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| author | Richard Henderson <rth@twiddle.net> | 2012-03-18 10:12:16 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2012-03-19 06:49:04 -0700 |
| commit | 7d2e8012cfb4fa30086ef330ef1b993cfcc3dd99 (patch) | |
| tree | cd4cb429c364286f515a65090132166fad505d14 | |
| parent | b4dabbb47a174e1075b5b93f29093319eab69f2c (diff) | |
| download | glibc-7d2e8012cfb4fa30086ef330ef1b993cfcc3dd99.zip glibc-7d2e8012cfb4fa30086ef330ef1b993cfcc3dd99.tar.gz glibc-7d2e8012cfb4fa30086ef330ef1b993cfcc3dd99.tar.bz2 | |
i386: Convert libc_{feholdexcept_setround,updateenv}_53bit to functions.
Also fix a bug in libc_feupdateenv_53bit: don't force the rounding
precision back to _FPU_EXTENDED, instead restore the precision that
the user had in effect beforehand.
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/math_private.h | 58 |
2 files changed, 33 insertions, 29 deletions
@@ -1,5 +1,9 @@ 2012-03-19 Richard Henderson <rth@twiddle.net> + * sysdeps/i386/fpu/math_private.h: Include <fenv.h>, <fpu_control.h>. + (libc_feholdexcept_setround_53bit): Convert from macro to function. + (libc_feupdateenv_53bit): Likewise. Don't force _FPU_EXTENDED. + * sysdeps/generic/math_private.h: Include <fenv.h>. (default_libc_feholdexcept): New. (default_libc_feholdexcept_setround): New. diff --git a/sysdeps/i386/fpu/math_private.h b/sysdeps/i386/fpu/math_private.h index 6520226..9236448 100644 --- a/sysdeps/i386/fpu/math_private.h +++ b/sysdeps/i386/fpu/math_private.h @@ -1,5 +1,8 @@ #ifndef _MATH_PRIVATE_H +#include <fenv.h> +#include <fpu_control.h> + #define math_opt_barrier(x) \ ({ __typeof (x) __x; \ __asm ("" : "=t" (__x) : "0" (x)); \ @@ -15,34 +18,31 @@ do \ } \ while (0) -#include_next <math_private.h> +static __always_inline void +libc_feholdexcept_setround_53bit (fenv_t *e, int r) +{ + feholdexcept (e); + fesetround (r); -#include <fpu_control.h> + fpu_control_t cw; + _FPU_GETCW (cw); + cw &= ~(fpu_control_t) _FPU_EXTENDED; + cw |= _FPU_DOUBLE; + _FPU_SETCW (cw); +} +#define libc_feholdexcept_setround_53bit libc_feholdexcept_setround_53bit + +static __always_inline void +libc_feupdateenv_53bit (fenv_t *e) +{ + feupdateenv (e); + + /* Unfortunately, feupdateenv fails to affect the rounding precision. + We can get that back by restoring the exact control word we saved. */ + _FPU_SETCW (e->__control_word); +} +#define libc_feupdateenv_53bit libc_feupdateenv_53bit + +#include_next <math_private.h> -#undef libc_feholdexcept_setround_53bit -#define libc_feholdexcept_setround_53bit(e, r) \ - do \ - { \ - fpu_control_t cw; \ - libc_feholdexcept_setround (e, r); \ - _FPU_GETCW (cw); \ - cw &= ~(fpu_control_t) _FPU_EXTENDED; \ - cw |= _FPU_DOUBLE; \ - _FPU_SETCW (cw); \ - } \ - while (0) - -#undef libc_feupdateenv_53bit -#define libc_feupdateenv_53bit(e) \ - do \ - { \ - fpu_control_t cw; \ - libc_feupdateenv (e); \ - _FPU_GETCW (cw); \ - cw &= ~(fpu_control_t) _FPU_EXTENDED; \ - cw |= _FPU_EXTENDED; \ - _FPU_SETCW (cw); \ - } \ - while (0) - -#endif +#endif /* _MATH_PRIVATE_H */ |