64 bit is slow!!!

[ZeroPoint]

I'm new to Bullet Physics and C++ but managed to make a physics demo where you can knock down tall stacks of boxes. I'm using CodeBlocks with Mingw c++ compiler on Windows 7 64bit. I first made the Bullet Physics libraries and the demo using 64bit Mingw c++. I switched to 32bit Mingw C++ compiler and it is much faster. Anyone else have this issue with 64bit vs 32bit performance?

[Basroil]

Are you sure you have the proper optimizations being done on x64 builds? Namely SIMD optimizations that are sometimes not properly accessed on different compilers and just skipped over.

[ZeroPoint]

Are you sure you have the proper optimizations being done on x64 builds? Namely SIMD optimizations that are sometimes not properly accessed on different compilers and just skipped over.

Well, this time around I selected the x64 compiler flags and tried to rebuild the libraries. Now I'm getting an "internal compiler error: segmentation fault"

C:\bullet-2.81-rev2613\src\BulletCollision\CollisionDispatch\btInternalEdgeUtility.cpp:310:2: internal compiler error: Segmentation fault

[aash29]

I can confirm that x64 build is noticeably slower. Which flags are you talking about?

[ZeroPoint]

I can confirm that x64 build is noticeably slower. Which flags are you talking about?

I'm using CodeBlocks IDE so on the menu bar I select "Settings", then "Compiler". Then select the second tab and there's a long list of checkboxes where you can select how you want your code optimized and also includes a list of CPU's you can select. There's four checkboxes for different 64bit processors you can select. I'm just wondering if Bullet Physics was just developed for 32bit.

[dern23]

That's odd, I just tested the Basic demo compiled with VS2010; x64 was slightly faster for me.