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Enable floating point exceptions on apple

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Clang for apple does not support `fpenableexcept`, so make a special way
to turn them on to help developers debug code. This code is based on the
suggestions at:

https://stackoverflow.com/questions/37819235/how-do-you- enable-floating-point-exceptions-for-clang-in-os-x

https://stackoverflow.com/questions/71821666/trapping-floating-point-exceptions-and-signal-handling-on-apple-silicon

This code is actually disabled because it does not work on all known
platforms (most notably one of the dashboard machines). However, I
would like to keep the code there to assist debugging.
This commit is contained in:
Kenneth Moreland 2023-01-25 14:14:11 -07:00
parent b62d3a5975
commit 4e9c63b629
1 changed files with 39 additions and 0 deletions
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39
vtkm/testing/Testing.h
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@ -36,8 +36,14 @@
#include <math.h>
// Uncomment to turn on floating point exceptions for Mac builds
// This non-portable solution is known to fail for some platforms (such as the dashboard).
//#define VTKM_TEST_APPLE_FPE
#if defined(VTKM_GCC) && !defined(__APPLE__)
#include <fenv.h>
#elif defined(__APPLE__) && defined(__MACH__) && defined(VTKM_TEST_APPLE_FPE)
#include <cfenv>
#endif
// Try to enforce using the correct testing version. (Those that include the
@ -120,6 +126,23 @@ inline void FloatingPointExceptionTrapEnable()
// Turn on floating point exception trapping where available
#if defined(VTKM_GCC) && !defined(__APPLE__)
feenableexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID);
#elif defined(__APPLE__) && defined(__MACH__) && defined(VTKM_TEST_APPLE_FPE)
std::fenv_t fenv;
if (std::fegetenv(&fenv) != 0)
{
return;
}
int excepts = FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID;
#if defined(__arm) || defined(__arm64) || defined(__aarch64__)
// ARM architecture
fenv.__fpcr |= (excepts << 8);
#else
// Intel architecture
// Control flags are masked exceptions, so we have to unset them.
fenv.__control &= ~excepts;
fenv.__mxcsr &= ~(excepts << 7);
#endif
fesetenv(&fenv);
#endif
}
@ -128,6 +151,22 @@ inline void FloatingPointExceptionTrapDisable()
// Turn on floating point exception trapping where available
#if defined(VTKM_GCC) && !defined(__APPLE__)
fedisableexcept(FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID);
#elif defined(__APPLE__) && defined(__MACH__) && defined(VTKM_TEST_APPLE_FPE)
std::fenv_t fenv;
if (std::fegetenv(&fenv) != 0)
{
return;
}
int excepts = FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID;
#if defined(__arm) || defined(__arm64) || defined(__aarch64__)
// ARM architecture
fenv.__fpcr &= ~(excepts << 8);
#else
// Control flags are masked exceptions, so we have to set them.
fenv.__control |= excepts;
fenv.__mxcsr |= excepts << 7;
#endif
fesetenv(&fenv);
#endif
}