numpy allows one to handle IEEE-754 exceptions originating from floating-point by using np.seterr appropriately. However seterr only supports the following keywords each corresponding to a IEEE-754...

The behaviour of the code snippet below is different when compiled with g++-11.1.1 with different optimisation options. The snippet has floating point exception handling enabled. I don't think algo...

I like to run my code with floating point exceptions enabled. I do this under Linux using: feenableexcept( FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW ); So far so good. The issue I am having, is that...

Let's say I have some 16-bytes aligned structure, that just wraps 3xFloat32 array: #[repr(C, align(16))] pub struct Vector(pub [f32; 3]); Now I want to divide two instances of it, like this: us...

I've run into an issue with floating-point comparisons. When comparing a value with NaN using the < operator, I expect the FE_INVALID flag to be set. The < operator should raise the flag acco...

I'm not dividing by zero and there is no float datatype in my code, I still get floating point exception. #include <cmath> #include <cstdio> #include <vector> #include <iostre...

I'm trying to test some of the functions in fenv.h, however, when I compile the below function ld fails with undefined reference to 'feclearexcept' and undefined reference to 'fetestexcept'. I'm ru...

I have an assignment of expaining some seemingly strange behaviors of C code (running on x86). I can easily complete everything else but this one has really confused me. Code snippet 1 outputs -21...

I get into a situation where calculating 1.77e-308/10 triggers an underflow exception, but calculating 1.777e-308/10 does not. This is strange because: Underflow occurs when the true result of ...

As I brought up in this question, gcc is removing (yes, with -O0) a line of code _mm_div_ss(s1, s2); presumably because the result is not saved. However, this should trigger a floating point except...

For days I am struggling hard (but in vain) with the exception masks. I have developed an application that makes heavy floating point calculations on hundreds of thousands of records. Obviously th...

I have a long program, which consists of one header file, and two source files, in the first one I have written the implementations of the functions, and in the second one (which is my main), I cal...

I'd like to play with those traps for educational purpose. A common problem with the default behavior in numerical calculus is that we "miss" the Nan (or +-inf) that appeared in a wrong operation....

To find the cause of floating point variables beeing set to NaN in my C++ program I enabled floating point exceptions like this: #include <fenv.h> feenableexcept(FE_INVALID | FE_OVERFLOW); ...

Is it possible to have an overflow (wrap around) with a double or a float? What will happen if the maximum (or minimum) value is reached on x86 or x64 hardware?

In Delphi 2010 and Delphi 2007 I am using Set8087CW on WebBrowserBeforeNavigate / WebBrowserDocumentComplete to prevent FPU errors inside ActiveX to cripple my application. But somehow this is not...

I have weird problem with this code: if I run it like shown below I get error: An invalid floating point operation occurred. But if I change parameter @Longitude to -98.508730 (notice only las...

I've configured Visual Studio to throw floating point exceptions via the _controlfp function. This works for NAN and INF, but not QNAN. I.e. Quiet NaNs don't cause an exception to be raised. Is the...

Is there any way to set up Visual Studio (just upgraded from 2008 to 2010) to break, as if an assertion failed, whenever any floating point number becomes NaN, QNAN, INF, etc? Up until now I have ...

On Linux, feenableexcept and fedisableexcept can be used to control the generation of SIGFPE interrupts on floating point exceptions. How can I do this on Mac OS X Intel? Inline assembly for enabl...