// swizzling.
func floatBits(f float64) uint64 {
	u := math.Float64bits(f)
	return bits.ReverseBytes64(u)
}

// encFloat encodes the floating point value (float32 float64) referenced by v.
func encFloat(i *encInstr, state *encoderState, v reflect.Value) {
	f := v.Float()
	if f != 0 || state.sendZero {
		bits := floatBits(f)
		state.update(i)
		state.encodeUint(bits)
	}

	/* 0xE0-0xFF reserved for user-specific */
)

// Basic type encodings -- the value for AttrEncoding in a TagBaseType Entry.
const (
	encAddress      = 0x01
	encBoolean      = 0x02
	encComplexFloat = 0x03
	encFloat        = 0x04
	encSigned       = 0x05
	encSignedChar   = 0x06
	encUnsigned     = 0x07
	encUnsignedChar = 0x08
	// The following are new in DWARF 3.
	encImaginaryFloat = 0x09
	encPackedDecimal  = 0x0A

		}

	case TagBaseType:
		// Basic type.  (DWARF v2 §5.1)
		// Attributes:
		//	AttrName: name of base type in programming language of the compilation unit [required]
		//	AttrEncoding: encoding value for type (encFloat etc) [required]
		//	AttrByteSize: size of type in bytes [required]
		//	AttrBitOffset: bit offset of value within containing storage unit
		//	AttrDataBitOffset: bit offset of value within containing storage unit

		var data float32 = 17
		instr := &encInstr{encFloat, 6, nil, 0}
		state := newEncoderState(b)
		instr.op(instr, state, reflect.ValueOf(data))
		if !bytes.Equal(floatResult, b.Bytes()) {
			t.Errorf("float32 enc instructions: expected % x got % x", floatResult, b.Bytes())
		}
	}

	// float64
	{
		b.Reset()
		var data float64 = 17
		instr := &encInstr{encFloat, 6, nil, 0}
		state := newEncoderState(b)