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64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* FPU control word definitions. SH version.
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Copyright (C) 1999, 2000, 2009, 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _FPU_CONTROL_H
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#define _FPU_CONTROL_H
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#include <features.h>
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/* masking of interrupts */
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#define _FPU_MASK_VM 0x0800 /* Invalid operation */
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#define _FPU_MASK_ZM 0x0400 /* Division by zero */
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#define _FPU_MASK_OM 0x0200 /* Overflow */
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#define _FPU_MASK_UM 0x0100 /* Underflow */
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#define _FPU_MASK_IM 0x0080 /* Inexact operation */
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/* rounding control */
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#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
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#define _FPU_RC_ZERO 0x1
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#define _FPU_RESERVED 0xffc00000 /* These bits are reserved. */
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/* The fdlibm code requires strict IEEE double precision arithmetic,
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and no interrupts for exceptions, rounding to nearest. */
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#define _FPU_DEFAULT 0x00080000 /* Default value. */
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#define _FPU_IEEE 0x00080f80 /* Default + exceptions enabled. */
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/* Type of the control word. */
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typedef unsigned int fpu_control_t;
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/* Macros for accessing the hardware control word. */
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#define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw))
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#if defined __GNUC__
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__BEGIN_DECLS
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/* GCC provides this function. */
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extern void __set_fpscr (unsigned long);
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#define _FPU_SETCW(cw) __set_fpscr ((cw))
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#else
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#define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (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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__END_DECLS
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#endif /* _FPU_CONTROL_H */
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