Xcode Timer Snippet.

gistfile1.txt

Snippet Configuration: https://www.dropbox.com/s/n5c5wvkmmssihrb/Screenshot%202015-03-12%2015.57.17.png

Timer.m

{
    uint64_t t_start = mach_absolute_time();
    <#code#>
    uint64_t t_end = mach_absolute_time();
    
    struct mach_timebase_info t_info;
    mach_timebase_info(&t_info);
    double_t elapsed = (t_end - t_start) * t_info.numer / (t_info.denom * (double_t)1e6);
    NSLog(@"Elapsed: %fms", elapsed);
}

1. Paste the raw code into Xcode.
2. Expand the "Utilities" pane (Shift Option Command 2)
3. Highlight the code
4. Drag the into the Snippets window
5. Configure as desired. The image in the gist shows a full configuration.