diff options
Diffstat (limited to 'ports/sysdeps/alpha/fpu/bits')
| -rw-r--r-- | ports/sysdeps/alpha/fpu/bits/fenv.h | 122 | ||||
| -rw-r--r-- | ports/sysdeps/alpha/fpu/bits/mathinline.h | 149 |
2 files changed, 271 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/fpu/bits/fenv.h b/ports/sysdeps/alpha/fpu/bits/fenv.h new file mode 100644 index 0000000000..2ddbaa15f8 --- /dev/null +++ b/ports/sysdeps/alpha/fpu/bits/fenv.h @@ -0,0 +1,122 @@ +/* Copyright (C) 1997-2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _FENV_H +# error "Never use <bits/fenv.h> directly; include <fenv.h> instead." +#endif + + +/* Define the bits representing the exception. + + Note that these are the bit positions as defined by the OSF/1 + ieee_{get,set}_control_word interface and not by the hardware fpcr. + + See the Alpha Architecture Handbook section 4.7.7.3 for details, + but in summary, trap shadows mean the hardware register can acquire + extra exception bits so for proper IEEE support the tracking has to + be done in software -- in this case with kernel support. + + As to why the system call interface isn't in the same format as + the hardware register, only those crazy folks at DEC can tell you. */ + +enum + { +#ifdef __USE_GNU + FE_DENORMAL = 1UL << 22, +#define FE_DENORMAL FE_DENORMAL +#endif + + FE_INEXACT = 1UL << 21, +#define FE_INEXACT FE_INEXACT + + FE_UNDERFLOW = 1UL << 20, +#define FE_UNDERFLOW FE_UNDERFLOW + + FE_OVERFLOW = 1UL << 19, +#define FE_OVERFLOW FE_OVERFLOW + + FE_DIVBYZERO = 1UL << 18, +#define FE_DIVBYZERO FE_DIVBYZERO + + FE_INVALID = 1UL << 17, +#define FE_INVALID FE_INVALID + + FE_ALL_EXCEPT = 0x3f << 17 +#define FE_ALL_EXCEPT FE_ALL_EXCEPT + }; + +/* Alpha chips support all four defined rouding modes. + + Note that code must be compiled to use dynamic rounding (/d) instructions + to see these changes. For gcc this is -mfp-rounding-mode=d; for DEC cc + this is -fprm d. The default for both is static rounding to nearest. + + These are shifted down 58 bits from the hardware fpcr because the + functions are declared to take integers. */ + +enum + { + FE_TOWARDZERO = 0, +#define FE_TOWARDZERO FE_TOWARDZERO + + FE_DOWNWARD = 1, +#define FE_DOWNWARD FE_DOWNWARD + + FE_TONEAREST = 2, +#define FE_TONEAREST FE_TONEAREST + + FE_UPWARD = 3, +#define FE_UPWARD FE_UPWARD + }; + +#ifdef __USE_GNU +/* On later hardware, and later kernels for earlier hardware, we can forcibly + underflow denormal inputs and outputs. This can speed up certain programs + significantly, usually without affecting accuracy. */ +enum + { + FE_MAP_DMZ = 1UL << 12, /* Map denorm inputs to zero */ +#define FE_MAP_DMZ FE_MAP_DMZ + + FE_MAP_UMZ = 1UL << 13, /* Map underflowed outputs to zero */ +#define FE_MAP_UMZ FE_MAP_UMZ + }; +#endif + +/* Type representing exception flags. */ +typedef unsigned long int fexcept_t; + +/* Type representing floating-point environment. */ +typedef unsigned long int fenv_t; + +/* If the default argument is used we use this value. Note that due to + architecture-specified page mappings, no user-space pointer will ever + have its two high bits set. Co-opt one. */ +#define FE_DFL_ENV ((const fenv_t *) 0x8800000000000000UL) + +#ifdef __USE_GNU +/* Floating-point environment where none of the exceptions are masked. */ +# define FE_NOMASK_ENV ((const fenv_t *) 0x880000000000003eUL) + +/* Floating-point environment with (processor-dependent) non-IEEE floating + point. In this case, mapping denormals to zero. */ +# define FE_NONIEEE_ENV ((const fenv_t *) 0x8800000000003000UL) +#endif + +/* The system calls to talk to the kernel's FP code. */ +extern unsigned long int __ieee_get_fp_control (void) __THROW; +extern void __ieee_set_fp_control (unsigned long int __value) __THROW; diff --git a/ports/sysdeps/alpha/fpu/bits/mathinline.h b/ports/sysdeps/alpha/fpu/bits/mathinline.h new file mode 100644 index 0000000000..1d15c28191 --- /dev/null +++ b/ports/sysdeps/alpha/fpu/bits/mathinline.h @@ -0,0 +1,149 @@ +/* Inline math functions for Alpha. + Copyright (C) 1996, 1997, 1999-2001, 2004, 2007 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by David Mosberger-Tang. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _MATH_H +# error "Never use <bits/mathinline.h> directly; include <math.h> instead." +#endif + +#ifndef __extern_inline +# define __MATH_INLINE __inline +#else +# define __MATH_INLINE __extern_inline +#endif + +#if defined __USE_ISOC99 && defined __GNUC__ && !__GNUC_PREREQ(3,0) +# undef isgreater +# undef isgreaterequal +# undef isless +# undef islessequal +# undef islessgreater +# undef isunordered +# define isunordered(u, v) \ + (__extension__ \ + ({ double __r, __u = (u), __v = (v); \ + __asm ("cmptun/su %1,%2,%0\n\ttrapb" \ + : "=&f" (__r) : "f" (__u), "f"(__v)); \ + __r != 0; })) +#endif /* ISO C99 */ + +#if (!defined __NO_MATH_INLINES || defined __LIBC_INTERNAL_MATH_INLINES) \ + && defined __OPTIMIZE__ + +#if !__GNUC_PREREQ (4, 0) +# define __inline_copysign(NAME, TYPE) \ +__MATH_INLINE TYPE \ +__NTH (NAME (TYPE __x, TYPE __y)) \ +{ \ + TYPE __z; \ + __asm ("cpys %1, %2, %0" : "=f" (__z) : "f" (__y), "f" (__x)); \ + return __z; \ +} + +__inline_copysign (__copysignf, float) +__inline_copysign (copysignf, float) +__inline_copysign (__copysign, double) +__inline_copysign (copysign, double) + +# undef __inline_copysign +#endif + + +#if !__GNUC_PREREQ (2, 8) +# define __inline_fabs(NAME, TYPE) \ +__MATH_INLINE TYPE \ +__NTH (NAME (TYPE __x)) \ +{ \ + TYPE __z; \ + __asm ("cpys $f31, %1, %0" : "=f" (__z) : "f" (__x)); \ + return __z; \ +} + +__inline_fabs (__fabsf, float) +__inline_fabs (fabsf, float) +__inline_fabs (__fabs, double) +__inline_fabs (fabs, double) + +# undef __inline_fabs +#endif + +#ifdef __USE_ISOC99 + +/* Test for negative number. Used in the signbit() macro. */ +__MATH_INLINE int +__NTH (__signbitf (float __x)) +{ +#if !__GNUC_PREREQ (4, 0) + __extension__ union { float __f; int __i; } __u = { __f: __x }; + return __u.__i < 0; +#else + return __builtin_signbitf (__x); +#endif +} + +__MATH_INLINE int +__NTH (__signbit (double __x)) +{ +#if !__GNUC_PREREQ (4, 0) + __extension__ union { double __d; long __i; } __u = { __d: __x }; + return __u.__i < 0; +#else + return __builtin_signbit (__x); +#endif +} + +__MATH_INLINE int +__NTH (__signbitl (long double __x)) +{ +#if !__GNUC_PREREQ (4, 0) + __extension__ union { + long double __d; + long __i[sizeof(long double)/sizeof(long)]; + } __u = { __d: __x }; + return __u.__i[sizeof(long double)/sizeof(long) - 1] < 0; +#else + return __builtin_signbitl (__x); +#endif +} + +/* Test for NaN. Used in the isnan() macro. */ + +__MATH_INLINE int +__NTH (__isnanf (float __x)) +{ + return isunordered (__x, __x); +} + +__MATH_INLINE int +__NTH (__isnan (double __x)) +{ + return isunordered (__x, __x); +} + +#ifndef __NO_LONG_DOUBLE_MATH +__MATH_INLINE int +__NTH (__isnanl (long double __x)) +{ + return isunordered (__x, __x); +} +#endif + +#endif /* C99 */ + +#endif /* __NO_MATH_INLINES */ |