add testing version of divide-float.py - a wrapper which adds support for floating-point division based on existing division methods

This commit is contained in:
dymik739 2023-05-24 18:05:23 +03:00
parent 3598eb13f1
commit 6018537352
3 changed files with 157 additions and 19 deletions

View File

@ -74,4 +74,6 @@ def xor(x, y):
else: else:
result += '0' result += '0'
return result return result
else:
pass

129
src/divide-float.py Normal file
View File

@ -0,0 +1,129 @@
# a wrapper for division script which adds support for floating point numbers
from lib.prettytable import PrettyTable
from divide import divide, table_to_text
import bitutils as bu
def get_reference_register_size(*numbers):
return max(map(len, numbers))
def parse_float(number):
split_by_dot = number.split('.')
Sn = split_by_dot[0] # sign
split_by_comma = split_by_dot[1].split(',')
Pn = len(split_by_comma[0].lstrip('0'))
Mn = ''.join(split_by_comma).lstrip('0')
return Sn, Pn, Mn
def to_int(number):
return int("0b" + number, 2)
def normalize_mantice(m, n):
M_norm = m.lstrip('0')
P_delta = len(m) - len(M_norm)
print(f"Normalize: {m} -> {M_norm} (shifted right {P_delta} times)")
return M_norm[:n], P_delta
def round_mantice(m, n):
closest_upper = bu.sum(m[:n+1], '1', n+1)
return closest_upper[:n]
def print_classic_float(label, Sn, Pn, Mn):
pt = PrettyTable()
pt.field_names = [f"S{label}", f"P{label}", f"M{label}"]
pt.add_row([Sn, bin(Pn).lstrip('-')[2:], Mn])
print(pt)
def print_shortened_float(label, Sn, Pn, Mn):
mutable_mantice = list(Mn)
P = Pn
while P < 0:
mutable_mantice.insert(0, '0')
P += 1
if P > len(mutable_mantice):
for i in range(len(mutable_mantice), P+1):
mutable_mantice.insert(i, '0')
mutable_mantice.insert(P, ',')
result_string = ''.join(mutable_mantice)
print(f"{Sn}.{result_string}".replace(".,", ".0,"))
def divide_float(x, y, method, n = 0, verbose = False):
Sx, Px, Mx = parse_float(x)
Sy, Py, My = parse_float(y)
print(f"Число X:\n" \
f"Знак мантиси: {Sx}\n" \
f"Порядок: {Px}\n" \
f"Мантиса: {Mx}\n")
print(f"Число Y:\n" \
f"Знак мантиси: {Sy}\n" \
f"Порядок: {Py}\n" \
f"Мантиса: {My}")
'''
while to_int(Mx) >= to_int(My):
print(f"Mx >= My ({Mx} >= {My}), тому зсуваємо Mx на один розряд праворуч і збільшуємо порядок числа X")
Mx = '0' + Mx
Px += 1
'''
Mx = Mx.rstrip("0")
My = My.rstrip("0")
print("Запис чисел у класичному форматі:")
print_classic_float('x', Sx, Px, Mx)
print()
print_classic_float('y', Sy, Py, My)
print()
#reg_size = get_reference_register_size(Mx, My)
while to_int(Mx) >= to_int(My):
print(f"Mx >= My ({Mx} >= {My}), тому зсуваємо Mx на один розряд праворуч і збільшуємо порядок числа X")
Mx = '0' + Mx
My = My + '0'
Px += 1
if n == 0:
reg_size = get_reference_register_size(Mx, My)
print(f"n = 0, отже довжина регістрів обирається автоматично ({reg_size})")
else:
reg_size = n
table, result = divide(reg_size, to_int(bu.al(Mx, reg_size)), to_int(bu.al(My, reg_size)), method)
print(f"Процес ділення методом #{method}:\n{table_to_text(table)}\n")
print("Маємо результат:")
S_result = bu.xor(Sx, Sy)
print(f"Знаковий розряд: {Sx}{Sy} = {S_result}")
M_norm, P_delta = normalize_mantice(result, n+1)
print(f"Нормалізована мантиса: ,{M_norm}")
P_result = Px - Py - P_delta
print(f"Порядок: {Px} + {Py} - {P_delta} = {P_result}")
M_result = round_mantice(bu.al(result, n+1), n+1)
print(f"Округлюємо мантису до {reg_size} розрядів: ,{M_result}")
return S_result, P_result, M_result
if __name__ == "__main__":
start_x = input("X: ")
start_y = input("Y: ")
n = int(input("n: "))
method = int(input("Method: "))
S_result, P_result, M_result = divide_float(start_x, start_y, method, n)
print(f"Запишемо результат у вигляді таблиці:")
print_classic_float('f', S_result, P_result, M_result)
print("І отримуємо остаточне число після ділення:")
print_shortened_float('F', S_result, P_result, M_result)

View File

@ -3,16 +3,16 @@ import bitutils as bu
def divide(n, int_x, int_y, method): def divide(n, int_x, int_y, method):
if method == 1: if method == 1:
# getting binary values # getting binary values
x = bu.ar(bin(int_x)[2:], n) x = bu.ar(bin(int_x)[2:], n+2)
y = bu.ar(bin(int_y)[2:], n) y = bu.ar(bin(int_y)[2:], n+2)
# getting the supplementary code of X # getting the supplementary code of X
y_inv = "".join([bu.inv(i) for i in y]) # invert y_inv = "".join([bu.inv(i) for i in y]) # invert
y_inv = bu.sum(y_inv, '1', n) # +1 y_inv = bu.sum(y_inv, '1', n+2) # +1
# writing startup register values # writing startup register values
# registers order: RG3, RG2, RG1 # registers order: RG3, RG2, RG1
rg_table = [[['start', '1'*(n-1), x, y, '-'], ['start', '1'*(n-1), x, y_inv, '-']]] rg_table = [[['start', '1'*(n+1), x, y, '-'], ['start', '1'*(n+1), x, y_inv, '-']]]
# iterations counter # iterations counter
i = 0 i = 0
@ -25,7 +25,7 @@ def divide(n, int_x, int_y, method):
rg_table[-1].append([ rg_table[-1].append([
i, i,
rg_table[-2][-1][1], # copy previous value rg_table[-2][-1][1], # copy previous value
bu.sum(rg_table[-2][-1][2], rg_table[0][0][3], n), # RG2 := RG2 + RG1 bu.sum(rg_table[-2][-1][2], rg_table[0][0][3], n+2), # RG2 := RG2 + RG1
'-', '-',
"RG2 := RG2 + RG1" "RG2 := RG2 + RG1"
]) ])
@ -33,7 +33,7 @@ def divide(n, int_x, int_y, method):
rg_table[-1].append([ rg_table[-1].append([
i, i,
rg_table[-2][-1][1], # copy previous value rg_table[-2][-1][1], # copy previous value
bu.sum(rg_table[-2][-1][2], rg_table[0][1][3], n), # RG2 := RG2 - RG1 bu.sum(rg_table[-2][-1][2], rg_table[0][1][3], n+2), # RG2 := RG2 - RG1
'-', '-',
"RG2 := RG2 - RG1" "RG2 := RG2 - RG1"
]) ])
@ -104,11 +104,29 @@ def divide(n, int_x, int_y, method):
return rg_table, rg_table[-1][-1][1][1:] return rg_table, rg_table[-1][-1][1][1:]
def table_to_text(dt):
from lib.prettytable import PrettyTable
pt = PrettyTable()
pt.field_names = ["Iteration", "RG3", "RG2", "RG1", "Operations"]
for i in dt:
for j in range(len(i)):
if j+1 == len(i):
pt.add_row(i[j], divider = True)
else:
pt.add_row(i[j])
return pt.get_string()
if __name__ == "__main__": if __name__ == "__main__":
# a fully functional reference # a fully functional reference
# implementation for this library # implementation for this library
# is provided below # is provided below
# usage change of method #1
print("УВАГА! Для першого методу додавати два нулі перед числом БІЛЬШЕ НЕ ПОТРІБНО!\n"
"(це попередження буде прибрано у майбутніх версіях, вводьте числа уважно)")
raw_x = input("X: ") raw_x = input("X: ")
raw_y = input("Y: ") raw_y = input("Y: ")
@ -124,16 +142,5 @@ if __name__ == "__main__":
dt, result = divide(n, x, y, method) dt, result = divide(n, x, y, method)
from lib.prettytable import PrettyTable print(table_to_text(dt))
pt = PrettyTable()
pt.field_names = ["Iteration", "RG3", "RG2", "RG1", "Operations"]
for i in dt:
for j in range(len(i)):
if j+1 == len(i):
pt.add_row(i[j], divider = True)
else:
pt.add_row(i[j])
print(pt)
print(f"Result: {result}") print(f"Result: {result}")