On Tue, Oct 10, 2023 at 11:13 AM J. Gareth Moreton via fpc-devel <fpc-devel@lists.freepascal.org> wrote: > > 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. > > Kit
Results on a modest CPU: CPU = Intel(R) Celeron(R) CPU N3050 @ 1.60GHz ----------------------------------------------------- Pascal control case: 6.71 ns/call Using LEA instruction: 2.09 ns/call Using ADD instructions: 2.05 ns/call 32 bits: Pascal control case: 6.78 ns/call Using LEA instruction: 2.16 ns/call Using ADD instructions: 2.09 ns/call Results show a bit of variance, above numbers are more or less typical. Christo _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel