REGISTER_NO_GRADIENT_OP("ApproximateEqual");
REGISTER_NO_GRADIENT_OP("NotEqual");
REGISTER_NO_GRADIENT_OP("LogicalAnd");
REGISTER_NO_GRADIENT_OP("LogicalOr");
REGISTER_NO_GRADIENT_OP("LogicalNot");
REGISTER_NO_GRADIENT_OP("Floor");

// Conjugate helper function returns the conjugate of an Output if it
// is complex valued.
Output ConjugateHelper(const Scope& scope, const Output& out) {
  DataType dtype = out.type();

		}
		if c.vers == VersionTLS13 {
			return c.in.setErrorLocked(&net.OpError{Op: "remote error", Err: alert(data[1])})
		}
		switch data[0] {
		case alertLevelWarning:
			// Drop the record on the floor and retry.
			return c.retryReadRecord(expectChangeCipherSpec)
		case alertLevelError:
			return c.in.setErrorLocked(&net.OpError{Op: "remote error", Err: alert(data[1])})
		default:

						continue
					}
					key, _ := kv.Key.(*ast.Ident)
					// do all possible checks early (before exiting due to errors)
					// so we don't drop information on the floor
					check.expr(nil, x, kv.Value)
					if key == nil {
						check.errorf(kv, InvalidLitField, "invalid field name %s in struct literal", kv.Key)
						continue
					}

    //
    // We don't have a frac(x) primitive in XLA and computing it is tricky, but
    // because abs(sin(pi * x)) = abs(sin(pi * abs(x))), it's good enough for
    // our purposes to use abs(frac(x)) = abs(x) - floor(abs(x)).
    //
    // Furthermore, pi * abs(frac(x)) loses precision when abs(frac(x)) is close
    // to 1.  To remedy this, we can use the fact that sin(pi * x) in the domain

						continue
					}
					key, _ := kv.Key.(*syntax.Name)
					// do all possible checks early (before exiting due to errors)
					// so we don't drop information on the floor
					check.expr(nil, x, kv.Value)
					if key == nil {
						check.errorf(kv, InvalidLitField, "invalid field name %s in struct literal", kv.Key)
						continue
					}

          // Unary
          {"PW",
           {"ComplexAbs", "Angle", "Conj", "Abs", "Acos", "Acosh", "Asin",
            "Atan", "Atanh", "Ceil", "Cos", "Cosh", "Sin", "Exp", "Expm1",
            "Floor", "IsFinite", "IsInf", "IsNan", "Inv", "Reciprocal", "Log",
            "Log1p", "Invert", "LogicalNot", "Ndtri", "Neg", "Rint", "Round",
            "Rsqrt", "Sigmoid", "Sign", "Sinh", "Softplus", "Softsign", "Sqrt",

  => (NEG (Select0 <typ.UInt64> (SUBE (MOVDconst [0]) (MOVDconst [0]) (Select1 <types.TypeFlags> (SUBE x y (Select1 <types.TypeFlags> (SUBC (MOVDconst [0]) c)))))))

// math package intrinsics
(Sqrt      ...) => (FSQRT ...)
(Floor       x) => (FIDBR [7] x)
(Ceil        x) => (FIDBR [6] x)
(Trunc       x) => (FIDBR [5] x)
(RoundToEven x) => (FIDBR [4] x)
(Round       x) => (FIDBR [1] x)
(FMA     x y z) => (FMADD z x y)

(PopCount16 x) => (POPCNTL (MOVWQZX <typ.UInt32> x))
(PopCount8 x) => (POPCNTL (MOVBQZX <typ.UInt32> x))

(Sqrt ...) => (SQRTSD ...)
(Sqrt32 ...) => (SQRTSS ...)

(RoundToEven x) => (ROUNDSD [0] x)
(Floor x)       => (ROUNDSD [1] x)
(Ceil x)        => (ROUNDSD [2] x)
(Trunc x)       => (ROUNDSD [3] x)

(FMA x y z) => (VFMADD231SD z x y)

// Lowering extension