PetscUnlikelyDebug#

Hints the compiler that the given condition is usually false, eliding the check in optimized mode

Synopsis#

#include <petscmacros.h>
bool PetscUnlikelyDebug(bool cond)

Not Collective; No Fortran Support

Input Parameter#

cond - Boolean expression

Note#

This returns the same truth value, it is only a hint to compilers that the result of cond is likely to be false. When PETSc is compiled in optimized mode this will always return false. Additionally, cond is guaranteed to not be evaluated when PETSc is compiled in optimized mode.

Example usage#

This routine is shorthand for checking both the condition and whether PetscDefined(USE_DEBUG) is true. So

  if (PetscUnlikelyDebug(cond)) {
    foo();
  } else {
    bar();
  }

is equivalent to

  if (PetscDefined(USE_DEBUG)) {
    if (PetscUnlikely(cond)) {
      foo();
    } else {
      bar();
    }
  } else {
    bar();
  }

Level#

advanced

Location#

include/petscmacros.h

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