diff options
Diffstat (limited to 'tanh.c')
| -rw-r--r-- | tanh.c | 53 |
1 files changed, 23 insertions, 30 deletions
@@ -30,14 +30,7 @@ MA 02111-1307, USA. */ */ int -#if __STDC__ mpfr_tanh (mpfr_ptr y, mpfr_srcptr xt , mp_rnd_t rnd_mode) -#else -mpfr_tanh (y, xt, rnd_mode) - mpfr_ptr y; - mpfr_srcptr xt; - mp_rnd_t rnd_mode; -#endif { /****** Declaration ******/ @@ -46,35 +39,35 @@ mpfr_tanh (y, xt, rnd_mode) int flag_neg=0, inexact=0; /* Special value checking */ - - if (MPFR_IS_NAN(xt)) + if (MPFR_UNLIKELY(MPFR_IS_SINGULAR(xt))) { - MPFR_SET_NAN(y); - MPFR_RET_NAN; - } - MPFR_CLEAR_NAN(y); - - if (MPFR_IS_INF(xt)) - { - if (MPFR_SIGN(xt) > 0) - return mpfr_set_si(y,1,rnd_mode); /* tanh(inf) = 1 */ - else - return mpfr_set_si(y,-1,rnd_mode); /* tanh(-inf) = -1 */ - } - MPFR_CLEAR_INF(y); - - /* tanh(0) = 0 */ - if (MPFR_IS_ZERO(xt)) - { - MPFR_SET_ZERO(y); - MPFR_SET_SAME_SIGN(y,xt); - MPFR_RET(0); + if (MPFR_IS_NAN(xt)) + { + MPFR_SET_NAN(y); + MPFR_RET_NAN; + } + else if (MPFR_IS_INF(xt)) + { + if (MPFR_IS_POS(xt)) + return mpfr_set_si(y,1,rnd_mode); /* tanh(inf) = 1 */ + else + return mpfr_set_si(y,-1,rnd_mode); /* tanh(-inf) = -1 */ + } + /* tanh(0) = 0 */ + else if (MPFR_IS_ZERO(xt)) + { + MPFR_SET_ZERO(y); + MPFR_SET_SAME_SIGN(y,xt); + MPFR_RET(0); + } + /* Should never reach this point */ + MPFR_ASSERTN(1); } mpfr_init2(x,Nxt); mpfr_set(x,xt,GMP_RNDN); - if (MPFR_SIGN(x) < 0) + if (MPFR_IS_NEG(x)) { MPFR_CHANGE_SIGN(x); flag_neg=1; |