RE: [PATCH v3 1/2] lib/test_bitops: Add benchmark test for fns()

[David Laight]

From: Kuan-Wei Chiu
> Sent: 01 May 2024 08:17
> 
> Introduce a benchmark test for the fns(). It measures the total time
> taken by fns() to process 1,000,000 test data generated using
> get_random_long() for each n in the range [0, BITS_PER_LONG).
> 
> example:
> test_bitops: fns:          5876762553 ns, 64000000 iterations

Great benchmark....

The compiler almost certainly optimises it all away.

Assigning the result of fns() to a file scope (global) volatile int
should stop that happening.

And a real test would actually check the result - just in case
someone does something silly.

	David

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