Exe compiled on AMD machine slow on Intel machine

basically what has happened in this case is gremlins did not relocate with you -lol-

please clarify:

• in your game code, did u or did u not optimise for AMD ?
• have u used instructions which were AMD arch specific ?
• is your code written in early C, early C++98 or any C++ earlier than C++0x, c++11?
• have u updated your code to the latest C++ v17 or v20?
• or are u using Java ?
• have u updated to the latest Java SDK v15…..?
• have u updated to the latest JRE 8.21u?
• does your code contain ASM wrapped instructions such: asm mov ecx, 100
• basically u haven't told us enough and left us guessing, why?

Cacks said:
Any ideas?

no, help us please, tell us everything, tell us the whole truth;

until then ?

@ddlox

It's Visual C++ 2019, no AMD specific code, no assembly code, C++ 17, no managed C++

I'm guessing the compiler compiled it specifically for AMD?

you again! usually people reply like 2 or 3 days later ?

you're still not saying everything…

make sure these are set in your properties → c/c++ → all options:

• /std:c++17
• /Ot
• /arch:SSExx or AVXxxx (whichever one is your fancy)

make sure you are not running a DEBUG version of your code

make sure you are not running on an installed DEBUG version of Directx or OGL (or else whichever you're using);

make sure your driver is updated and not buggy, faulty of sort;

if all else fails, yr gonna have to dig in your code and add chronos to check which part of the code is running slow

dig in! ?

@ddlox

I'm building release mode

what's /Qt option?

I have enabled the other 2 flags, it'll take me a while to check, cheers

What about performance with code compiled on the Intel running on the AMD?

/Ot not /Qt: favor fast code

Cacks said:
I have enabled the other 2 flags, it'll take me a while to check, cheers

good ?

@ddlox

found it: last PC was an AMD APU, current PC has NVidia discrete graphics card

NVidia control panel rendering at high quality slowing down my game ticks

cheers

@fleabay

I reduced the render quality settings on NVidia control panel & performance is good again

I will investigate more in future, cheers

well done, thanks for sharing your findings

have fun ?