[Open64-devel] Attributes for the intrinsic functions and operators

[Chen, K. Y. <kai...@in...>]

Hi,

Could anyone help clarify the meaning of the attributes for intrinsic
functions/operators, and the impact on optimizations? Below is a simple
description based on my understanding, but I am not sure about some fields.

/* defined in "intrn_info.h" */
typedef struct intrn_info_t {
 mBOOL		is_by_val;	// is the parameter passed by value?
 mBOOL		is_pure;		// is it a pure function (as defined
in Fortran or GNU C)?
 mBOOL		has_no_side_effects; // does it have side effects?
 mBOOL		never_returns;  // is it a call that never returns?
 mBOOL		is_actual;	// can it be passed as an actual argument to
a procedure (in Fortran)?
 mBOOL		is_cg_intrinsic; // should it be treated as intrinsic in CG
(e.g., those synchronization primitives using atomic operation)?
 INTRN_RETKIND	return_kind; // the return type
 char		*c_name;		// the name of the intrinsic as seen
in C/C++
 char		*specific_name; // the name for Fortran intrinsic and (??)
 char		*runtime_name; // the name of the function in run-time
library or F77 expression/statement not directly callable
} intrn_info_t;

Thanks,
--Kaiyu