trigonometry

I am trying to insert intrinsic cos() function call to LLVM pass. My code in a FunctionPass: std::vector<Type *> arg_type; arg_type.push_back(Type::getFloatTy(getGlobalContext())); Function *fun = Intrinsic::getDeclaration(F.getParent(), Intrinsic::cos, arg_type); CallInst* callInst = CallInst::Create(fun, args, Twine("cos"), (Instruction *)&I); When I leave out last line generated IR is: define i32 @main() nounwind uwtable { entry: ... } declare float @llvm.cos.f32(float) nounwind readonly , but with CallInst included all i get is: 0 opt 0x000000000094f4bf 1 opt 0x000000000094f9c9 2

sin and cos functions are slow and need a lot of resources to run on embedded systems. How does one calculate sin and cos functions in a more resource-saving and faster way? pavium To calculate a Taylor or Fourier series is always going to be time-consuming. In an embedded system, you should think about lookup tables . There might also be interesting information on the 'Net about how Hewlett-Packard optimised such calculations in their early scientific calculators. I recall seeing such stuff at the time Noldorin A lookup table with interpolation would without doubt be the most efficient

I was wondering how I would go about using __cos(x) (and respectively __sin(x) ) in the kernel code with CUDA. I looked up in the CUDA manual that there is such a device function however when I implement it the compiler just says that I cannot call a host function in the device. However, I found that there are two sister functions cosf(x) and __cosf(x) the latter of which runs on the SFU and is overall much faster than the original cosf(x) function. The compiler does not complain about the __cosf(x) function of course. Is there a library I'm missing? Am I mistaken about this trig function? As

I am trying to animate an object, let's say its a car. I want it go from point x1,y1,z1 to point x2,y2,z2 . It moves to those points, but it appears to be drifting rather than pointing in the direction of motion. So my question is: how can I solve this issue in my updateframe() event? Could you point me in the direction of some good resources? Thanks. First off how do you represent the road? I recently done exactly this thing and I used Catmull-Rom splines for the road. To orient an object and make it follow the spline path you need to interpolate the current x,y,z position from a t that walks

This is over my head, can someone explain it to me better? http://mathworld.wolfram.com/Reflection.html I'm making a 2d breakout fighting game, so I need the ball to be able to reflect when it hits a wall, paddle, or enemy (or a enemy hits it). all their formula's are like: x_1^'-x_0=v-2(v·n^^)n^^. And I can't fallow that. (What does ' mean or x_0? or ^^?) The formula for reflection is easier to understand if you think to the geometric meaning of the operation of "dot product". The dot product between two 3d vectors is mathematically defined as <a, b> = ax*bx + ay*by + az*bz but it has a nice