tiny.simd.mirror

1pub fn mirror(coord: i64, size: usize) usize {2    std.debug.assert(size != 0);3    std.debug.assert(size <= std.math.maxInt(i64));4    const size_u64: u64 = @intCast(size);5    const period = 2 * size_u64;6    const phase = if (coord >= 0)7        @as(u64, @intCast(coord)) % period8    else blk: {9        const bits: u64 = @bitCast(coord);10        const remainder = (0 -% bits) % period;11        break :blk if (remainder == 0) 0 else period - remainder;12    };13    if (phase < size_u64) return @intCast(phase);14    return @intCast(period - 1 - phase);15}

1pub const mirror = image.mirror;