The compiler offers builtin constants and functions. Some are only available on certain targets. All builtins use the $$ name prefix.

Builtin constants

These can all safely be used by the user.


The current line as an integer.


The current function name, will return "" on the global level.


The current file name.


Usually the same as $$LINE, but in case of a macro inclusion it returns the line in the macro rather than the line where the macro was included.

Builtin functions

These functions are not guaranteed to exist on all platforms. They are intended for use standard library use, and typically the standard library has macros that wrap these builtins, so they should not be used on its own.


Emits a trap instruction.


Inserts an "unreachable" annotation.


Returns the current "callstack" reference if available. Compiler dependent.


Takes a variable and a value and stores the value as a volatile store.


Takes a variable and returns the value using a volatile load.


Builtin memcpy instruction.


Builtin memset instruction.


Access to the cycle counter register (or similar low latency clock) on supported architectures (e.g. RDTSC on x86), otherwise $$sysclock will yield 0.

Math functions

Functions $$ceil, $$trunc, $$sin, $$cos, $$log, $$log2, $$log10, $$sqrt, $$pow, $$min, $$max, $$exp, $$fma and $$fabs.

Can be applied to float vectors or numbers. Returns the same type.