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For each built-in function for IA-16, there is an equally named, uppercase
built-in macro defined—for example, __BUILTIN_IA16_FP_OFF. That
way users can easily query if or if not a specific built-in is implemented
or not.
__builtin_ia16_segment_t __builtin_ia16_selector (unsigned sel)With -mprotected-mode (See IA-16 Options), internally flag sel as a segment selector value which can be loaded into a segment register, and return the flagged value. Without -mprotected-mode, simply return sel.
unsigned __builtin_ia16_FP_OFF (const void __far *fp)Extract the offset portion of the far pointer fp. This function can be used within a static initializer, under certain conditions4.
__builtin_ia16_segment_t __builtin_ia16_near_data_segment (void)Return the segment value for the generic (near) data address space.
__builtin_ia16_segment_t __builtin_ia16_ss (void)Return the value of the stack segment register ss.
This should return the same value as __builtin_ia16_near_data_segment
(), unless the calling function is marked __attribute__
((__no_assume_ss_data__)) (see IA-16 Function Attributes).
Currently, this is allowed if fp is a pointer to a locally defined variable or function, or if fp points to an external variable or function and LTO is not in effect.