}
	}
	// addF does the same as add but operates on architecture families.
	addF := func(pkg, fn string, b intrinsicBuilder, archFamilies ...sys.ArchFamily) {
		m := 0
		for _, f := range archFamilies {
			if f >= 32 {
				panic("too many architecture families")