93 lines
2.6 KiB
Python
93 lines
2.6 KiB
Python
# check cases converting float to int, requiring double precision float
|
|
|
|
try:
|
|
import ustruct as struct
|
|
except:
|
|
import struct
|
|
|
|
# work out configuration values
|
|
is_64bit = struct.calcsize("P") == 8
|
|
# 0 = none, 1 = long long, 2 = mpz
|
|
try:
|
|
dummy = 0x7fffffffffffffff
|
|
try:
|
|
if (0xffffffffffffffff + 1) > 0:
|
|
ll_type = 2
|
|
else:
|
|
ll_type = 1
|
|
except:
|
|
# in case the sum in the if statement above changes to raising an exception on overflow
|
|
ll_type = 1
|
|
except:
|
|
ll_type = 0
|
|
|
|
# This case occurs with time.time() values
|
|
if ll_type != 0:
|
|
print(int(1418774543.))
|
|
print("%d" % 1418774543.)
|
|
if ll_type == 3:
|
|
print(int(2.**100))
|
|
print("%d" % 2.**100)
|
|
else:
|
|
print(int(1073741823.))
|
|
print("%d" % 1073741823.)
|
|
|
|
testpass = True
|
|
p2_rng = ((30,63,1024),(62,63,1024))[is_64bit][ll_type]
|
|
for i in range(0,p2_rng):
|
|
bitcnt = len(bin(int(2.**i))) - 3;
|
|
if i != bitcnt:
|
|
print('fail: 2**%u was %u bits long' % (i, bitcnt));
|
|
testpass = False
|
|
print("power of 2 test: %s" % (testpass and 'passed' or 'failed'))
|
|
|
|
testpass = True
|
|
p10_rng = ((9,18,23),(18,18,23))[is_64bit][ll_type]
|
|
for i in range(0,p10_rng):
|
|
digcnt = len(str(int(10.**i))) - 1;
|
|
if i != digcnt:
|
|
print('fail: 10**%u was %u digits long' % (i, digcnt));
|
|
testpass = False
|
|
print("power of 10 test: %s" % (testpass and 'passed' or 'failed'))
|
|
|
|
def fp2int_test(num, name, should_fail):
|
|
try:
|
|
x = int(num)
|
|
passed = ~should_fail
|
|
except:
|
|
passed = should_fail
|
|
print('%s: %s' % (name, passed and 'passed' or 'failed'))
|
|
|
|
if ll_type != 2:
|
|
if ll_type == 0:
|
|
if is_64bit:
|
|
neg_bad_fp = -1.00000005*2.**62.
|
|
pos_bad_fp = 2.**62.
|
|
neg_good_fp = -2.**62.
|
|
pos_good_fp = 0.99999993*2.**62.
|
|
else:
|
|
neg_bad_fp = -1.00000005*2.**30.
|
|
pos_bad_fp = 2.**30.
|
|
neg_good_fp = -2.**30.
|
|
pos_good_fp = 0.9999999499*2.**30.
|
|
else:
|
|
neg_bad_fp = -0.51*2.**64.
|
|
pos_bad_fp = 2.**63.
|
|
neg_good_fp = -2.**63.
|
|
pos_good_fp = 1.9999998*2.**62.
|
|
|
|
fp2int_test(neg_bad_fp, 'neg bad', True)
|
|
fp2int_test(pos_bad_fp, 'pos bad', True)
|
|
fp2int_test(neg_good_fp, 'neg good', False)
|
|
fp2int_test(pos_good_fp, 'pos good', False)
|
|
else:
|
|
fp2int_test(-1.9999999999999981*2.**1023., 'large neg', False)
|
|
fp2int_test(1.9999999999999981*2.**1023., 'large pos', False)
|
|
|
|
fp2int_test(float('inf'), 'inf test', True)
|
|
fp2int_test(float('nan'), 'NaN test', True)
|
|
|
|
# test numbers < 1 (this used to fail; see issue #1044)
|
|
fp2int_test(0.0001, 'small num', False)
|
|
struct.pack('I', int(1/2))
|