Search found 199 matches

by greenink
Feb 23, 2019 12:11
Forum: Linux
Topic: Improved autovectorization with pointers, 64 bit linux, gcc 8.20
Replies: 1
Views: 231

Improved autovectorization with pointers, 64 bit linux, gcc 8.20

By using pointers for array operations you may get up to a 4 times speed improvement with Linux 64bit PC and GCC 8.2.0 You may have to experiment with reordering the code to get gcc to autovectorize. You must use the -O 3 compiler command line option:Eg fbc -O 3 test.bas sub multiply(result() as sin...
by greenink
Apr 06, 2017 23:34
Forum: General
Topic: Inline assembler
Replies: 48
Views: 4876

Re: Inline assembler

.align 16 You can also put static data in eg. lea rdi,[rdi+64] jnz flipAlp ret flipshift: .int 1,2,4,8,16,32,64,128 .int 256,512,1024,2048,4096,8192,16384,32768 flipmask: .int 0x80000000,0x80000000,0x80000000,0x80000000 rndphi: .quad 0x9E3779B97F4A7C15 rndsqr3: .quad 0xBB67AE8584CAA73B I forget if ...
by greenink
Feb 16, 2017 2:08
Forum: Tips and Tricks
Topic: Mini chaos
Replies: 5
Views: 871

Re: Mini chaos

I tried the logistic chaos function as well.

Code: Select all

screenres 500,500,32
dim as const single c1=3.99,c2=3.999
dim as single x=.6!,y=.5!
for i as ulong=0 to 9999
   x=c1*x*(1!-x)
   y=c2*y*(1!-y)
   pset (x*499,y*499)
next
getkey
by greenink
Feb 16, 2017 1:59
Forum: Tips and Tricks
Topic: Mini chaos
Replies: 5
Views: 871

Mini chaos

function chaos(x as single,c as single) as single x*=c dim as ulong ptr px=cast(ulong ptr,@x) *px and=&h007fffff *px or=&h3f800000 return x-1! end function screenres 500,500,32 dim as single x=.6!,y=.3! for i as ulong=0 to 9999 x=chaos(x,.932!) y=chaos(y,.133111!) pset (x*499,y*499) next ge...
by greenink
Feb 13, 2017 14:16
Forum: Beginners
Topic: Memory coping with assembler.
Replies: 11
Views: 1117

Re: Memory coping with assembler.

That reminds me that capturing mouse events in Java is very unreliable. Sometimes you get them, sometimes you don't!
by greenink
Feb 09, 2017 0:09
Forum: General
Topic: Returning Arrays
Replies: 21
Views: 1660

Re: Returning Arrays

Are you looking for generic types? Have you tried using macros? Does the code need to be thread safe?
I guess some of the tools available are:
defines
macros
namespaces
pointers
types
scope
by greenink
Feb 08, 2017 16:00
Forum: General
Topic: Returning Arrays
Replies: 21
Views: 1660

Re: Returning Arrays

Yeh, I avoid arrays now for any kind of library code or code that I intend to reuse. I simply work with pointers. Often that means passing an extra length parameter to sub's and functions. The question is - do pointers generally increase or decrease the overall number of lines of code and the comple...
by greenink
Feb 06, 2017 23:55
Forum: Tips and Tricks
Topic: On FreeBASIC's random number generators.
Replies: 35
Views: 3859

Re: On FreeBASIC's random number generators.

You can tune a RNG to a test system's blind spots, and still (literally) see structure in RNG's output in practical applications. That happened to me with one of Vigna's earlier generators. With these short algorithms there is always structure in the output. It only really matters if it causes probl...
by greenink
Feb 05, 2017 4:09
Forum: General
Topic: xor neural net
Replies: 11
Views: 992

Re: xor neural net

by greenink
Feb 03, 2017 12:29
Forum: Windows
Topic: A fast CPRNG
Replies: 67
Views: 6717

Re: A fast CPRNG

I suppose you could try to control markets by correlation breaking, that's maybe one for the Simons institute and the extremely rich Mr. Simons.
by greenink
Feb 03, 2017 6:03
Forum: Windows
Topic: A fast CPRNG
Replies: 67
Views: 6717

Re: A fast CPRNG

Anyway the main use of pseudo-random number generators in most applications is correlation breaking, which fortunately isn't too difficult.
by greenink
Feb 03, 2017 5:58
Forum: Windows
Topic: A fast CPRNG
Replies: 67
Views: 6717

Re: A fast CPRNG

I think a better way or at least faster way to convent a 32/64 bit random integer is just to multiply by a floating point constant (here for 64 bit ULongInt): ' (0,1] function rndSingle() as single return rand()*5.4210107e-20! end function ' [-1,1] function rndSingleSym() as single return cast(longi...
by greenink
Feb 01, 2017 23:42
Forum: General
Topic: xor neural net
Replies: 11
Views: 992

Re: xor neural net

I think you can just use mutation random hill climbing to train a neural net. https://groups.google.com/forum/#!topic/artificial-general-intelligence/TVvry50HEwI It is actually working out quite well. Just slightly alter the weights by some random process and see if that has improved the network. If...
by greenink
Feb 01, 2017 13:40
Forum: Community Discussion
Topic: Best Programming Language
Replies: 34
Views: 5161

Re: Best Programming Language

I suppose so. I think FB has a single pass compiler or something and that's why you need declares. I agree that it's not as big a problem as in C.
by greenink
Jan 31, 2017 22:34
Forum: Community Discussion
Topic: Best Programming Language
Replies: 34
Views: 5161

Re: Best Programming Language

Apparently you can run FreshIDE under Wine, and have it generate native Linux executables. That process is so convoluted, I'll wait. Anyway there would be no performance gains over FB. I'm just interested in reducing the amount of written code while maintaining readability. I'd like to be able to d...

Go to advanced search