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Diffstat (limited to 'libm/powerpc/fenv.h')
| -rw-r--r-- | libm/powerpc/fenv.h | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/libm/powerpc/fenv.h b/libm/powerpc/fenv.h new file mode 100644 index 0000000..3fd2389 --- /dev/null +++ b/libm/powerpc/fenv.h @@ -0,0 +1,263 @@ +/*- + * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD: src/lib/msun/powerpc/fenv.h,v 1.3 2005/03/16 19:03:45 das Exp $ + */ + +#ifndef _FENV_H_ +#define _FENV_H_ + +#include <sys/_types.h> + +typedef __uint32_t fenv_t; +typedef __uint32_t fexcept_t; + +/* Exception flags */ +#define FE_INEXACT 0x02000000 +#define FE_DIVBYZERO 0x04000000 +#define FE_UNDERFLOW 0x08000000 +#define FE_OVERFLOW 0x10000000 +#define FE_INVALID 0x20000000 /* all types of invalid FP ops */ + +/* + * The PowerPC architecture has extra invalid flags that indicate the + * specific type of invalid operation occurred. These flags may be + * tested, set, and cleared---but not masked---separately. All of + * these bits are cleared when FE_INVALID is cleared, but only + * FE_VXSOFT is set when FE_INVALID is explicitly set in software. + */ +#define FE_VXCVI 0x00000100 /* invalid integer convert */ +#define FE_VXSQRT 0x00000200 /* square root of a negative */ +#define FE_VXSOFT 0x00000400 /* software-requested exception */ +#define FE_VXVC 0x00080000 /* ordered comparison involving NaN */ +#define FE_VXIMZ 0x00100000 /* inf * 0 */ +#define FE_VXZDZ 0x00200000 /* 0 / 0 */ +#define FE_VXIDI 0x00400000 /* inf / inf */ +#define FE_VXISI 0x00800000 /* inf - inf */ +#define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */ +#define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \ + FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \ + FE_VXSNAN | FE_INVALID) +#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ + FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) + +/* Rounding modes */ +#define FE_TONEAREST 0x0000 +#define FE_TOWARDZERO 0x0001 +#define FE_UPWARD 0x0002 +#define FE_DOWNWARD 0x0003 +#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ + FE_UPWARD | FE_TOWARDZERO) + +__BEGIN_DECLS + +/* Default floating-point environment */ +extern const fenv_t __fe_dfl_env; +#define FE_DFL_ENV (&__fe_dfl_env) + +/* We need to be able to map status flag positions to mask flag positions */ +#define _FPUSW_SHIFT 22 +#define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ + FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT) + +#define __mffs(__env) __asm __volatile("mffs %0" : "=f" (*(__env))) +#define __mtfsf(__env) __asm __volatile("mtfsf 255,%0" : : "f" (__env)) + +union __fpscr { + double __d; + struct { + __uint32_t __junk; + fenv_t __reg; + } __bits; +}; + +static __inline int +feclearexcept(int __excepts) +{ + union __fpscr __r; + + if (__excepts & FE_INVALID) + __excepts |= FE_ALL_INVALID; + __mffs(&__r.__d); + __r.__bits.__reg &= ~__excepts; + __mtfsf(__r.__d); + return (0); +} + +static __inline int +fegetexceptflag(fexcept_t *__flagp, int __excepts) +{ + union __fpscr __r; + + __mffs(&__r.__d); + *__flagp = __r.__bits.__reg & __excepts; + return (0); +} + +static __inline int +fesetexceptflag(const fexcept_t *__flagp, int __excepts) +{ + union __fpscr __r; + + if (__excepts & FE_INVALID) + __excepts |= FE_ALL_EXCEPT; + __mffs(&__r.__d); + __r.__bits.__reg &= ~__excepts; + __r.__bits.__reg |= *__flagp & __excepts; + __mtfsf(__r.__d); + return (0); +} + +static __inline int +feraiseexcept(int __excepts) +{ + union __fpscr __r; + + if (__excepts & FE_INVALID) + __excepts |= FE_VXSOFT; + __mffs(&__r.__d); + __r.__bits.__reg |= __excepts; + __mtfsf(__r.__d); + return (0); +} + +static __inline int +fetestexcept(int __excepts) +{ + union __fpscr __r; + + __mffs(&__r.__d); + return (__r.__bits.__reg & __excepts); +} + +static __inline int +fegetround(void) +{ + union __fpscr __r; + + __mffs(&__r.__d); + return (__r.__bits.__reg & _ROUND_MASK); +} + +static __inline int +fesetround(int __round) +{ + union __fpscr __r; + + if (__round & ~_ROUND_MASK) + return (-1); + __mffs(&__r.__d); + __r.__bits.__reg &= ~_ROUND_MASK; + __r.__bits.__reg |= __round; + __mtfsf(__r.__d); + return (0); +} + +static __inline int +fegetenv(fenv_t *__envp) +{ + union __fpscr __r; + + __mffs(&__r.__d); + *__envp = __r.__bits.__reg; + return (0); +} + +static __inline int +feholdexcept(fenv_t *__envp) +{ + union __fpscr __r; + + __mffs(&__r.__d); + *__envp = __r.__d; + __r.__bits.__reg &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); + __mtfsf(__r.__d); + return (0); +} + +static __inline int +fesetenv(const fenv_t *__envp) +{ + union __fpscr __r; + + __r.__bits.__reg = *__envp; + __mtfsf(__r.__d); + return (0); +} + +static __inline int +feupdateenv(const fenv_t *__envp) +{ + union __fpscr __r; + + __mffs(&__r.__d); + __r.__bits.__reg &= FE_ALL_EXCEPT; + __r.__bits.__reg |= *__envp; + __mtfsf(__r.__d); + return (0); +} + +#if __BSD_VISIBLE + +static __inline int +feenableexcept(int __mask) +{ + union __fpscr __r; + fenv_t __oldmask; + + __mffs(&__r.__d); + __oldmask = __r.__bits.__reg; + __r.__bits.__reg |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT; + __mtfsf(__r.__d); + return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); +} + +static __inline int +fedisableexcept(int __mask) +{ + union __fpscr __r; + fenv_t __oldmask; + + __mffs(&__r.__d); + __oldmask = __r.__bits.__reg; + __r.__bits.__reg &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT); + __mtfsf(__r.__d); + return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); +} + +static __inline int +fegetexcept(void) +{ + union __fpscr __r; + + __mffs(&__r.__d); + return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT); +} + +#endif /* __BSD_VISIBLE */ + +__END_DECLS + +#endif /* !_FENV_H_ */ |