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Diffstat (limited to 'libm/ia64/fenv.h')
| -rw-r--r-- | libm/ia64/fenv.h | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/libm/ia64/fenv.h b/libm/ia64/fenv.h new file mode 100644 index 0000000..8c6b65b --- /dev/null +++ b/libm/ia64/fenv.h @@ -0,0 +1,242 @@ +/*- + * 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/ia64/fenv.h,v 1.4 2005/03/16 19:03:45 das Exp $ + */ + +#ifndef _FENV_H_ +#define _FENV_H_ + +#include <sys/_types.h> + +typedef __uint64_t fenv_t; +typedef __uint16_t fexcept_t; + +/* Exception flags */ +#define FE_INVALID 0x01 +#define FE_DENORMAL 0x02 +#define FE_DIVBYZERO 0x04 +#define FE_OVERFLOW 0x08 +#define FE_UNDERFLOW 0x10 +#define FE_INEXACT 0x20 +#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \ + FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) + +/* Rounding modes */ +#define FE_TONEAREST 0x0000 +#define FE_DOWNWARD 0x0400 +#define FE_UPWARD 0x0800 +#define FE_TOWARDZERO 0x0c00 +#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) + +#define _FPUSW_SHIFT 13 + +#define __stfpsr(__r) __asm __volatile("mov %0=ar.fpsr" : "=r" (*(__r))) +#define __ldfpsr(__r) __asm __volatile("mov ar.fpsr=%0;;" : : "r" (__r)) + +static __inline int +feclearexcept(int __excepts) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + __fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT); + __ldfpsr(__fpsr); + return (0); +} + +static __inline int +fegetexceptflag(fexcept_t *__flagp, int __excepts) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + *__flagp = (fexcept_t)(__fpsr >> _FPUSW_SHIFT) & __excepts; + return (0); +} + +static __inline int +fesetexceptflag(const fexcept_t *__flagp, int __excepts) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + __fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT); + __fpsr |= (fenv_t)(__excepts & *__flagp) << _FPUSW_SHIFT; + __ldfpsr(__fpsr); + return (0); +} + +/* + * It is worthwhile to use the inline version of this function iff it + * is called with arguments that are compile-time constants (due to + * dead code elimination). Unfortunately, gcc isn't smart enough to + * figure this out automatically, and there's no way to tell it. + * We assume that constant arguments will be the common case. + */ +static __inline int +feraiseexcept(int __excepts) +{ + volatile double d; + + /* + * With a compiler that supports the FENV_ACCESS pragma + * properly, simple expressions like '0.0 / 0.0' should + * be sufficient to generate traps. Unfortunately, we + * need to bring a volatile variable into the equation + * to prevent incorrect optimizations. + */ + if (__excepts & FE_INVALID) { + d = 0.0; + d = 0.0 / d; + } + if (__excepts & FE_DIVBYZERO) { + d = 0.0; + d = 1.0 / d; + } + if (__excepts & FE_OVERFLOW) { + d = 0x1.ffp1023; + d *= 2.0; + } + if (__excepts & FE_UNDERFLOW) { + d = 0x1p-1022; + d /= 0x1p1023; + } + if (__excepts & FE_INEXACT) { + d = 0x1p-1022; + d += 1.0; + } + return (0); +} + +static __inline int +fetestexcept(int __excepts) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + return ((__fpsr >> _FPUSW_SHIFT) & __excepts); +} + + +static __inline int +fegetround(void) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + return (__fpsr & _ROUND_MASK); +} + +static __inline int +fesetround(int __round) +{ + fenv_t __fpsr; + + if (__round & ~_ROUND_MASK) + return (-1); + __stfpsr(&__fpsr); + __fpsr &= ~_ROUND_MASK; + __fpsr |= __round; + __ldfpsr(__fpsr); + return (0); +} + +static __inline int +fegetenv(fenv_t *__envp) +{ + + __stfpsr(__envp); + return (0); +} + +static __inline int +feholdexcept(fenv_t *__envp) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + *__envp = __fpsr; + __fpsr &= ~((fenv_t)FE_ALL_EXCEPT << _FPUSW_SHIFT); + __fpsr |= FE_ALL_EXCEPT; + __ldfpsr(__fpsr); + return (0); +} + +static __inline int +fesetenv(const fenv_t *__envp) +{ + + __ldfpsr(*__envp); + return (0); +} + +int feupdateenv(const fenv_t *__envp); + +#if __BSD_VISIBLE + +static __inline int +feenableexcept(int __mask) +{ + fenv_t __newfpsr, __oldfpsr; + + __stfpsr(&__oldfpsr); + __newfpsr = __oldfpsr & ~(__mask & FE_ALL_EXCEPT); + __ldfpsr(__newfpsr); + return (~__oldfpsr & FE_ALL_EXCEPT); +} + +static __inline int +fedisableexcept(int __mask) +{ + fenv_t __newfpsr, __oldfpsr; + + __stfpsr(&__oldfpsr); + __newfpsr = __oldfpsr | (__mask & FE_ALL_EXCEPT); + __ldfpsr(__newfpsr); + return (~__oldfpsr & FE_ALL_EXCEPT); +} + +static __inline int +fegetexcept(void) +{ + fenv_t __fpsr; + + __stfpsr(&__fpsr); + return (~__fpsr & FE_ALL_EXCEPT); +} + +#endif /* __BSD_VISIBLE */ + +__END_DECLS + +#endif /* !_FENV_H_ */ |