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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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/* FPU control word bits. SPARC version.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Miguel de Icaza
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _FPU_CONTROL_H
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#define _FPU_CONTROL_H 1
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#include <features.h>
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/* precision control */
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#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */
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#define _FPU_DOUBLE 0x20000000
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#define _FPU_80BIT 0x30000000
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#define _FPU_SINGLE 0x10000000 /* DO NOT USE */
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/* rounding control / Sparc */
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#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
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#define _FPU_RC_DOWN 0x80000000
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#define _FPU_RC_UP 0xc0000000
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#define _FPU_RC_ZERO 0x40000000
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#define _FPU_RESERVED 0x300000 /* Reserved bits in cw */
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/* Now two recommended cw */
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/* Linux default:
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- extended precision
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- rounding to nearest
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- exceptions on overflow, zero divide and NaN */
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#define _FPU_DEFAULT 0x1f
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/* IEEE: same as above, but exceptions */
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#define _FPU_IEEE 0x0
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/* private namespace. It should only be used by crt0.o. */
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extern unsigned short __fpu_control;
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__BEGIN_DECLS
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/* called by crt0.o. It can be used to manipulate 387 control word. */
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extern void __setfpucw __P ((unsigned short));
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__END_DECLS
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/* Type of the control word. */
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typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
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#define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
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#define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : "=m" (*&cw))
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#if 0
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/* The intel original macros */
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/* Macros for accessing the hardware control word. */
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#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw))
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#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw))
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#endif
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/* Default control word set at startup. */
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extern fpu_control_t __fpu_control;
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__BEGIN_DECLS
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/* Called at startup. It can be used to manipulate fpu control register. */
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extern void __setfpucw __P ((fpu_control_t));
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__END_DECLS
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#endif /* fpu_control.h */
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