Re:Why is strlen so complex in C?
by bjourne on Tuesday August 27, 2019 @04:04AM
(#20807266)
Did you benchmark it? I did and found that on a Core-M with MSVC, the optimized strlen beats the naive one by about 20% and on Xeon with gcc, by about 40%. Depending on string length and other parameters. I would expect the difference to be smaller on more recent processors. But without benchmarking I don't think you can say.
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Yes, I have benchmarked it in the past which is where I got the 4-6x figure from. Maybe it's worth a revisit, but unless the compiler is doing something special with the byte version, I would be surprised if the speedup was much less.
You may have to unroll both to get max speed.
If you could share your benchmark I would be interested to look at it.
Benchmarks are always worth revisits. Mine is here https://github.com/bjourne/c-examples/blob/master/programs/s...