Index: gcc/mpfr/acos.c |
diff --git a/gcc/mpfr/acos.c b/gcc/mpfr/acos.c |
deleted file mode 100644 |
index 69e560f7eafd62b73c546c71f4da5df7a75ed780..0000000000000000000000000000000000000000 |
--- a/gcc/mpfr/acos.c |
+++ /dev/null |
@@ -1,140 +0,0 @@ |
-/* mpfr_acos -- arc-cosinus of a floating-point number |
- |
-Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
-Contributed by the Arenaire and Cacao projects, INRIA. |
- |
-This file is part of the GNU MPFR Library, and was contributed by Mathieu Dutour. |
- |
-The GNU MPFR Library is free software; you can redistribute it and/or modify |
-it under the terms of the GNU Lesser General Public License as published by |
-the Free Software Foundation; either version 2.1 of the License, or (at your |
-option) any later version. |
- |
-The GNU MPFR Library is distributed in the hope that it will be useful, but |
-WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
-or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
-License for more details. |
- |
-You should have received a copy of the GNU Lesser General Public License |
-along with the GNU MPFR Library; see the file COPYING.LIB. If not, write to |
-the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
-MA 02110-1301, USA. */ |
- |
-#include "mpfr-impl.h" |
- |
-int |
-mpfr_acos (mpfr_ptr acos, mpfr_srcptr x, mp_rnd_t rnd_mode) |
-{ |
- mpfr_t xp, arcc, tmp; |
- mp_exp_t supplement; |
- mp_prec_t prec; |
- int sign, compared, inexact; |
- MPFR_SAVE_EXPO_DECL (expo); |
- MPFR_ZIV_DECL (loop); |
- |
- MPFR_LOG_FUNC (("x[%#R]=%R rnd=%d", x, x, rnd_mode), |
- ("acos[%#R]=%R inexact=%d", acos, acos, inexact)); |
- |
- /* Singular cases */ |
- if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x))) |
- { |
- if (MPFR_IS_NAN (x) || MPFR_IS_INF (x)) |
- { |
- MPFR_SET_NAN (acos); |
- MPFR_RET_NAN; |
- } |
- else /* necessarily x=0 */ |
- { |
- MPFR_ASSERTD(MPFR_IS_ZERO(x)); |
- /* acos(0)=Pi/2 */ |
- inexact = mpfr_const_pi (acos, rnd_mode); |
- mpfr_div_2ui (acos, acos, 1, rnd_mode); /* exact */ |
- MPFR_RET (inexact); |
- } |
- } |
- |
- /* Set x_p=|x| */ |
- sign = MPFR_SIGN (x); |
- mpfr_init2 (xp, MPFR_PREC (x)); |
- mpfr_abs (xp, x, GMP_RNDN); /* Exact */ |
- |
- compared = mpfr_cmp_ui (xp, 1); |
- |
- if (MPFR_UNLIKELY (compared >= 0)) |
- { |
- mpfr_clear (xp); |
- if (compared > 0) /* acos(x) = NaN for x > 1 */ |
- { |
- MPFR_SET_NAN(acos); |
- MPFR_RET_NAN; |
- } |
- else |
- { |
- if (MPFR_IS_POS_SIGN (sign)) /* acos(+1) = 0 */ |
- return mpfr_set_ui (acos, 0, rnd_mode); |
- else /* acos(-1) = Pi */ |
- return mpfr_const_pi (acos, rnd_mode); |
- } |
- } |
- |
- MPFR_SAVE_EXPO_MARK (expo); |
- |
- /* Compute the supplement */ |
- mpfr_ui_sub (xp, 1, xp, GMP_RNDD); |
- if (MPFR_IS_POS_SIGN (sign)) |
- supplement = 2 - 2 * MPFR_GET_EXP (xp); |
- else |
- supplement = 2 - MPFR_GET_EXP (xp); |
- mpfr_clear (xp); |
- |
- prec = MPFR_PREC (acos) + 10 + supplement; |
- |
- /* VL: The following change concerning prec comes from r3145 |
- "Optimize mpfr_acos by choosing a better initial precision." |
- but it doesn't seem to be correct and leads to problems (assertion |
- failure or very important inefficiency) with tiny arguments. |
- Therefore, I've disabled it. */ |
- /* If x ~ 2^-N, acos(x) ~ PI/2 - x - x^3/6 |
- If Prec < 2*N, we can't round since x^3/6 won't be counted. */ |
-#if 0 |
- if (MPFR_PREC (acos) >= MPFR_PREC (x) && MPFR_GET_EXP (x) < 0) |
- { |
- mpfr_uexp_t pmin = (mpfr_uexp_t) (-2 * MPFR_GET_EXP (x)) + 5; |
- MPFR_ASSERTN (pmin <= MPFR_PREC_MAX); |
- if (prec < pmin) |
- prec = pmin; |
- } |
-#endif |
- |
- mpfr_init2 (tmp, prec); |
- mpfr_init2 (arcc, prec); |
- |
- MPFR_ZIV_INIT (loop, prec); |
- for (;;) |
- { |
- /* acos(x) = Pi/2 - asin(x) = Pi/2 - atan(x/sqrt(1-x^2)) */ |
- mpfr_sqr (tmp, x, GMP_RNDN); |
- mpfr_ui_sub (tmp, 1, tmp, GMP_RNDN); |
- mpfr_sqrt (tmp, tmp, GMP_RNDN); |
- mpfr_div (tmp, x, tmp, GMP_RNDN); |
- mpfr_atan (arcc, tmp, GMP_RNDN); |
- mpfr_const_pi (tmp, GMP_RNDN); |
- mpfr_div_2ui (tmp, tmp, 1, GMP_RNDN); |
- mpfr_sub (arcc, tmp, arcc, GMP_RNDN); |
- |
- if (MPFR_LIKELY (MPFR_CAN_ROUND (arcc, prec-supplement, |
- MPFR_PREC (acos), rnd_mode))) |
- break; |
- MPFR_ZIV_NEXT (loop, prec); |
- mpfr_set_prec (tmp, prec); |
- mpfr_set_prec (arcc, prec); |
- } |
- MPFR_ZIV_FREE (loop); |
- |
- inexact = mpfr_set (acos, arcc, rnd_mode); |
- mpfr_clear (tmp); |
- mpfr_clear (arcc); |
- |
- MPFR_SAVE_EXPO_FREE (expo); |
- return mpfr_check_range (acos, inexact, rnd_mode); |
-} |