diff options
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/math_private.h | 55 |
1 files changed, 41 insertions, 14 deletions
diff --git a/sysdeps/generic/math_private.h b/sysdeps/generic/math_private.h index e98360dd47..c0fc03d38d 100644 --- a/sysdeps/generic/math_private.h +++ b/sysdeps/generic/math_private.h @@ -553,35 +553,62 @@ default_libc_feupdateenv_test (fenv_t *e, int ex) # define libc_feresetround_noexl libc_fesetenvl #endif +#if HAVE_RM_CTX +/* Set/Restore Rounding Modes only when necessary. If defined, these functions + set/restore floating point state only if the state needed within the lexical + block is different from the current state. This saves a lot of time when + the floating point unit is much slower than the fixed point units. */ + +# ifndef libc_feresetround_noex_ctx +# define libc_feresetround_noex_ctx libc_fesetenv_ctx +# endif +# ifndef libc_feresetround_noexf_ctx +# define libc_feresetround_noexf_ctx libc_fesetenvf_ctx +# endif +# ifndef libc_feresetround_noexl_ctx +# define libc_feresetround_noexl_ctx libc_fesetenvl_ctx +# endif + +# ifndef libc_feholdsetround_53bit_ctx +# define libc_feholdsetround_53bit_ctx libc_feholdsetround_ctx +# endif + +# ifndef libc_feresetround_53bit_ctx +# define libc_feresetround_53bit_ctx libc_feresetround_ctx +# endif + +# define SET_RESTORE_ROUND_GENERIC(RM,ROUNDFUNC,CLEANUPFUNC) \ + struct rm_ctx ctx __attribute__((cleanup(CLEANUPFUNC ## _ctx))); \ + ROUNDFUNC ## _ctx (&ctx, (RM)) +#else +# define SET_RESTORE_ROUND_GENERIC(RM, ROUNDFUNC, CLEANUPFUNC) \ + fenv_t __libc_save_rm __attribute__((cleanup(CLEANUPFUNC))); \ + ROUNDFUNC (&__libc_save_rm, (RM)) +#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)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround, libc_feresetround) #define SET_RESTORE_ROUNDF(RM) \ - fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundf))); \ - libc_feholdsetroundf (&__libc_save_rm, (RM)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundf, libc_feresetroundf) #define SET_RESTORE_ROUNDL(RM) \ - fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetroundl))); \ - libc_feholdsetroundl (&__libc_save_rm, (RM)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundl, libc_feresetroundl) /* 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)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround, libc_feresetround_noex) #define SET_RESTORE_ROUND_NOEXF(RM) \ - fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexf))); \ - libc_feholdsetroundf (&__libc_save_rm, (RM)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundf, libc_feresetround_noexf) #define SET_RESTORE_ROUND_NOEXL(RM) \ - fenv_t __libc_save_rm __attribute__((cleanup(libc_feresetround_noexl))); \ - libc_feholdsetroundl (&__libc_save_rm, (RM)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetroundl, libc_feresetround_noexl) /* 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_feresetround_53bit))); \ - libc_feholdsetround_53bit (&__libc_save_rm, (RM)) + SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround_53bit, \ + libc_feresetround_53bit) #define __nan(str) \ (__builtin_constant_p (str) && str[0] == '\0' ? NAN : __nan (str)) |