68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* FPU control word definitions. PowerPC version.
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Copyright (C) 1996, 1997, 1998 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 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
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/* rounding control */
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#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
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#define _FPU_RC_DOWN 0x03
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#define _FPU_RC_UP 0x02
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#define _FPU_RC_ZERO 0x01
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#define _FPU_MASK_NI 0x04 /* non-ieee mode */
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/* masking of interrupts */
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#define _FPU_MASK_ZM 0x10 /* zero divide */
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#define _FPU_MASK_OM 0x40 /* overflow */
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#define _FPU_MASK_UM 0x20 /* underflow */
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#define _FPU_MASK_XM 0x08 /* inexact */
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#define _FPU_MASK_IM 0x80 /* invalid operation */
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#define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */
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/* The fdlibm code requires no interrupts for exceptions. */
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#define _FPU_DEFAULT 0x00000000 /* Default value. */
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/* IEEE: same as above, but (some) exceptions;
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we leave the 'inexact' exception off.
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*/
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#define _FPU_IEEE 0x000000f0
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/* Type of the control word. */
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typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
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/* Macros for accessing the hardware control word. */
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#define _FPU_GETCW(cw) ( { \
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fpu_control_t tmp[2] __attribute__ ((__aligned__(8))); \
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__asm__ ("mffs 0; stfd 0,%0" : "=m" (*tmp) : : "fr0"); \
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(cw)=tmp[1]; \
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tmp[1]; } )
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#define _FPU_SETCW(cw) { \
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fpu_control_t tmp[2] __attribute__ ((__aligned__(8))); \
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tmp[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \
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tmp[1] = cw; \
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__asm__ ("lfd 0,%0; mtfsf 255,0" : : "m" (*tmp) : "fr0"); \
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}
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/* Default control word set at startup. */
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extern fpu_control_t __fpu_control;
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#endif /* _FPU_CONTROL_H */
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