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Create and use SET_RESTORE_ROUND{,_NOEX,_53BIT}{,F,L}.

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This commit is contained in:
Richard Henderson
2012-03-10 08:55:53 -08:00
parent 7d2e8012cf
commit eb92c487b3
10 changed files with 221 additions and 118 deletions
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69
sysdeps/generic/math_private.h
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@ -457,6 +457,75 @@ default_libc_feupdateenv (fenv_t *e)
# define libc_feupdateenv_53bit libc_feupdateenv
#endif
/* Save and set the rounding mode. The use of fenv_t to store the old mode
allows a target-specific version of this function to avoid converting the
rounding mode from the fpu format. By default we have no choice but to
manipulate the entire env. */
#ifndef libc_feholdsetround
# define libc_feholdsetround libc_feholdexcept_setround
#endif
#ifndef libc_feholdsetroundf
# define libc_feholdsetroundf libc_feholdexcept_setroundf
#endif
#ifndef libc_feholdsetroundl
# define libc_feholdsetroundl libc_feholdexcept_setroundl
#endif
/* ... and the reverse. */
#ifndef libc_feresetround
# define libc_feresetround libc_feupdateenv
#endif
#ifndef libc_feresetroundf
# define libc_feresetroundf libc_feupdateenvf
#endif
#ifndef libc_feresetroundl
# define libc_feresetroundl libc_feupdateenvl
#endif
/* ... and a version that may also discard exceptions. */
#ifndef libc_feresetround_noex
# define libc_feresetround_noex libc_fesetenv
#endif
#ifndef libc_feresetround_noexf
# define libc_feresetround_noexf libc_fesetenvf
#endif
#ifndef libc_feresetround_noexl
# define libc_feresetround_noexl libc_fesetenvl
#endif
/* Save and restore the rounding mode within a lexical block. */
#define SET_RESTORE_ROUND(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround))); \
libc_feholdsetround (&__libc_save_rm, (RM))
#define SET_RESTORE_ROUNDF(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundf))); \
libc_feholdsetroundf (&__libc_save_rm, (RM))
#define SET_RESTORE_ROUNDL(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundl))); \
libc_feholdsetroundl (&__libc_save_rm, (RM))
/* Save and restore the rounding mode within a lexical block, and also
the set of exceptions raised within the block may be discarded. */
#define SET_RESTORE_ROUND_NOEX(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noex))); \
libc_feholdsetround (&__libc_save_rm, (RM))
#define SET_RESTORE_ROUND_NOEXF(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexf))); \
libc_feholdsetroundf (&__libc_save_rm, (RM))
#define SET_RESTORE_ROUND_NOEXL(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexl))); \
libc_feholdsetroundl (&__libc_save_rm, (RM))
/* Like SET_RESTORE_ROUND, but also set rounding precision to 53 bits. */
#define SET_RESTORE_ROUND_53BIT(RM) \
fenv_t __libc_save_rm __attribute__((cleanup(libc_feupdateenv_53bit))); \
libc_feholdexcept_setround_53bit (&__libc_save_rm, (RM))
#define __nan(str) \
(__builtin_constant_p (str) && str[0] == '\0' ? NAN : __nan (str))
#define __nanf(str) \