diff options
Diffstat (limited to 'src/atan.c')
| -rw-r--r-- | src/atan.c | 36 |
1 files changed, 14 insertions, 22 deletions
@@ -26,14 +26,14 @@ MA 02111-1307, USA. */ +pi/2 else rounded in the direction rnd */ -static int +int set_pi_over_2 (mpfr_ptr rop, int s, mpfr_rnd_t rnd) { int inex; - inex = mpfr_const_pi (rop, s ? INV_RND (rnd) : rnd); + inex = mpfr_const_pi (rop, s < 0 ? INV_RND (rnd) : rnd); mpfr_div_2ui (rop, rop, 1, GMP_RNDN); - if (s) + if (s < 0) { inex = -inex; mpfr_neg (rop, rop, GMP_RNDN); @@ -47,16 +47,18 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) { int s_re; int s_im; + int inex_re; + int inex_im; + int inex; + inex_re = 0; + inex_im = 0; s_re = mpfr_signbit (MPC_RE (op)); s_im = mpfr_signbit (MPC_IM (op)); /* special values */ if (mpfr_nan_p (MPC_RE (op)) || mpfr_nan_p (MPC_IM (op))) { - int inex_re; - inex_re = 0; - if (mpfr_nan_p (MPC_RE (op))) { mpfr_set_nan (MPC_RE (rop)); @@ -73,7 +75,7 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) { if (mpfr_inf_p (MPC_RE (op))) { - inex_re = set_pi_over_2 (MPC_RE (rop), s_re, MPC_RND_RE (rnd)); + inex_re = set_pi_over_2 (MPC_RE (rop), -s_re, MPC_RND_RE (rnd)); mpfr_set_ui (MPC_IM (rop), 0, GMP_RNDN); } else @@ -87,8 +89,7 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) if (mpfr_inf_p (MPC_RE (op)) || mpfr_inf_p (MPC_IM (op))) { - int inex_re; - inex_re = set_pi_over_2 (MPC_RE (rop), s_re, MPC_RND_RE (rnd)); + inex_re = set_pi_over_2 (MPC_RE (rop), -s_re, MPC_RND_RE (rnd)); mpfr_set_ui (MPC_IM (rop), 0, GMP_RNDN); if (s_im) @@ -100,10 +101,8 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) /* pure real argument */ if (mpfr_zero_p (MPC_IM (op))) { - int inex_re; - inex_re = mpfr_atan (MPC_RE (rop), MPC_RE (op), MPC_RND_RE (rnd)); - + mpfr_set_ui (MPC_IM (rop), 0, GMP_RNDN); if (s_im) mpc_conj (rop, rop, GMP_RNDN); @@ -114,13 +113,8 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) /* pure imaginary argument */ if (mpfr_zero_p (MPC_RE (op))) { - int inex_re; - int inex_im; int cmp_1; - inex_re = 0; - inex_im = 0; - if (s_im) cmp_1 = -mpfr_cmp_si (MPC_IM (op), -1); else @@ -155,7 +149,7 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) rnd_im = MPC_RND_IM (rnd); mpfr_init (y); - p_im = mpfr_get_prec (MPC_IM (op)); + p_im = mpfr_get_prec (MPC_IM (rop)); p = p_im; /* a = o(1/y) with error(a) < 1 ulp(a) @@ -178,12 +172,12 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) /* atanh cannot underflow: |atanh(x)| > |x| for |x| < 1 */ inex_im |= mpfr_atanh (y, y, GMP_RNDZ); - ok = inex_im == 0 + ok = inex_im == 0 || mpfr_can_round (y, p-2, GMP_RNDZ, rnd_im, p_im + (rnd_im == GMP_RNDN)); } while (ok == 0); - inex_re = set_pi_over_2 (MPC_RE (rop), s_re, MPC_RND_RE (rnd)); + inex_re = set_pi_over_2 (MPC_RE (rop), -s_re, MPC_RND_RE (rnd)); inex_im = mpfr_set (MPC_IM (rop), y, rnd_im); mpfr_clear (y); } @@ -191,10 +185,8 @@ mpc_atan (mpc_ptr rop, mpc_srcptr op, mpc_rnd_t rnd) } /* regular number argument */ - /* TODO */ mpfr_set_nan (MPC_RE (rop)); mpfr_set_nan (MPC_IM (rop)); - return 0; } |