2bf0944d-4bd7-490c-b58f-4459c23eef14

Committed 19 Oct 2024 11:20AM UTC coverage: 77.639% (-2.6%) from 80.19%

Build # 2bf0944d-4bd7-490c-b58f-4459c23eef14

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push

circleci

Committed by

Nic30

Commit Message

feat:  Bits3t.__rshift__ fast case

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69.71

/pyMathBitPrecise/bit_utils.py

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-
from typing import List, Tuple, Generator, Union, Optional

from pyMathBitPrecise.utils import grouper


def mask(bits: int) -> int:
    """
    Generate mask of specified size (sequence of '1')
    """
    return (1 << bits) - 1


def bit_field(_from: int, to: int) -> int:
    """
    Generate int which has bits '_from' to 'to' set to '1'

    :note: _from 0 to 1 -> '1'
    """
    w = to - _from
    return mask(w) << _from


def get_bit(val: int, bitNo: int) -> int:
    """
    Get bit from int
    """
    return (val >> bitNo) & 1


def get_bit_range(val: int, bitsStart: int, bitsLen: int) -> int:
    """
    Get sequence of bits from an int value
    """
    val >>= bitsStart
    return val & mask(bitsLen)


def clean_bit(val: int, bitNo: int) -> int:
    """
    Set a specified bit to '0'
    """
    return val & ~(1 << bitNo)


def set_bit(val: int, bitNo: int) -> int:
    """
    Set a specified bit to '1'
    """
    return val | (1 << bitNo)


def toggle_bit(val: int, bitNo: int) -> int:
    """
    Toggle specified bit in int
    """
    return val ^ (1 << bitNo)


def set_bit_range(val: int, bitStart: int, bitsLen: int, newBits: int) -> int:
    """
    Set specified range of bits in int to a specified value
    """
    _mask = mask(bitsLen)
    newBits &= _mask

    _mask <<= bitStart
    newBits <<= bitStart

    return (val & ~_mask) | newBits


def bit_set_to(val: int, bitNo: int, bitVal: int) -> int:
    """
    Set specified bit in int to a specified value
    """
    if bitVal == 0:
        return clean_bit(val, bitNo)
    elif bitVal == 1:
        return set_bit(val, bitNo)
    else:
        raise ValueError(("Invalid value of bit to set", bitVal))


def apply_set_and_clear(val: int, set_flag: int, clear_flag: int):
    """
    :param val: an input value of the flag(s)
    :param set_flag: a mask of bits to set to 1
    :param clear_flag: a mask of bits to set to 0
    :note: set has higher priority

    :return: new value of the flag
    """
    return (val & ~clear_flag) | set_flag


def align(val: int, lowerBitCntToAlign: int) -> int:
    """
    Cut off lower bits to align a int value.
    """
    val = val >> lowerBitCntToAlign
    return val << lowerBitCntToAlign


def align_with_known_width(val, width: int, lowerBitCntToAlign: int):
    """
    Does same as :func:`~.align` just with the known width of val
    """
    return val & (mask(width - lowerBitCntToAlign) << lowerBitCntToAlign)


def iter_bits(val: int, length: int) -> Generator[int, None, None]:
    """
    Iterate bits in int. LSB first.
    """
    for _ in range(length):
        yield val & 1
        val >>= 1


def iter_bits_sequences(val: int, length: int) -> Generator[Tuple[int, int], None, None]:
    """
    Iter tuples (bitVal, number of same bits), lsb first
    """
    assert length > 0, length
    assert val >= 0
    # start of new bit seqence
    w = 1
    valBit = val & 1
    val >>= 1
    foundBit = valBit
    for _ in range(length-1):
        # extract single bit from val
        valBit = val & 1
        val >>= 1
        # check if it fits into current bit sequence
        if valBit == foundBit:
            w += 1
        else:
            # end of sequence of same bits
            yield (foundBit, w)
            foundBit = valBit
            w = 1

    if w != 0:
        yield (foundBit, w)


def to_signed(val: int, width: int) -> int:
    """
    Convert unsigned int to negative int which has same bits set (emulate sign overflow).

    :note: bits in value are not changed, just python int object
        has signed flag set properly. And number is in expected range.
    """
    if val > 0:
        msb = 1 << (width - 1)
        if val & msb:
            val -= mask(width) + 1
    return val


def to_unsigned(val, width) -> int:
    if val < 0:
        return val & mask(width)
    else:
        return val


def mask_bytes(val: int, byte_mask: int, mask_bit_length: int) -> int:
    """
    Use each bit in byte_mask as a mask for each byte in val.

    :note: Useful for masking of value for HW interfaces where mask
        is represented by a vector of bits where each bit is mask
        for byte in data vector.
    """
    res = 0
    for i, m in enumerate(iter_bits(byte_mask, mask_bit_length)):
        if m:
            res |= (val & 0xff) << (i * 8)
        val >>= 8
    return res


INT_BASES = {
    "b": 2,
    "o": 8,
    "d": 10,
    "h": 16,
}


class ValidityError(ValueError):
    """
    Value is not fully defined and thus can not be used
    """


def normalize_slice(s: slice, obj_width: int) -> Tuple[int, int]:
    start, stop, step = s.start, s.stop, s.step
    if step is not None and step != -1:
        raise NotImplementedError(s.step)
    else:
        step = -1
    if stop is None:
        stop = 0
    else:
        stop = int(stop)

    if start is None:
        start = int(obj_width)
    else:
        start = int(start)
    # n...0
    if start <= stop:
        raise IndexError(s)
    firstBitNo = stop
    size = start - stop
    if start < 0 or stop < 0 or size < 0 or start > obj_width:
        raise IndexError(s)

    return firstBitNo, size


def reverse_bits(val, width):
    """
    Reverse bits in integer value of specified width
    """
    v = 0
    for i in range(width):
        v |= (get_bit(val, width - i - 1) << i)
    return v


def extend_to_size(collection, items, pad=0):
    toAdd = items - len(collection)
    assert toAdd >= 0
    for _ in range(toAdd):
        collection.append(pad)

    return collection


def bit_list_reversed_endianity(bitList, extend=True):
    w = len(bitList)
    i = w

    items = []
    while i > 0:
        # take last 8 bytes or rest
        lower = max(i - 8, 0)
        b = bitList[lower:i]
        if extend:
            extend_to_size(b, 8)
        items.extend(b)
        i -= 8

    return items


def bit_list_reversed_bits_in_bytes(bitList: List[int], extend=None):
    "Byte reflection  (0x0f -> 0xf0)"
    w = len(bitList)
    if extend is None:
        assert w % 8 == 0
    tmp = []
    for db in grouper(8, bitList, padvalue=0):
        tmp.extend(reversed(db))

    if not extend and len(tmp) != w:
        rem = w % 8
        # rm zeros from [0, 0, 0, 0, 0, d[2], d[1], d[0]] like
        tmp = tmp[:w - rem] + tmp[-rem:]

    return tmp


def byte_list_to_be_int(_bytes: List[int]):
    """
    In input list LSB first, in result little endian ([1, 0] -> 0x0001)
    """
    return int_list_to_int(_bytes, 8)


def bit_list_to_int(bitList: List[int]):
    """
    In input list LSB first, in result little endian ([0, 1] -> 0b10)
    """
    res = 0
    for i, r in enumerate(bitList):
        res |= (r & 0x1) << i
    return res


def int_list_to_int(il: List[int], item_width: int):
    """
    [0x0201, 0x0403] -> 0x04030201
    """
    v = 0
    for i, b in enumerate(il):
        v |= b << (i * item_width)

    return v


def int_to_int_list(v: int, item_width: int, number_of_items: int):
    """
    opposite of :func:`~.int_list_to_int`
    """
    item_mask = mask(item_width)
    res = []
    for _ in range(number_of_items):
        res.append(v & item_mask)
        v >>= item_width

    assert v == 0, ("there should be nothing left, the value is larger", v)
    return res


def reverse_byte_order(val: "Bits3val"):
    """
    Reverse byteorder (littleendian/bigendian) of signal or value
    """
    w = val._dtype.bit_length()
    i = w
    items = []

    while i > 0:
        # take last 8 bytes or rest
        lower = max(i - 8, 0)
        items.append(val[i:lower])
        i -= 8
    
    # Concat(*items)
    top = None
    for s in items:
        if top is None:
            top = s
        else:
            top = top._concat(s)
    return top

def is_power_of_2(v: Union["Bits3val", int]):
    return ~(v & (v - 1))

def next_power_of_2(v: Union["Bits3val", int], width:Optional[int]=None):
    # depend on the fact that v < 2^width
    v = v - 1
    if isinstance(v, int):
        v = to_unsigned(v, width)
    else:
        width = v._dtype.bit_length()

    i = 1
    while True:
        v |= (v >> i) # 1, 2, 4, 8, 16 for 32b
        i <<= 1
        if i > width // 2:
            break
    
    v = v + 1

    if isinstance(v, int):
        v &= mask(width)
    return v

1	#!/usr/bin/env python3
2	# -- coding: UTF-8 --
3	from typing import List, Tuple, Generator, Union, Optional	1✔
4
5	from pyMathBitPrecise.utils import grouper	1✔
6
7
8	def mask(bits: int) -> int:	1✔
9	"""
10	Generate mask of specified size (sequence of '1')
11	"""
12	return (1 << bits) - 1	1✔
13
14
15	def bit_field(_from: int, to: int) -> int:	1✔
16	"""
17	Generate int which has bits '_from' to 'to' set to '1'
18
19	:note: _from 0 to 1 -> '1'
20	"""
21	w = to - _from	1✔
22	return mask(w) << _from	1✔
23
24
25	def get_bit(val: int, bitNo: int) -> int:	1✔
26	"""
27	Get bit from int
28	"""
29	return (val >> bitNo) & 1	1✔
30
31
32	def get_bit_range(val: int, bitsStart: int, bitsLen: int) -> int:	1✔
33	"""
34	Get sequence of bits from an int value
35	"""
36	val >>= bitsStart	1✔
37	return val & mask(bitsLen)	1✔
38
39
40	def clean_bit(val: int, bitNo: int) -> int:	1✔
41	"""
42	Set a specified bit to '0'
43	"""
44	return val & ~(1 << bitNo)	1✔
45
46
47	def set_bit(val: int, bitNo: int) -> int:	1✔
48	"""
49	Set a specified bit to '1'
50	"""
51	return val \| (1 << bitNo)	1✔
52
53
54	def toggle_bit(val: int, bitNo: int) -> int:	1✔
55	"""
56	Toggle specified bit in int
57	"""
58	return val ^ (1 << bitNo)	1✔
59
60
61	def set_bit_range(val: int, bitStart: int, bitsLen: int, newBits: int) -> int:	1✔
62	"""
63	Set specified range of bits in int to a specified value
64	"""
65	_mask = mask(bitsLen)	1✔
66	newBits &= _mask	1✔
67
68	_mask <<= bitStart	1✔
69	newBits <<= bitStart	1✔
70
71	return (val & ~_mask) \| newBits	1✔
72
73
74	def bit_set_to(val: int, bitNo: int, bitVal: int) -> int:	1✔
75	"""
76	Set specified bit in int to a specified value
77	"""
78	if bitVal == 0:	1✔
79	return clean_bit(val, bitNo)	1✔
80	elif bitVal == 1:	1!
81	return set_bit(val, bitNo)	1✔
82	else:
UNCOV 83	raise ValueError(("Invalid value of bit to set", bitVal))	×
84
85
86	def apply_set_and_clear(val: int, set_flag: int, clear_flag: int):	1✔
87	"""
88	:param val: an input value of the flag(s)
89	:param set_flag: a mask of bits to set to 1
90	:param clear_flag: a mask of bits to set to 0
91	:note: set has higher priority
92
93	:return: new value of the flag
94	"""
95	return (val & ~clear_flag) \| set_flag	1✔
96
97
98	def align(val: int, lowerBitCntToAlign: int) -> int:	1✔
99	"""
100	Cut off lower bits to align a int value.
101	"""
102	val = val >> lowerBitCntToAlign	1✔
103	return val << lowerBitCntToAlign	1✔
104
105
106	def align_with_known_width(val, width: int, lowerBitCntToAlign: int):	1✔
107	"""
108	Does same as :func:`~.align` just with the known width of val
109	"""
UNCOV 110	return val & (mask(width - lowerBitCntToAlign) << lowerBitCntToAlign)	×
111
112
113	def iter_bits(val: int, length: int) -> Generator[int, None, None]:	1✔
114	"""
115	Iterate bits in int. LSB first.
116	"""
117	for _ in range(length):	1✔
118	yield val & 1	1✔
119	val >>= 1	1✔
120
121
122	def iter_bits_sequences(val: int, length: int) -> Generator[Tuple[int, int], None, None]:	1✔
123	"""
124	Iter tuples (bitVal, number of same bits), lsb first
125	"""
126	assert length > 0, length	×
UNCOV 127	assert val >= 0	×
128	# start of new bit seqence
129	w = 1	×
130	valBit = val & 1	×
131	val >>= 1	×
132	foundBit = valBit	×
UNCOV 133	for _ in range(length-1):	×
134	# extract single bit from val
135	valBit = val & 1	×
UNCOV 136	val >>= 1	×
137	# check if it fits into current bit sequence
138	if valBit == foundBit:	×
UNCOV 139	w += 1	×
140	else:
141	# end of sequence of same bits
142	yield (foundBit, w)	×
143	foundBit = valBit	×
UNCOV 144	w = 1	×
145
146	if w != 0:	×
UNCOV 147	yield (foundBit, w)	×
148
149
150	def to_signed(val: int, width: int) -> int:	1✔
151	"""
152	Convert unsigned int to negative int which has same bits set (emulate sign overflow).
153
154	:note: bits in value are not changed, just python int object
155	has signed flag set properly. And number is in expected range.
156	"""
157	if val > 0:	1✔
158	msb = 1 << (width - 1)	1✔
159	if val & msb:	1✔
160	val -= mask(width) + 1	1✔
161	return val	1✔
162
163
164	def to_unsigned(val, width) -> int:	1✔
165	if val < 0:	1!
166	return val & mask(width)	1✔
167	else:
UNCOV 168	return val	×
169
170
171	def mask_bytes(val: int, byte_mask: int, mask_bit_length: int) -> int:	1✔
172	"""
173	Use each bit in byte_mask as a mask for each byte in val.
174
175	:note: Useful for masking of value for HW interfaces where mask
176	is represented by a vector of bits where each bit is mask
177	for byte in data vector.
178	"""
179	res = 0	1✔
180	for i, m in enumerate(iter_bits(byte_mask, mask_bit_length)):	1✔
181	if m:	1✔
182	res \|= (val & 0xff) << (i * 8)	1✔
183	val >>= 8	1✔
184	return res	1✔
185
186
187	INT_BASES = {	1✔
188	"b": 2,
189	"o": 8,
190	"d": 10,
191	"h": 16,
192	}
193
194
195	class ValidityError(ValueError):	1✔
196	"""
197	Value is not fully defined and thus can not be used
198	"""
199
200
201	def normalize_slice(s: slice, obj_width: int) -> Tuple[int, int]:	1✔
202	start, stop, step = s.start, s.stop, s.step	1✔
203	if step is not None and step != -1:	1✔
204	raise NotImplementedError(s.step)
205	else:
206	step = -1	1✔
207	if stop is None:	1✔
208	stop = 0	1✔
209	else:
210	stop = int(stop)	1✔
211
212	if start is None:	1✔
213	start = int(obj_width)	1✔
214	else:
215	start = int(start)	1✔
216	# n...0
217	if start <= stop:	1✔
218	raise IndexError(s)	1✔
219	firstBitNo = stop	1✔
220	size = start - stop	1✔
221	if start < 0 or stop < 0 or size < 0 or start > obj_width:	1✔
222	raise IndexError(s)	1✔
223
224	return firstBitNo, size	1✔
225
226
227	def reverse_bits(val, width):	1✔
228	"""
229	Reverse bits in integer value of specified width
230	"""
231	v = 0	1✔
232	for i in range(width):	1✔
233	v \|= (get_bit(val, width - i - 1) << i)	1✔
234	return v	1✔
235
236
237	def extend_to_size(collection, items, pad=0):	1✔
238	toAdd = items - len(collection)	1✔
239	assert toAdd >= 0	1✔
240	for _ in range(toAdd):	1✔
241	collection.append(pad)	1✔
242
243	return collection	1✔
244
245
246	def bit_list_reversed_endianity(bitList, extend=True):	1✔
247	w = len(bitList)	1✔
248	i = w	1✔
249
250	items = []	1✔
251	while i > 0:	1✔
252	# take last 8 bytes or rest
253	lower = max(i - 8, 0)	1✔
254	b = bitList[lower:i]	1✔
255	if extend:	1!
256	extend_to_size(b, 8)	1✔
257	items.extend(b)	1✔
258	i -= 8	1✔
259
260	return items	1✔
261
262
263	def bit_list_reversed_bits_in_bytes(bitList: List[int], extend=None):	1✔
264	"Byte reflection (0x0f -> 0xf0)"
265	w = len(bitList)	1✔
266	if extend is None:	1!
267	assert w % 8 == 0	1✔
268	tmp = []	1✔
269	for db in grouper(8, bitList, padvalue=0):	1✔
270	tmp.extend(reversed(db))	1✔
271
272	if not extend and len(tmp) != w:	1!
UNCOV 273	rem = w % 8	×
274	# rm zeros from [0, 0, 0, 0, 0, d[2], d[1], d[0]] like
UNCOV 275	tmp = tmp[:w - rem] + tmp[-rem:]	×
276
277	return tmp	1✔
278
279
280	def byte_list_to_be_int(_bytes: List[int]):	1✔
281	"""
282	In input list LSB first, in result little endian ([1, 0] -> 0x0001)
283	"""
UNCOV 284	return int_list_to_int(_bytes, 8)	×
285
286
287	def bit_list_to_int(bitList: List[int]):	1✔
288	"""
289	In input list LSB first, in result little endian ([0, 1] -> 0b10)
290	"""
291	res = 0	1✔
292	for i, r in enumerate(bitList):	1✔
293	res \|= (r & 0x1) << i	1✔
294	return res	1✔
295
296
297	def int_list_to_int(il: List[int], item_width: int):	1✔
298	"""
299	[0x0201, 0x0403] -> 0x04030201
300	"""
301	v = 0	1✔
302	for i, b in enumerate(il):	1✔
303	v \|= b << (i * item_width)	1✔
304
305	return v	1✔
306
307
308	def int_to_int_list(v: int, item_width: int, number_of_items: int):	1✔
309	"""
310	opposite of :func:`~.int_list_to_int`
311	"""
312	item_mask = mask(item_width)	1✔
313	res = []	1✔
314	for _ in range(number_of_items):	1✔
315	res.append(v & item_mask)	1✔
316	v >>= item_width	1✔
317
318	assert v == 0, ("there should be nothing left, the value is larger", v)	1✔
319	return res	1✔
320
321
322	def reverse_byte_order(val: "Bits3val"):	1✔
323	"""
324	Reverse byteorder (littleendian/bigendian) of signal or value
325	"""
326	w = val._dtype.bit_length()	×
327	i = w	×
UNCOV 328	items = []	×
329
UNCOV 330	while i > 0:	×
331	# take last 8 bytes or rest
332	lower = max(i - 8, 0)	×
333	items.append(val[i:lower])	×
UNCOV 334	i -= 8	×
335
336	# Concat(*items)
337	top = None	×
338	for s in items:	×
339	if top is None:	×
UNCOV 340	top = s	×
341	else:
342	top = top._concat(s)	×
UNCOV 343	return top	×
344
345	def is_power_of_2(v: Union["Bits3val", int]):	1✔
UNCOV 346	return ~(v & (v - 1))	×
347
348	def next_power_of_2(v: Union["Bits3val", int], width:Optional[int]=None):	1✔
349	# depend on the fact that v < 2^width
UNCOV 350	v = v - 1	×
UNCOV 351	if isinstance(v, int):	×
UNCOV 352	v = to_unsigned(v, width)	×
353	else:
UNCOV 354	width = v._dtype.bit_length()	×
355
UNCOV 356	i = 1	×
UNCOV 357	while True:	×
UNCOV 358	v \|= (v >> i) # 1, 2, 4, 8, 16 for 32b	×
UNCOV 359	i <<= 1	×
UNCOV 360	if i > width // 2:	×
UNCOV 361	break	×
362
UNCOV 363	v = v + 1	×
364
UNCOV 365	if isinstance(v, int):	×
UNCOV 366	v &= mask(width)	×
UNCOV 367	return v	×

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