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Don't provide bogus source operands in some asms. This probably shouldn't
matter, but similar bogusness in npx.c causes compiling without -O to fail. Use __volatile in all asms. Parenthesize macro args. Change the names of the macros to avoid namespace pollution. Remove unnecessary "#ifdef __i386__". Sort #defines. Add comments.
This commit is contained in:
Bruce Evans
parent
f89971dfe7
commit
8793135f2d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=2941
@ -31,28 +31,31 @@
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* SUCH DAMAGE.
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*
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* from: @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93
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* $Id: floatingpoint.h,v 1.4 1993/11/07 17:42:55 wollman Exp $
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*/
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/*
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* IEEE floating point structure and function definitions
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* $Id: floatingpoint.h,v 1.5 1994/08/04 19:16:36 wollman Exp $
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*/
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#ifndef _FLOATINGPOINT_H_
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#define _FLOATINGPOINT_H_
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/*
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* IEEE floating point structure and function definitions
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*/
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/*-
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* XXX the following undocumented pollution is exported:
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* fpsetsticky().
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* FP*FLD, FP*OFF and FP*REG from <machine/ieeefp.h>
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*/
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#include <sys/cdefs.h>
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#include <machine/ieeefp.h>
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#ifdef __GNUC__
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#ifdef __i386__
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#define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr))
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#define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr))
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#define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr))
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#define fldenv(addr) __asm("fldenv %0" : : "m" (*addr))
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#define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
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#define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr)))
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#define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr)))
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#define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr)))
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/*
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* return the contents of a FP register
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@ -62,12 +65,20 @@ __fpgetreg(int _reg)
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{
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unsigned short _mem;
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/*-
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* This is more efficient than it looks. The switch gets optimized
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* away if _reg is constant.
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*
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* The default case only supports _reg == 0. We could handle more
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* registers (e.g., tags) using fnstenv, but the interface doesn't
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* support more.
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*/
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switch(_reg) {
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default:
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fnstcw(&_mem);
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__fnstcw(&_mem);
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break;
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case FP_STKY_REG:
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fnstsw(&_mem);
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__fnstsw(&_mem);
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break;
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}
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return _mem;
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@ -82,15 +93,16 @@ __fpsetreg(int _m, int _reg, int _fld, int _off)
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unsigned _env[7];
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unsigned _p;
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fnstenv(_env);
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/*
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* _reg == 0 could be handled better using fnstcw/fldcw.
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*/
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__fnstenv(_env);
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_p = (_env[_reg] & _fld) >> _off;
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_env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
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fldenv(_env);
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__fldenv(_env);
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return _p;
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}
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#endif /* __i386__ */
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#endif /* __GNUC__ */
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/*
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@ -31,28 +31,31 @@
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* SUCH DAMAGE.
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*
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* from: @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93
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* $Id: floatingpoint.h,v 1.4 1993/11/07 17:42:55 wollman Exp $
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*/
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/*
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* IEEE floating point structure and function definitions
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* $Id: floatingpoint.h,v 1.5 1994/08/04 19:16:36 wollman Exp $
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*/
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#ifndef _FLOATINGPOINT_H_
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#define _FLOATINGPOINT_H_
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/*
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* IEEE floating point structure and function definitions
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*/
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/*-
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* XXX the following undocumented pollution is exported:
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* fpsetsticky().
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* FP*FLD, FP*OFF and FP*REG from <machine/ieeefp.h>
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*/
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#include <sys/cdefs.h>
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#include <machine/ieeefp.h>
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#ifdef __GNUC__
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#ifdef __i386__
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#define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr))
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#define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr))
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#define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr))
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#define fldenv(addr) __asm("fldenv %0" : : "m" (*addr))
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#define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
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#define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr)))
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#define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr)))
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#define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr)))
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/*
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* return the contents of a FP register
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@ -62,12 +65,20 @@ __fpgetreg(int _reg)
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{
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unsigned short _mem;
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/*-
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* This is more efficient than it looks. The switch gets optimized
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* away if _reg is constant.
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*
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* The default case only supports _reg == 0. We could handle more
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* registers (e.g., tags) using fnstenv, but the interface doesn't
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* support more.
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*/
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switch(_reg) {
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default:
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fnstcw(&_mem);
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__fnstcw(&_mem);
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break;
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case FP_STKY_REG:
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fnstsw(&_mem);
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__fnstsw(&_mem);
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break;
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}
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return _mem;
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@ -82,15 +93,16 @@ __fpsetreg(int _m, int _reg, int _fld, int _off)
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unsigned _env[7];
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unsigned _p;
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fnstenv(_env);
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/*
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* _reg == 0 could be handled better using fnstcw/fldcw.
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*/
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__fnstenv(_env);
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_p = (_env[_reg] & _fld) >> _off;
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_env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
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fldenv(_env);
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__fldenv(_env);
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return _p;
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}
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#endif /* __i386__ */
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#endif /* __GNUC__ */
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/*
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