nim-stew/tests/test_bitops2.nim

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import unittest
import ../stew/bitops2
template test() =
doAssert bitsof(8'u8) == 8
doAssert bitsof(uint64) == 64
doAssert countOnes(0b00000000'u8) == 0
doAssert countOnes(0b01000100'u8) == 2
doAssert countOnes(0b11111111'u64) == 8
doAssert countOnes(0b11000001'u) == 3
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doAssert countZeros(0b00000000'u8) == 8
doAssert countZeros(0b01000100'u8) == 6
doAssert countZeros(0b11111111'u64) == 56
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doAssert firstOne(0b00000000'u8) == 0
doAssert firstOne(0b00000001'u64) == 1
doAssert firstOne(0b00010010'u8) == 2
doAssert firstOne(0b11111111'u8) == 1
doAssert firstOne(0b100000000000000000000000000000000'u64) == 33
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doAssert firstOne(0b00000010_00000000_00000000_00000000_00000000_00000000_00000000_00000000'u64) == 8*7 + 2
doAssert firstOne(0b11111111'u) == 1
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doAssert leadingZeros(0b00000000'u8) == 8
doAssert leadingZeros(0b00000001'u8) == 7
doAssert leadingZeros(0b00100000'u8) == 2
doAssert leadingZeros(0b10000000'u8) == 0
doAssert leadingZeros(0b10000000'u16) == 8
doAssert leadingZeros(0b10000000'u32) == 24
doAssert leadingZeros(0b10000000'u64) == 56
when defined(cpu64):
doAssert leadingZeros(0b00000001'u) == 63
else:
doAssert leadingZeros(0b00000001'u) == 31
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doAssert log2trunc(0b00000000'u8) == -1
doAssert log2trunc(0b00000001'u8) == 0
doAssert log2trunc(0b00000010'u8) == 1
doAssert log2trunc(0b01000000'u8) == 6
doAssert log2trunc(0b01001000'u8) == 6
doAssert log2trunc(0b10001000'u64) == 7
doAssert log2trunc(0b01000000'u) == 6
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doAssert nextPow2(0'u64) == 0
doAssert nextPow2(3'u64) == 4
doAssert nextPow2(4'u32) == 4
doAssert nextPow2(4'u) == 4
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doAssert parity(0b00000001'u8) == 1
doAssert parity(0b10000001'u64) == 0
doAssert parity(0b00000001'u) == 1
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doAssert rotateLeft(0b01000001'u8, 2) == 0b00000101'u8
doAssert rotateRight(0b01000001'u8, 2) == 0b01010000'u8
doAssert rotateLeft(0b01000001'u, 2) == 0b100000100'u
doAssert rotateRight(0b0100000100'u, 2) == 0b01000001'u
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doAssert trailingZeros(0b00000000'u8) == 8
doAssert trailingZeros(0b00100000'u8) == 5
doAssert trailingZeros(0b00100001'u8) == 0
doAssert trailingZeros(0b10000000'u8) == 7
doAssert trailingZeros(0b10000000'u16) == 7
doAssert trailingZeros(0b10000000'u32) == 7
doAssert trailingZeros(0b10000000'u64) == 7
doAssert trailingZeros(0b10000000'u) == 7
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var bit: uint8
setBit(bit, 0)
setBit(bit, 7)
doAssert bit == 0b10000001'u8
clearBit(bit, 0)
doAssert bit == 0b10000000'u8
setBitBE(bit, 1)
doAssert bit == 0b11000000'u8
clearBitBE(bit, 1)
doAssert bit == 0b10000000'u8
toggleBit(bit, 7)
toggleBit(bit, 6)
doAssert bit == 0b01000000'u8
changeBit(bit, 5, true)
changeBit(bit, 6, false)
doAssert bit == 0b00100000'u8
changeBit(bit, 5, true)
changeBit(bit, 6, false)
doAssert bit == 0b00100000'u8 # no change!
changeBitBE(bit, 1, true)
changeBitBE(bit, 2, false)
doAssert bit == 0b01000000'u8
var bit64: uint64
setBit(bit64, 63)
# T(1 shl 63) raises!
doAssert bit64 == 0b10000000_00000000_00000000_00000000_00000000_00000000_00000000_00000000'u64
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proc runtimeTest =
var bytes = @[byte 0b11001101, 0b10010010, 0b00000000, 0b11111111,
0b11000010, 0b00110110, 0b11010110, 0b00101010,
0b01101110, 0b11101001, 0b10101011, 0b00110010]
doAssert getBitsBE(bytes, 0..0, byte) == byte(1)
doAssert getBitsBE(bytes, 1..1, byte) == byte(1)
doAssert getBitsBE(bytes, 2..2, byte) == byte(0)
doAssert getBitsBE(bytes, 6..6, byte) == byte(0)
doAssert getBitsBE(bytes, 7..7, byte) == byte(1)
doAssert getBitsBE(bytes, 0..1, byte) == byte(0b11)
doAssert getBitsBE(bytes, 1..2, byte) == byte(0b10)
doAssert getBitsBE(bytes, 2..3, byte) == byte(0)
doAssert getBitsBE(bytes, 5..6, byte) == byte(0b10)
doAssert getBitsBE(bytes, 6..7, byte) == byte(0b1)
doAssert getBitsBE(bytes, 7..8, byte) == byte(0b11)
doAssert getBitsBE(bytes, 0..2, byte) == byte(0b110)
doAssert getBitsBE(bytes, 1..3, byte) == byte(0b100)
doAssert getBitsBE(bytes, 6..9, byte) == byte(0b110)
doAssert getBitsBE(bytes, 0..3, byte) == byte(0b1100)
doAssert getBitsBE(bytes, 0..7, byte) == byte(0b11001101)
doAssert getBitsBE(bytes, 0..10, uint16) == uint16(0b11001101100)
doAssert getBitsBE(bytes, 0..15, uint16) == uint16(0b1100110110010010)
doAssert getBitsBE(bytes, 1..11, uint16) == uint16(0b10011011001)
doAssert getBitsBE(bytes, 3..18, uint16) == uint16(0b110110010010000)
doAssert getBitsBE(bytes, 35..50, uint16) == uint16(0b1000110110110)
doAssert getBitsBE(bytes, 4..7, uint16) == uint16(0b1101)
doAssert getBitsBE(bytes, 1..29) == 0b10011011001001000000000111111'u64
doAssert getBitsBE(bytes, 1..25, uint32) == 0b1001101100100100000000011'u32
doAssert getBitsBE(bytes, 1..25, uint32) == 0b1001101100100100000000011'u32
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static: test()
suite "bitops2":
test "bitops2_test":
test() # Cannot use unittest at compile time..
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runtimeTest()