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Diffstat (limited to 'sysdeps/powerpc/fpu')
| -rw-r--r-- | sysdeps/powerpc/fpu/bits/fenv.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/sysdeps/powerpc/fpu/bits/fenv.h b/sysdeps/powerpc/fpu/bits/fenv.h new file mode 100644 index 0000000000..f86d02d014 --- /dev/null +++ b/sysdeps/powerpc/fpu/bits/fenv.h @@ -0,0 +1,178 @@ +/* Copyright (C) 1997, 1998 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _FENV_H +# error "Never use <bits/fenv.h> directly; include <fenv.h> instead." +#endif + + +/* Define bits representing the exception. We use the bit positions of + the appropriate bits in the FPSCR... */ +enum + { + FE_INEXACT = 1 << (31 - 6), +#define FE_INEXACT FE_INEXACT + FE_DIVBYZERO = 1 << (31 - 5), +#define FE_DIVBYZERO FE_DIVBYZERO + FE_UNDERFLOW = 1 << (31 - 4), +#define FE_UNDERFLOW FE_UNDERFLOW + FE_OVERFLOW = 1 << (31 - 3), +#define FE_OVERFLOW FE_OVERFLOW + + /* ... except for FE_INVALID, for which we use bit 31. FE_INVALID + actually corresponds to bits 7 through 12 and 21 through 23 + in the FPSCR, but we can't use that because the current draft + says that it must be a power of 2. Instead we use bit 2 which + is the summary bit for all the FE_INVALID exceptions, which + kind of makes sense. */ + FE_INVALID = 1 << (31 - 2), +#define FE_INVALID FE_INVALID + +#ifdef __USE_GNU + /* Breakdown of the FE_INVALID bits. Setting FE_INVALID on an + input to a routine is equivalent to setting all of these bits; + FE_INVALID will be set on output from a routine iff one of + these bits is set. Note, though, that you can't disable or + enable these exceptions individually. */ + + /* Operation with SNaN. */ + FE_INVALID_SNAN = 1 << (31 - 7), +# define FE_INVALID_SNAN FE_INVALID_SNAN + + /* Inf - Inf */ + FE_INVALID_ISI = 1 << (31 - 8), +# define FE_INVALID_ISI FE_INVALID_ISI + + /* Inf / Inf */ + FE_INVALID_IDI = 1 << (31 - 9), +# define FE_INVALID_IDI FE_INVALID_IDI + + /* 0 / 0 */ + FE_INVALID_ZDZ = 1 << (31 - 10), +# define FE_INVALID_ZDZ FE_INVALID_ZDZ + + /* Inf * 0 */ + FE_INVALID_IMZ = 1 << (31 - 11), +# define FE_INVALID_IMZ FE_INVALID_IMZ + + /* Comparison with NaN or SNaN. */ + FE_INVALID_COMPARE = 1 << (31 - 12), +# define FE_INVALID_COMPARE FE_INVALID_COMPARE + + /* Invalid operation flag for software (not set by hardware). */ + /* Note that some chips don't have this implemented, presumably + because no-one expected anyone to write software for them %-). */ + FE_INVALID_SOFTWARE = 1 << (31 - 21), +# define FE_INVALID_SOFTWARE FE_INVALID_SOFTWARE + + /* Square root of negative number (including -Inf). */ + /* Note that some chips don't have this implemented. */ + FE_INVALID_SQRT = 1 << (31 - 22), +# define FE_INVALID_SQRT FE_INVALID_SQRT + + /* Conversion-to-integer of a NaN or a number too large or too small. */ + FE_INVALID_INTEGER_CONVERSION = 1 << (31 - 23), +# define FE_INVALID_INTEGER_CONVERSION FE_INVALID_INTEGER_CONVERSION + +# define FE_ALL_INVALID \ + (FE_INVALID_SNAN | FE_INVALID_ISI | FE_INVALID_IDI | FE_INVALID_ZDZ \ + | FE_INVALID_IMZ | FE_INVALID_COMPARE | FE_INVALID_SOFTWARE \ + | FE_INVALID_SQRT | FE_INVALID_INTEGER_CONVERSION) +#endif + }; + +#define FE_ALL_EXCEPT \ + (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) + +/* PowerPC chips support all of the four defined rounding modes. We + use the bit pattern in the FPSCR as the values for the + appropriate macros. */ +enum + { + FE_TONEAREST = 0, +#define FE_TONEAREST FE_TONEAREST + FE_TOWARDZERO = 1, +#define FE_TOWARDZERO FE_TOWARDZERO + FE_UPWARD = 2, +#define FE_UPWARD FE_UPWARD + FE_DOWNWARD = 3, +#define FE_DOWNWARD FE_DOWNWARD + }; + +/* Type representing exception flags. */ +typedef unsigned int fexcept_t; + +/* Type representing floating-point environment. We leave it as 'double' + for efficiency reasons (rather than writing it to a 32-bit integer). */ +typedef double fenv_t; + +/* If the default argument is used we use this value. */ +extern const fenv_t __fe_dfl_env; +#define FE_DFL_ENV (&__fe_dfl_env) + +#ifdef __USE_GNU +/* Floating-point environment where all exceptions are enabled. Note that + this is not sufficient to give you SIGFPE. */ +extern const fenv_t __fe_enabled_env; +# define FE_ENABLED_ENV (&__fe_enabled_env) + +/* Floating-point environment with (processor-dependent) non-IEEE floating + point. */ +extern const fenv_t __fe_nonieee_env; +# define FE_NONIEEE_ENV (&__fe_nonieee_env) + +/* Floating-point environment with all exceptions enabled. Note that + just evaluating this value will set the processor into 'FPU + exceptions imprecise recoverable' mode, which may cause a significant + performance penalty (but have no other visible effect). */ +extern const fenv_t *__fe_nomask_env __P ((void)); +# define FE_NOMASK_ENV (__fe_nomask_env ()) +#endif + +#if defined __OPTIMIZE__ && !defined _SOFT_FLOAT +/* Inline definition for fegetround. */ +# define fegetround() \ + (__extension__ ({ int __fegetround_result; \ + __asm__ ("mcrfs 7,7 ; mfcr %0" \ + : "=r"(__fegetround_result) : : "cr7"); \ + __fegetround_result & 3; })) + +/* Inline definition for feraiseexcept. */ +# define feraiseexcept(__excepts) \ + (__extension__ ({ if (__builtin_constant_p (__excepts) \ + && ((__excepts) & -(__excepts)) == 0 \ + && (__excepts) != FE_INVALID) { \ + if ((__excepts) != 0) \ + __asm__ __volatile__ \ + ("mtfsb1 %0" \ + : : "i"(32 - __builtin_ffs (__excepts))); \ + } else \ + (feraiseexcept) (__excepts); })) + +/* Inline definition for feclearexcept. */ +# define feclearexcept(__excepts) \ + (__extension__ ({ if (__builtin_constant_p (__excepts) \ + && ((__excepts) & -(__excepts)) == 0 \ + && (__excepts) != FE_INVALID) { \ + if ((__excepts) != 0) \ + __asm__ __volatile__ \ + ("mtfsb0 %0" \ + : : "i"(32 - __builtin_ffs (__excepts))); \ + } else \ + (feclearexcept) (__excepts); })) +#endif /* __OPTIMIZE__ && !_SOFT_FLOAT */ |