diff options
| author | Martynas Venckus <martynas@cvs.openbsd.org> | 2011-04-28 17:34:24 +0000 |
|---|---|---|
| committer | Martynas Venckus <martynas@cvs.openbsd.org> | 2011-04-28 17:34:24 +0000 |
| commit | f70eacf51aa926a56332357f2fd9556df8f52acb (patch) | |
| tree | 8f92efc601af164ae9d2320e5eeae77bc248a633 /sys/arch/m68k/include | |
| parent | 8fbde66430aa8b0773d3387e5e56968cd07a3156 (diff) | |
fenv improvements and cleanups
Diffstat (limited to 'sys/arch/m68k/include')
| -rw-r--r-- | sys/arch/m68k/include/fenv.h | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/sys/arch/m68k/include/fenv.h b/sys/arch/m68k/include/fenv.h index abf3de866e0..c7a0acf9e72 100644 --- a/sys/arch/m68k/include/fenv.h +++ b/sys/arch/m68k/include/fenv.h @@ -1,4 +1,4 @@ -/* $OpenBSD: fenv.h,v 1.1 2011/04/20 22:27:59 martynas Exp $ */ +/* $OpenBSD: fenv.h,v 1.2 2011/04/28 17:34:23 martynas Exp $ */ /* * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org> @@ -36,8 +36,9 @@ * The following symbol is simply the bitwise-inclusive OR of all floating-point * exception constants defined above. */ -#define FE_ALL_EXCEPT \ - (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) +#define FE_ALL_EXCEPT (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | \ + FE_OVERFLOW | FE_INVALID) +#define _MASK_SHIFT 6 /* * Each symbol representing the rounding direction, expands to an integer @@ -51,22 +52,31 @@ #define FE_UPWARD 0x30 /* - * FPCR encodes rounding modes by bits 4-5. - * FPCR and FPSR exception mask shifts by 6. + * The following symbol is simply the bitwise-inclusive OR of all floating-point + * rounding direction constants defined above. */ -#define _ROUND_MASK 0x30 -#define _EMASK_SHIFT 6 +#define _ROUND_MASK (FE_TONEAREST | FE_TOWARDZERO | FE_DOWNWARD | \ + FE_UPWARD) /* - * fenv_t represents the entire floating-point environment + * fenv_t represents the entire floating-point environment. */ -typedef struct { - unsigned int __control; /* Control register */ - unsigned int __status; /* Status register */ +typedef struct { + unsigned int __control; /* Control register */ + unsigned int __status; /* Status register */ } fenv_t; -extern fenv_t __fe_dfl_env; -#define FE_DFL_ENV ((const fenv_t *) &__fe_dfl_env) +/* + * The following constant represents the default floating-point environment + * (that is, the one installed at program startup) and has type pointer to + * const-qualified fenv_t. + * + * It can be used as an argument to the functions within the <fenv.h> header + * that manage the floating-point environment, namely fesetenv() and + * feupdateenv(). + */ +extern fenv_t __fe_dfl_env; +#define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env) /* * fexcept_t represents the floating-point status flags collectively, including @@ -80,6 +90,6 @@ extern fenv_t __fe_dfl_env; * A floating-point control mode is a system variable whose value may be set by * the user to affect the subsequent behavior of floating-point arithmetic. */ -typedef unsigned int fexcept_t; +typedef unsigned int fexcept_t; -#endif /* ! _M68K_FENV_H_ */ +#endif /* !_M68K_FENV_H_ */ |