Bernd's assembler technique will work.
I have no idea why I can't find a description of this (taken from
/usr/include/stdio.h)
#ifndef __gtca
#define __gtca() _gtca()
#ifdef __cplusplus
extern "builtin"
#else
#pragma linkage(_gtca,builtin)
#endif
const void *_gtca(void);
#endif
online. It is mentioned in the XL C/C++ Runtime Library Reference
Since it's not really described, I'm not sure you are allowed to count on it
existing in the future. But in the past, that is the function that I have used
(in 31-bit anyway) to get the CAA directly in C++.
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