https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92123
--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
There is also tree-core.h:
/* Call argument flags. */
/* Nonzero if the argument is not dereferenced recursively, thus only
directly reachable memory is read or written. */
#define EAF_DIRECT (1 << 0)
/* Nonzero if memory reached by the argument is not clobbered. */
#define EAF_NOCLOBBER (1 << 1)
/* Nonzero if the argument does not escape. */
#define EAF_NOESCAPE (1 << 2)
/* Nonzero if the argument is not used by the function. */
#define EAF_UNUSED (1 << 3)
/* Call return flags. */
/* Mask for the argument number that is returned. Lower two bits of
the return flags, encodes argument slots zero to three. */
#define ERF_RETURN_ARG_MASK (3)
/* Nonzero if the return value is equal to the argument number
flags & ERF_RETURN_ARG_MASK. */
#define ERF_RETURNS_ARG (1 << 2)
but eventually specifying some terminology and then consistently using that
might help... Eventually the documentation bits could go to the internals
manual somewhere ('no vops' is also not documented).
