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Introduce __insn_barrier(), designed to prevent instruction re-ordering

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with minimal side-effects across its location in the source code.
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pk 2003-11-16 11:07:57 +00:00
parent e0f60703ab
commit 97bb6a9d59
1 changed files with 12 additions and 2 deletions
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14
sys/arch/sparc/include/cdefs.h
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@ -1,8 +1,18 @@
/* $NetBSD: cdefs.h,v 1.8 1999/03/20 01:40:26 thorpej Exp $ */
/* $NetBSD: cdefs.h,v 1.9 2003/11/16 11:07:57 pk Exp $ */
#ifndef _MACHINE_CDEFS_H_
#define _MACHINE_CDEFS_H_
/* No arch-specific cdefs. */
#ifdef __GNUC__
/*
* A statement designed to tell the compiler not to re-order instructions
* across this barrier. It does not generate any code by itself and the
* harmless `clobber' of %g0 prevents other side-effects such as re-loading
* registers from memory.
*/
#define __insn_barrier() __asm __volatile("": : : "g0")
#else
#define __insn_barrier() /*void*/
#endif
#endif /* !_MACHINE_CDEFS_H_ */