Something new at the end of message. > >> They are equally fast if you turn on register variables and if enough > >> free registers are available (e.g. on a PPC; possibly also on an x86 > >> if you have a very simple loop and little or no variables used both > >> before and after the loop). > > It's wrong. > > bigmac:~/fpc/test jonas$ ppcppc69 -O3 tarr > Target OS: Darwin for PowerPC > Compiling tarr.pp > Assembling testdynstat > Linking tarr > 43 Lines compiled, 0.3 sec > bigmac:~/fpc/test jonas$ ./tarr > Enter dyn array len (1-1000000):1000000 > Total:4789ms > Total:4809ms > bigmac:~/fpc/test jonas$ ./tarr > Enter dyn array len (1-1000000):1000000 > Total:4897ms > Total:4787ms
Wow! I'm glad for PowerPC, but anyhow: (formatted) 3954 4234 4000 4266 3938 4234 3890 4281 3907 4218 I repeat, celeron 2.4 GHz, winxpsp2. In real program registers should be used more efficiently, especially when dealing with SEVERAL arrays, than for support of ONE dynamical array. So, the circumstances described by you can only be reached in special cases. I don't mean to blame/flame or something, I just ask (in developers' mail list): What can I do to speed up dynamical arrays? What can I do to speed up static arrays? NOW: the argument contra static arrays --- almost the same program, but "a[j]:=1" and "b[j]:=1" inside cycles, formatted output: 6641 3952 6655 3970 6610 3938 (I have already roughly specified my system, "fpc -O3rp4 222.pp") _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
