Op 10-10-2023 om 11:13 schreef J. Gareth Moreton via fpc-devel:
Thanks Tomas,
Nothing is broken, but the timing measurement isn't precise enough.
Normally I have a much higher iteration count (e.g. 1,000,000), but I
had reduced it to 10,000 because, coupled with the 1,000 iterations in
the subroutines themselves, would have led to 1,000,000,000 passes and
hence would take in the region of five to ten minutes to complete for
a 16 MHz 386, for example. Rika's suggestion of running as many
iterations as needed until, say, 5 seconds elapses, would help but the
timing measurements would cause a lot of latency and will be imprecise
on very slow routines. Still, let's see if 100,000 gives better
results for you.
I had the same problem, and now it is stable Ryzen 5700X (ZEN3)
Pascal control case: 0.7 ns/call
Using LEA instruction: 0.4 ns/call
Using ADD instructions: 0.7 ns/call
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