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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

log10_int_u8

Private Function
std.math.log10.log10_int_u8
inline fn log10_int_u8(x: u8) u32

Params

  • x: u8

File

math/log10.zig:100
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inline fn log10_int_u8(x: u8) u32 {
    // For better performance, avoid branches by assembling the solution
    // in the bits above the low 8 bits.

    // Adding c1 to val gives 10 in the top bits for val < 10, 11 for val >= 10
    const C1: u32 = 0b11_00000000 - 10; // 758
    // Adding c2 to val gives 01 in the top bits for val < 100, 10 for val >= 100
    const C2: u32 = 0b10_00000000 - 100; // 412

    // Value of top bits:
    //            +c1  +c2  1&2
    //     0..=9   10   01   00 = 0
    //   10..=99   11   01   01 = 1
    // 100..=255   11   10   10 = 2
    return ((x + C1) & (x + C2)) >> 8;
}