#if defined(PETSC_USE_REAL___FLOAT128) PetscErrorCode PetscIsInfOrNanScalar(PetscScalar a)
Notes: uses the C99 standard isinf() and isnan() on systems where they exist. Otherwises uses ( (a - a) != 0.0), note that some optimizing compiles compile out this form, thus removing the check.
Level:beginner
Location:src/sys/utils/mathinf.c
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