diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/add_ui.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/add_ui.c | 70 |
1 files changed, 46 insertions, 24 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/add_ui.c b/Build/source/libs/mpfr/mpfr-src/src/add_ui.c index ef3b5ec923f..e6ad5db7831 100644 --- a/Build/source/libs/mpfr/mpfr-src/src/add_ui.c +++ b/Build/source/libs/mpfr/mpfr-src/src/add_ui.c @@ -23,7 +23,7 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., #define MPFR_NEED_LONGLONG_H #include "mpfr-impl.h" -int +MPFR_HOT_FUNCTION_ATTR int mpfr_add_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mpfr_rnd_t rnd_mode) { MPFR_LOG_FUNC @@ -31,29 +31,51 @@ mpfr_add_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mpfr_rnd_t rnd_mode mpfr_get_prec(x), mpfr_log_prec, x, u, rnd_mode), ("y[%Pu]=%.*Rg", mpfr_get_prec (y), mpfr_log_prec, y)); - if (MPFR_LIKELY(u != 0) ) /* if u=0, do nothing */ + /* (unsigned long) 0 is assumed to be a real 0 (unsigned) */ + if (MPFR_UNLIKELY (u == 0)) + return mpfr_set (y, x, rnd_mode); + + /* This block is actually useless, but this is a minor optimization. */ + if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x))) { - mpfr_t uu; - mp_limb_t up[1]; - unsigned long cnt; - int inex; - MPFR_SAVE_EXPO_DECL (expo); - - MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS); - MPFR_ASSERTD (u == (mp_limb_t) u); - count_leading_zeros(cnt, (mp_limb_t) u); - up[0] = (mp_limb_t) u << cnt; - - /* Optimization note: Exponent save/restore operations may be - removed if mpfr_add works even when uu is out-of-range. */ - MPFR_SAVE_EXPO_MARK (expo); - MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt); - inex = mpfr_add(y, x, uu, rnd_mode); - MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags); - MPFR_SAVE_EXPO_FREE (expo); - return mpfr_check_range(y, inex, rnd_mode); + if (MPFR_IS_NAN (x)) + { + MPFR_SET_NAN (y); + MPFR_RET_NAN; + } + if (MPFR_IS_INF (x)) + { + MPFR_SET_INF (y); + MPFR_SET_SAME_SIGN (y, x); + MPFR_RET (0); /* +/-infinity is exact */ + } + MPFR_ASSERTD (MPFR_IS_ZERO (x) && u != 0); + /* Note: the fact that u != 0 is important due to signed zeros. */ + return mpfr_set_ui (y, u, rnd_mode); } - else - /* (unsigned long) 0 is assumed to be a real 0 (unsigned) */ - return mpfr_set (y, x, rnd_mode); + + /* Main code */ + { + mpfr_t uu; + mp_limb_t up[1]; + int cnt; + int inex; + MPFR_SAVE_EXPO_DECL (expo); + + MPFR_TMP_INIT1 (up, uu, GMP_NUMB_BITS); + MPFR_STAT_STATIC_ASSERT (MPFR_LIMB_MAX >= ULONG_MAX); + /* So, u fits in a mp_limb_t, which justifies the casts below. */ + MPFR_ASSERTD (u != 0); + count_leading_zeros (cnt, (mp_limb_t) u); + up[0] = (mp_limb_t) u << cnt; + + /* Optimization note: Exponent save/restore operations may be + removed if mpfr_add works even when uu is out-of-range. */ + MPFR_SAVE_EXPO_MARK (expo); + MPFR_SET_EXP (uu, GMP_NUMB_BITS - cnt); + inex = mpfr_add (y, x, uu, rnd_mode); + MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags); + MPFR_SAVE_EXPO_FREE (expo); + return mpfr_check_range (y, inex, rnd_mode); + } } |