Jeppe Johansen-3 wrote > On 03/02/2016 12:48 AM, vfclists . wrote: >> >> >> On 14 February 2016 at 10:06, Serguei TARASSOV <
> serge@ > > > <mailto: > serge@ > >> wrote: >> Another strange effect in FPC. >> Only longint shows correct result. With the integer type the >> optimizer seems to replace type with shortint (16-bits) and I see >> 31902 instead of 4816030. >> >> Is there a reason for this, or is it a bug? > The Integer type depends on what compiler mode you are in, and what > operating system. Sometimes it's 32bit and other times it's 16bit. It was FPC 2.6.4 64 bits in FPC mode on Linux. See the sources to reproduce. Change: TicketsCount: longint; to TicketsCount: integer; Compile: fpc -O2 -Cr- HappyTickets.pas Result: Found 31902 tickets. Elapsed time, msec: 203 I don't see any reason to use 16-bits integer in this code much less in 64-bits mode. I don't test it yet in FPC 3.0 bit 3.0 has other problems with my test: - changing the type of n1-n8 from 0..9 to longint increases the time by 10% - changing the type of n1-n8 from 0..9 to integer doubles the time! On the contrary, in Delphi 10 changing the type of n1-n8 from 0..9 to integer decreases the time by 60% ----- -- Regards, Serguei -- View this message in context: http://free-pascal-general.1045716.n5.nabble.com/Happy-tickets-benchmark-tp5724109p5724403.html Sent from the Free Pascal - General mailing list archive at Nabble.com. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
