include/fenv.h

   1 #ifndef _FENV_H
   2 #include <math/fenv.h>
   3
   4 #ifndef _ISOMAC
   5 # include <stdbool.h>
   6 /* Now define the internal interfaces.  */
   7
   8 extern int __feclearexcept (int __excepts);
   9 extern int __fegetexcept (void);
  10 extern int __fegetexceptflag (fexcept_t *__flagp, int __excepts);
  11 extern int __feraiseexcept (int __excepts);
  12 extern int __fesetexceptflag (const fexcept_t *__flagp, int __excepts);
  13 extern int __fegetenv (fenv_t *__envp);
  14 extern int __fesetenv (const fenv_t *__envp);
  15 extern int __feupdateenv (const fenv_t *__envp);
  16 extern __typeof (fegetround) __fegetround __attribute_pure__;
  17 extern __typeof (feholdexcept) __feholdexcept;
  18 extern __typeof (fesetround) __fesetround;
  19
  20 libm_hidden_proto (feraiseexcept)
  21 libm_hidden_proto (__feraiseexcept)
  22 libm_hidden_proto (fegetenv)
  23 libm_hidden_proto (__fegetenv)
  24 libm_hidden_proto (fegetround)
  25 libm_hidden_proto (__fegetround)
  26 libm_hidden_proto (fesetenv)
  27 libm_hidden_proto (__fesetenv)
  28 libm_hidden_proto (fesetround)
  29 libm_hidden_proto (__fesetround)
  30 libm_hidden_proto (feholdexcept)
  31 libm_hidden_proto (__feholdexcept)
  32 libm_hidden_proto (feupdateenv)
  33 libm_hidden_proto (__feupdateenv)
  34 libm_hidden_proto (fetestexcept)
  35 libm_hidden_proto (feclearexcept)
  36
  37 /* Rounding mode context.  This allows functions to set/restore rounding mode
  38    only when the desired rounding mode is different from the current rounding
  39    mode.  */
  40 struct rm_ctx
  41 {
  42   fenv_t env;
  43   bool updated_status;
  44 };
  45
  46 /* Track whether rounding mode macros were defined, since
  47    get-rounding-mode.h may define default versions if they weren't.
  48    FE_TONEAREST must always be defined (even if no changes of rounding
  49    mode are supported, glibc requires it to be defined to represent
  50    the default rounding mode).  */
  51 # ifndef FE_TONEAREST
  52 #  error "FE_TONEAREST not defined"
  53 # endif
  54 # if defined FE_DOWNWARD || defined FE_TOWARDZERO || defined FE_UPWARD
  55 #  define FE_HAVE_ROUNDING_MODES 1
  56 # else
  57 #  define FE_HAVE_ROUNDING_MODES 0
  58 # endif
  59
  60 /* When no floating-point exceptions are defined in <fenv.h>, make
  61    feraiseexcept ignore its argument so that unconditional
  62    feraiseexcept calls do not cause errors for undefined exceptions.
  63    Define it to expand to a void expression so that any calls testing
  64    the result of feraiseexcept do produce errors.  */
  65 # if FE_ALL_EXCEPT == 0
  66 #  define feraiseexcept(excepts) ((void) 0)
  67 #  define __feraiseexcept(excepts) ((void) 0)
  68 # endif
  69
  70 /* Similarly, most <fenv.h> functions have trivial implementations in
  71    the absence of support for floating-point exceptions and rounding
  72    modes.  */
  73
  74 # if !FE_HAVE_ROUNDING_MODES
  75 #  if FE_ALL_EXCEPT == 0
  76 extern inline int
  77 fegetenv (fenv_t *__e)
  78 {
  79   return 0;
  80 }
  81
  82 extern inline int
  83 __fegetenv (fenv_t *__e)
  84 {
  85   return 0;
  86 }
  87
  88 extern inline int
  89 feholdexcept (fenv_t *__e)
  90 {
  91   return 0;
  92 }
  93
  94 extern inline int
  95 __feholdexcept (fenv_t *__e)
  96 {
  97   return 0;
  98 }
  99
 100 extern inline int
 101 fesetenv (const fenv_t *__e)
 102 {
 103   return 0;
 104 }
 105
 106 extern inline int
 107 __fesetenv (const fenv_t *__e)
 108 {
 109   return 0;
 110 }
 111
 112 extern inline int
 113 feupdateenv (const fenv_t *__e)
 114 {
 115   return 0;
 116 }
 117
 118 extern inline int
 119 __feupdateenv (const fenv_t *__e)
 120 {
 121   return 0;
 122 }
 123 #  endif
 124
 125 extern inline int
 126 fegetround (void)
 127 {
 128   return FE_TONEAREST;
 129 }
 130
 131 extern inline int
 132 __fegetround (void)
 133 {
 134   return FE_TONEAREST;
 135 }
 136
 137 extern inline int
 138 fesetround (int __d)
 139 {
 140   return 0;
 141 }
 142
 143 extern inline int
 144 __fesetround (int __d)
 145 {
 146   return 0;
 147 }
 148 # endif
 149
 150 #endif
 151
 152 #endif