pub fn bitwise_count8<T: UnsignedInteger>(m: &[T; 8]) -> [T; 4]Expand description
Computes the population count for each bit position across 8 input masks.
Returns four masks [bit0, bit1, bit2, bit3] that encode, per bit position, the 4-bit count
of how many of the 8 inputs have that bit set.
For example, if a given bit is set in 5 inputs, then that bit would be set in bit0 and bit2.
If a given bit is set in all 8 inputs, then that bit would only be set in bit3.
ยงExamples
let [bit0, bit1, bit2, bit3] = bitwise_count8::<u16>(&[
0b100000000,
0b110000000,
0b111000000,
0b111100000,
0b111110000,
0b111111000,
0b111111100,
0b111111110,
]);
assert_eq!(bit0, 0b010101010);
assert_eq!(bit1, 0b011001100);
assert_eq!(bit2, 0b011110000);
assert_eq!(bit3, 0b100000000);let [bit0, bit1, bit2, bit3] = bitwise_count8::<u64>(&[
0b00111000_01001000_10000111_11111111_10111000_11100010_00110010_01010011,
0b01110000_00100111_01011101_11011000_10001100_00011000_10100101_00110010,
0b00000101_11010011_10110011_10000000_00000000_11110110_00000101_11111010,
0b01101001_01001100_00111001_01101100_00110111_00101011_00010101_10011101,
0b00011100_11101111_00111111_01101011_00011101_01011110_11101101_10101101,
0b10111100_11101111_00001001_10100100_01010110_10101011_01011000_11111100,
0b11110110_00010001_11101111_00101101_01110111_10000011_11110110_10101011,
0b01110001_01100010_01111101_01001000_01011001_10110100_11100110_11100000,
]);
assert_eq!(bit0, 0b00000011_10000011_11110100_01100001_01100110_11100101_00100010_00011100);
assert_eq!(bit1, 0b10110001_11010000_11001000_00011011_11110010_01000111_00001110_10100100);
assert_eq!(bit2, 0b01111100_01101111_00111110_11101100_00011101_10111010_11110101_11111011);
assert_eq!(bit3, 0b00000000_00000000_00000001_00000000_00000000_00000000_00000000_00000000);