Zig 0.17.0-dev (Split by item)

?

× Shortcut keys

?: Show these tips

S: Focus search field

Esc: Clear focus & close tips

U: Jump to source code

↑: Move up in search results

↓: Move down in search results

↵: Go to active search result

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 standard library. Private Function

hashLen0To16

Doc Source

Private Function

std.hash.cityhash.CityHash64.hashLen0To16

fn hashLen0To16(str: []const u8) u64

Params

str: []const u8

File

hash/cityhash.zig:204

    fn hashLen0To16(str: []const u8) u64 {
        const len: u64 = @as(u64, str.len);
        if (len >= 8) {
            const mul: u64 = k2 +% len *% 2;
            const a: u64 = fetch64(str.ptr, 0) +% k2;
            const b: u64 = fetch64(str.ptr, str.len - 8);
            const c: u64 = rotr64(b, 37) *% mul +% a;
            const d: u64 = (rotr64(a, 25) +% b) *% mul;
            return hashLen16Mul(c, d, mul);
        }
        if (len >= 4) {
            const mul: u64 = k2 +% len *% 2;
            const a: u64 = fetch32(str.ptr, 0);
            return hashLen16Mul(len +% (a << 3), fetch32(str.ptr, str.len - 4), mul);
        }
        if (len > 0) {
            const a: u8 = str[0];
            const b: u8 = str[str.len >> 1];
            const c: u8 = str[str.len - 1];
            const y: u32 = @as(u32, @intCast(a)) +% (@as(u32, @intCast(b)) << 8);
            const z: u32 = @as(u32, @truncate(str.len)) +% (@as(u32, @intCast(c)) << 2);
            return shiftmix(@as(u64, @intCast(y)) *% k2 ^ @as(u64, @intCast(z)) *% k0) *% k2;
        }
        return k2;
    }