Zig 0.17.0-dev (Split by item)

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copyFixedLength

memcpy.copyFixedLength

inline fn copyFixedLength(
    noalias dest: [*]u8,
    noalias src: [*]const u8,
    comptime len: comptime_int,
) void

File

lib/compiler_rt/memcpy.zig:149

Code

inline fn copyFixedLength(
    noalias dest: [*]u8,
    noalias src: [*]const u8,
    comptime len: comptime_int,
) void {
    @setRuntimeSafety(false);
    comptime assert(std.math.isPowerOfTwo(len));

    const T = if (len >= @sizeOf(Element))
        Element
    else if (len > @sizeOf(usize))
        @Vector(len, u8)
    else
        @Int(.unsigned, len * 8);

    const loop_count = @divExact(len, @sizeOf(T));

    const d: [*]align(1) T = @ptrCast(dest);
    const s: [*]align(1) const T = @ptrCast(src);

    inline for (0..loop_count) |i| {
        d[i] = s[i];
    }
}