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Add a DEAL_II_ASSUME macro. #16393

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Add a DEAL_II_ASSUME macro. #16393

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36 changes: 26 additions & 10 deletions include/deal.II/base/exceptions.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1520,6 +1520,30 @@ namespace deal_II_exceptions



#if defined(__clang__)
# define DEAL_II_ASSUME(expr) __builtin_assume(expr)
#elif defined(__GNUC__) && !defined(__ICC)
# if __GNUC__ >= 13
# define DEAL_II_ASSUME(expr) __attribute__((__assume__(expr)))
# else
/* no way with GCC to express this without evaluating 'expr' */
# define DEAL_II_ASSUME(expr) \
do \
{ \
} \
while (false)
# endif
#elif defined(_MSC_VER) || defined(__ICC)
# define DEAL_II_ASSUME(expr) __assume(expr)
#else
# define DEAL_II_ASSUME(expr) \
do \
{ \
} \
while (false)
#endif


/**
* A macro that serves as the main routine in the exception mechanism for debug
* mode error checking. It asserts that a certain condition is fulfilled,
Expand Down Expand Up @@ -1638,11 +1662,7 @@ namespace deal_II_exceptions
# endif /*ifdef KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST*/
# endif /*KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST*/
#else /*ifdef DEBUG*/
# define Assert(cond, exc) \
do \
{ \
} \
while (false)
# define Assert(cond, exc) DEAL_II_ASSUME(cond)
#endif /*ifdef DEBUG*/


Expand Down Expand Up @@ -1694,11 +1714,7 @@ namespace deal_II_exceptions
while (false)
# endif /*ifdef DEAL_II_HAVE_BUILTIN_EXPECT*/
#else
# define AssertNothrow(cond, exc) \
do \
{ \
} \
while (false)
# define AssertNothrow(cond, exc) DEAL_II_ASSUME(cond)
#endif

/**
Expand Down