Zig 0.17.0-dev (Split by item)

This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig library itself.

bitreverseXi2

bitreverse.bitreverseXi2
inline fn bitreverseXi2(comptime T: type, a: T) T

File

lib/compiler_rt/bitreverse.zig:12

Code

inline fn bitreverseXi2(comptime T: type, a: T) T {
    switch (@bitSizeOf(T)) {
        32 => {
            var t: T = a;
            t = ((t >> 1) & 0x55555555) | ((t & 0x55555555) << 1);
            t = ((t >> 2) & 0x33333333) | ((t & 0x33333333) << 2);
            t = ((t >> 4) & 0x0F0F0F0F) | ((t & 0x0F0F0F0F) << 4);
            t = ((t >> 8) & 0x00FF00FF) | ((t & 0x00FF00FF) << 8);
            t = (t >> 16) | (t << 16);
            return t;
        },
        64 => {
            var t: T = a;
            t = ((t >> 1) & 0x5555555555555555) | ((t & 0x5555555555555555) << 1);
            t = ((t >> 2) & 0x3333333333333333) | ((t & 0x3333333333333333) << 2);
            t = ((t >> 4) & 0x0F0F0F0F0F0F0F0F) | ((t & 0x0F0F0F0F0F0F0F0F) << 4);
            t = ((t >> 8) & 0x00FF00FF00FF00FF) | ((t & 0x00FF00FF00FF00FF) << 8);
            t = ((t >> 16) & 0x0000FFFF0000FFFF) | ((t & 0x0000FFFF0000FFFF) << 16);
            t = (t >> 32) | (t << 32);
            return t;
        },
        128 => {
            var t: T = a;
            t = ((t >> 1) & 0x55555555555555555555555555555555) | ((t & 0x55555555555555555555555555555555) << 1);
            t = ((t >> 2) & 0x33333333333333333333333333333333) | ((t & 0x33333333333333333333333333333333) << 2);
            t = ((t >> 4) & 0x0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F) | ((t & 0x0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F) << 4);
            t = ((t >> 8) & 0x00FF00FF00FF00FF00FF00FF00FF00FF) | ((t & 0x00FF00FF00FF00FF00FF00FF00FF00FF) << 8);
            t = ((t >> 16) & 0x0000FFFF0000FFFF0000FFFF0000FFFF) | ((t & 0x0000FFFF0000FFFF0000FFFF0000FFFF) << 16);
            t = ((t >> 32) & 0x00000000FFFFFFFF00000000FFFFFFFF) | ((t & 0x00000000FFFFFFFF00000000FFFFFFFF) << 32);
            t = (t >> 64) | (t << 64);
            return t;
        },
        else => unreachable,
    }
}