Re: Test_LinearMath

2021-12-08T10:25:01+00:00

You probably need to steer this with the setting BT_USE_DOUBLE_PRECISION
This is from btScalar.h in the LinearMath folder:

Code:

            //Do not turn SSE on for ARM (may want to turn on BT_USE_NEON however)#elif (defined (_WIN32) && (_MSC_VER) && _MSC_VER >= 1400) && (!defined (BT_USE_DOUBLE_PRECISION))#if _MSC_VER>1400#define BT_USE_SIMD_VECTOR3#endif#define BT_USE_SSE#ifdef BT_USE_SSE#if (_MSC_FULL_VER >= 170050727)//Visual Studio 2012 can compile SSE4/FMA3 (but SSE4/FMA3 is not enabled by default)#define BT_ALLOW_SSE4#endif //(_MSC_FULL_VER >= 160040219)//BT_USE_SSE_IN_API is disabled under Windows by default, because //it makes it harder to integrate Bullet into your application under Windows //(structured embedding Bullet structs/classes need to be 16-byte aligned)//with relatively little performance gain//If you are not embedded Bullet data in your classes, or make sure that you align those classes on 16-byte boundaries//you can manually enable this line or set it in the build system for a bit of performance gain (a few percent, dependent on usage)//#define BT_USE_SSE_IN_API#endif //BT_USE_SSE#include #endif

So if I read this correctly the use of DOUBLES (8 byte floats) switches off the SIMD and SSE optimizations, that are meant for 4 byte floats?

Statistics: Posted by paulweustink — Wed Dec 08, 2021 10:25 am

Test_LinearMath

2021-09-01T18:14:20+00:00

I have successfully built Bullet3 in VS2019, the Test_* files seem to run ok in x64 Release mode
Except for Test_LinearMath, where I get a "no SIMD enabled ..." message.
If I set BT_USE_SSE_IN_API in the preprocessor directives, I get a long list of errors.

Any help on what is going on, how to get this test to run, use of SIMD in Bullet3, etc. ??

thanks

Kevin

Statistics: Posted by kmanuele — Wed Sep 01, 2021 6:14 pm

Real-Time Physics Simulation Forum

Re: Test_LinearMath

Test_LinearMath