Class: Flt::HexadecimalFormat
Overview
Hexadecimal floating point format
Constant Summary
Constants included
from Flt
APPLE, IEEE_128, IEEE_128_BE, IEEE_DEC128, IEEE_DEC32, IEEE_DEC64, IEEE_DOUBLE, IEEE_D_BE, IEEE_EXTENDED, IEEE_HALF, IEEE_H_BE, IEEE_QUAD, IEEE_Q_BE, IEEE_SINGLE, IEEE_S_BE, IEEE_X_BE, IEEE_binaryx, RPL, RPL_X
Instance Attribute Summary
Attributes inherited from FormatBase
#exponent, #sign, #significand
Class Method Summary
collapse
pack_fields, unpack_fields
Methods inherited from FormatBase
#<=>, arithmetic, arithmetic_type, bias, canonicalized, context, #convert_to, decimal_digits_necessary, decimal_digits_stored, decimal_max_exp, decimal_min_exp, endianness, epsilon, #form_class, #fp_format, from, from_bits, from_bits_text, from_bytes, from_hex, from_number, from_text, gradual_underflow?, half_epsilon, #infinite?, infinity, #initialize, join, max_value, maximum_integral_significand, min_normalized_value, min_value, minimum_normalized_integral_significand, #minus, nan, #nan?, #next_minus, #next_plus, nio_read_neutral, #nio_write_neutral, #normal?, num, num_class, pack_fields_hash, radix_log, radix_log10, radix_max_exp, radix_min_exp, radix_power, rounding_mode, sign_from_unit, sign_to_unit, #split, strict_epsilon, #subnormal?, switch_sign_value, #to, #to_a, #to_bits, #to_bits_text, #to_bytes, #to_hex, #to_num, #to_text, #ulp, unpack_fields_hash, zero, #zero?
Methods included from Flt
#*, #+, #-, #-@, #/, bcd2dpd, bitnot, convert_bytes, dbl_from_float, dbl_from_text, dbl_to_float, dpd2bcd, dpd_to_hexbcd, float_bin, float_dec, float_from_integral_sign_significand_exponent, float_from_integral_significand_exponent, float_shortest_dec, float_significant_dec, float_to_integral_sign_significand_exponent, float_to_integral_significand_exponent, hex_from_float, hex_to_float, hexbcd_to_dpd, sgl_from_float, sgl_from_text, sgl_to_float
Class Method Details
.define(params) ⇒ Object
1564
1565
1566
1567
1568
1569
1570
1571
|
# File 'lib/float-formats/classes.rb', line 1564
def self.define(params)
@hidden_bit = false
@splitted_fields_supported = true
define_fields params[:fields]
@significand_digits = @fields[:significand]/4
params[:exponent_radix] = 2
super params
end
|
.exponent_digits ⇒ Object
1657
1658
1659
|
# File 'lib/float-formats/classes.rb', line 1657
def self.exponent_digits
@fields[exponent]/4
end
|
.fields_radix ⇒ Object
1578
1579
1580
|
# File 'lib/float-formats/classes.rb', line 1578
def self.fields_radix
exponent_radix
end
|
.minus_sign_value ⇒ Object
1653
1654
1655
|
# File 'lib/float-formats/classes.rb', line 1653
def self.minus_sign_value
(-1) % 2
end
|
.pack(s, m, e) ⇒ Object
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
|
# File 'lib/float-formats/classes.rb', line 1613
def self.pack(s,m,e)
msb = radix_power(@significand_digits-1)
if e==:zero
e = @zero_encoded_exp
m = 0
elsif e==:infinity
e = @infinite_encoded_exp || radix_power(@fields[:exponent])-1
m = 0
elsif e==:nan
e = @nan_encoded_exp || radix_power(@fields[:exponent])-1
s = minus_sign_value m = radix_power(@significand_digits-2) if m==0
elsif e==:denormal
e = @denormal_encoded_exp || @zero_encoded_exp
else
min_exp = radix_min_exp(:integral_significand)
if m>0
while m<msb && e>min_exp
e -= 1
m <<= 4 end
end
if m<msb && @denormal_encoded_exp
e = @denormal_encoded_exp
elsif m==0 e = 0
else
e = encode_exponent(e, :integral_significand)
end
end
s = sign_from_unit(s)
m,e = neg_significand_exponent(0,m,e) if s%2==1
pack_fields_hash :sign=>s, :significand=>m, :exponent=>e
end
|
.radix ⇒ Object
1575
1576
1577
|
# File 'lib/float-formats/classes.rb', line 1575
def self.radix
16
end
|
.total_bits ⇒ Object
1582
1583
1584
|
# File 'lib/float-formats/classes.rb', line 1582
def self.total_bits
@field_lengths.inject{|x,y| x+y}
end
|
.total_bytes ⇒ Object
1585
1586
1587
|
# File 'lib/float-formats/classes.rb', line 1585
def self.total_bytes
(total_bits+7)/8
end
|
.unpack(v) ⇒ Object
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
|
# File 'lib/float-formats/classes.rb', line 1590
def self.unpack(v)
f = unpack_fields_hash(v)
m = f[:significand]
e = f[:exponent]
s = f[:sign]
m,e = neg_significand_exponent(s,m,e) if s%2==1
if m==0
e = :zero
elsif @infinite_encoded_exp && e==@infinite_encoded_exp && m==0
e = :infinity
elsif @nan_encoded_exp && e==@nan_encoded_exp && m!=0
e = :nan
else
e = decode_exponent(e, :integral_significand)
end
s = sign_to_unit(s)
[s,m,e]
end
|