VADDPD 2032(DX), X29, X0        // 62f1950058427f
	VADDPD 2032(DX), X1, X29        // 6261f508586a7f
	VADDPD 2032(DX), X29, X28       // 6261950058627f
	VADDPD 2032(DX)(AX*2), X29, X0  // 62f195005844427f
	VADDPD 2032(DX)(AX*2), X1, X29  // 6261f508586c427f
	VADDPD 2032(DX)(AX*2), X29, X28 // 626195005864427f
	VADDPD 4064(DX), Y0, Y29        // 6261fd28586a7f
	VADDPD 4064(DX), Y29, Y1        // 62f19520584a7f

  // y = acos(x)
  // dy/dx = - 1 / (1 - x * x)^1/2
  // dx = dy * (- 1 / (1 - x * x)^1/2)
  auto x2 = Square(scope, op.input(0));
  auto one = Cast(scope, Const(scope, 1.0), op.input(0).type());
  auto dydx = Neg(scope, Reciprocal(scope, Sqrt(scope, Sub(scope, one, x2))));
  auto dx = Mul(scope, grad_inputs[0], dydx);
  grad_outputs->push_back(dx);
  return scope.status();
}

	VPCOMPRESSB X13, K1, X28                           // 62127d0963ec
	VPCOMPRESSB X8, K1, X28                            // 62127d0963c4
	VPCOMPRESSB X7, K1, -7(CX)(DX*1)                   // 62f27d09637c11f9
	VPCOMPRESSB X13, K1, -7(CX)(DX*1)                  // 62727d09636c11f9
	VPCOMPRESSB X8, K1, -7(CX)(DX*1)                   // 62727d09634411f9
	VPCOMPRESSB X7, K1, -15(R14)(R15*4)                // 62927d09637cbef1

TEXT runtime·gogo(SB), NOSPLIT, $0-8
	MOVQ	buf+0(FP), BX		// gobuf
	MOVQ	gobuf_g(BX), DX
	MOVQ	0(DX), CX		// make sure g != nil
	JMP	gogo<>(SB)

TEXT gogo<>(SB), NOSPLIT, $0
	get_tls(CX)
	MOVQ	DX, g(CX)
	MOVQ	DX, R14		// set the g register
	MOVQ	gobuf_sp(BX), SP	// restore SP
	MOVQ	gobuf_ret(BX), AX
	MOVQ	gobuf_ctxt(BX), DX
	MOVQ	gobuf_bp(BX), BP
	MOVQ	$0, gobuf_sp(BX)	// clear to help garbage collector

// i.e., d(y_1 + y_2 + ...)/dx_1, d(y_1 + y_2 + ...)/dx_2...
//
// `dx` are used as initial gradients (which represent the symbolic partial
// derivatives of some loss function `L` w.r.t. `y`).
// `dx` must be nullptr or have size `ny`.
// If `dx` is nullptr, the implementation will use dx of `OnesLike` for all
// shapes in `y`.
// The partial derivatives are returned in `dy`. `dy` should be allocated to

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    if (n.attr.empty()) {
      n.attr = {{"T", DT_FLOAT}};
    }
  }
  *g = FunctionDefHelper::Define(
      // Arg defs
      {"x: float", "dy: float"},
      // Ret val defs
      {"dx: float"},
      // Attr defs
      {},
      // Nodes
      nodes);
  return absl::OkStatus();
}

// A gradient containing only supported operators

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	"co": {"~", 1, precUnary},
	"dV": {"/=", 2, precAssign},
	"dX": {"[...]=", 3, precAssign},
	"da": {"delete[] ", 1, precUnary},
	"dc": {"dynamic_cast", 2, precPostfix},
	"de": {"*", 1, precUnary},
	"di": {"=", 2, precAssign},
	"dl": {"delete ", 1, precUnary},
	"ds": {".*", 2, precPtrMem},
	"dt": {".", 2, precPostfix},
	"dv": {"/", 2, precAssign},
	"dx": {"]=", 2, precAssign},
	"eO": {"^=", 2, precAssign},

				"application/csta+xml",
				"application/cstadata+xml",
				"application/cu-seeme",
				"application/cybercash",
				"application/davmount+xml",
				"application/dca-rft",
				"application/dec-dx",
				"application/dialog-info+xml",
				"application/dicom",
				"application/dita+xml",
				"application/dita+xml;format=map",
				"application/dita+xml;format=topic",
				"application/dita+xml;format=task",