fixade.h

来自「关系型数据库 Postgresql 6.5.2」· C头文件 代码 · 共 67 行

/*-------------------------------------------------------------------------
 *
 * fixade.h
 *	  compiler tricks to make things work while POSTGRES does non-native
 *	  dereferences on PA-RISC.
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: fixade.h,v 1.7 1999/05/25 16:10:36 momjian Exp $
 *
 *	 NOTES
 *		This must be included in EVERY source file.
 *
 *-------------------------------------------------------------------------
 */
#ifndef FIXADE_H
#define FIXADE_H

#if !defined(NOFIXADE)

#if defined(HP_S500_ALIGN)
/* ----------------
 *		This cheesy hack turns ON unaligned-access fixup on H-P PA-RISC;
 *		the resulting object files contain code that explicitly handles
 *		realignment on reference, so it slows memory access down by a
 *		considerable factor.  It must be used in conjunction with the +u
 *		flag to cc.  The #pragma is included in c.h to be safe since EVERY
 *		source file that performs unaligned access must contain the #pragma.
 * ----------------
 */
#pragma HP_ALIGN HPUX_NATURAL_S500

#if defined(BROKEN_STRUCT_INIT)
/* ----------------
 *		This is so bogus.  The HP-UX 9.01 compiler has totally broken
 *		struct initialization code.  It actually length-checks ALL
 *		array initializations within structs against the FIRST one that
 *		it sees (when #pragma HP_ALIGN HPUX_NATURAL_S500 is defined)..
 *		we have to throw in this unused structure before struct varlena
 *		is defined.
 *
 *		XXX guess you don't need the #pragma anymore after all :-)
 *		since no one looks at this except me i think i'll just leave
 *		this here for now..
 * ----------------
 */
struct HP_WAY_BOGUS
{
	char		hpwb_bogus[8191 + 1];
};
struct HP_TOO_BOGUS
{
	int			hptb_bogus[8191 + 1];
};

#endif	 /* BROKEN_STRUCT_INIT */
#endif	 /* HP_S500_ALIGN */

#if defined(WEAK_C_OPTIMIZER)
#pragma OPT_LEVEL 1
#endif	 /* WEAK_C_OPTIMIZER */

#endif	 /* !NOFIXADE */

#endif	 /* FIXADE_H */