40ad8f1666
This is consistent with the other 'micro' modules and allows implementing additional features in Python via e.g. micropython-lib's sys. Note this is a breaking change (not backwards compatible) for ports which do not enable weak links, as "import sys" must now be replaced with "import usys".
102 lines
2.7 KiB
Python
102 lines
2.7 KiB
Python
# check cases converting float to int, relying only on single precision float
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try:
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import ustruct as struct
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import usys as sys
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except:
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import struct
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import sys
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maxsize_bits = 0
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maxsize = sys.maxsize
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while maxsize:
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maxsize >>= 1
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maxsize_bits += 1
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# work out configuration values
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is_64bit = maxsize_bits > 32
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# 0 = none, 1 = long long, 2 = mpz
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ll_type = None
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if is_64bit:
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if maxsize_bits < 63:
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ll_type = 0
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else:
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if maxsize_bits < 31:
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ll_type = 0
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if ll_type is None:
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one = 1
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if one << 65 < one << 62:
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ll_type = 1
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else:
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ll_type = 2
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# basic conversion
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print(int(14187744.0))
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print("%d" % 14187744.0)
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if ll_type == 2:
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print(int(2.0 ** 100))
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print("%d" % 2.0 ** 100)
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testpass = True
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p2_rng = ((30, 63, 127), (62, 63, 127))[is_64bit][ll_type]
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for i in range(0, p2_rng):
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bitcnt = len(bin(int(2.0 ** i))) - 3
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if i != bitcnt:
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print("fail: 2.**%u was %u bits long" % (i, bitcnt))
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testpass = False
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print("power of 2 test: %s" % (testpass and "passed" or "failed"))
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# TODO why does 10**12 fail this test for single precision float?
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testpass = True
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p10_rng = 9
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for i in range(0, p10_rng):
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digcnt = len(str(int(10.0 ** i))) - 1
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if i != digcnt:
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print("fail: 10.**%u was %u digits long" % (i, digcnt))
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testpass = False
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print("power of 10 test: %s" % (testpass and "passed" or "failed"))
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def fp2int_test(num, name, should_fail):
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try:
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x = int(num)
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passed = ~should_fail
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except:
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passed = should_fail
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print("%s: %s" % (name, passed and "passed" or "failed"))
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if ll_type != 2:
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if ll_type == 0:
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if is_64bit:
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neg_bad_fp = -1.00000005 * 2.0 ** 62.0
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pos_bad_fp = 2.0 ** 62.0
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neg_good_fp = -(2.0 ** 62.0)
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pos_good_fp = 0.99999993 * 2.0 ** 62.0
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else:
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neg_bad_fp = -1.00000005 * 2.0 ** 30.0
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pos_bad_fp = 2.0 ** 30.0
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neg_good_fp = -(2.0 ** 30.0)
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pos_good_fp = 0.9999999499 * 2.0 ** 30.0
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else:
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neg_bad_fp = -0.51 * 2.0 ** 64.0
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pos_bad_fp = 2.0 ** 63.0
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neg_good_fp = -(2.0 ** 63.0)
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pos_good_fp = 1.9999998 * 2.0 ** 62.0
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fp2int_test(neg_bad_fp, "neg bad", True)
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fp2int_test(pos_bad_fp, "pos bad", True)
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fp2int_test(neg_good_fp, "neg good", False)
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fp2int_test(pos_good_fp, "pos good", False)
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else:
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fp2int_test(-1.999999879 * 2.0 ** 126.0, "large neg", False)
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fp2int_test(1.999999879 * 2.0 ** 126.0, "large pos", False)
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fp2int_test(float("inf"), "inf test", True)
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fp2int_test(float("-inf"), "inf test", True)
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fp2int_test(float("nan"), "NaN test", True)
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# test numbers < 1 (this used to fail; see issue #1044)
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fp2int_test(0.0001, "small num", False)
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struct.pack("I", int(1 / 2))
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