| /* Test file for mpfr_atan. |
| |
| 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. |
| |
| 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 <stdio.h> |
| #include <stdlib.h> |
| |
| #include "mpfr-test.h" |
| |
| static void |
| special (void) |
| { |
| mpfr_t x, y, z; |
| int r; |
| int i; |
| |
| mpfr_init2 (x, 53); |
| mpfr_init2 (y, 53); |
| mpfr_init2 (z, 53); |
| |
| mpfr_set_str_binary (x, "1.0000100110000001100111100011001110101110100111011101"); |
| mpfr_set_str_binary (y, "1.1001101101110100101100110011011101101000011010111110e-1"); |
| mpfr_atan (z, x, GMP_RNDN); |
| if (mpfr_cmp (y, z)) |
| { |
| printf ("Error in mpfr_atan for prec=53, rnd=GMP_RNDN\n"); |
| printf ("x="); |
| mpfr_out_str (stdout, 2, 0, x, GMP_RNDN); |
| printf ("\nexpected "); |
| mpfr_out_str (stdout, 2, 0, y, GMP_RNDN); |
| printf ("\ngot "); |
| mpfr_out_str (stdout, 2, 0, z, GMP_RNDN); |
| printf ("\n"); |
| exit (1); |
| } |
| |
| /* atan(+Inf) = Pi/2 */ |
| for (r = 0; r < GMP_RND_MAX ; r++) |
| { |
| mpfr_set_inf (x, 1); |
| mpfr_atan (y, x, (mp_rnd_t) r); |
| mpfr_const_pi (x, (mp_rnd_t) r); |
| mpfr_div_2exp (x, x, 1, (mp_rnd_t) r); |
| if (mpfr_cmp (x, y)) |
| { |
| printf ("Error: mpfr_atan(+Inf), rnd=%s\n", |
| mpfr_print_rnd_mode ((mp_rnd_t) r)); |
| exit (1); |
| } |
| } |
| |
| /* atan(-Inf) = - Pi/2 */ |
| for (r = 0; r < GMP_RND_MAX ; r++) |
| { |
| mpfr_set_inf (x, -1); |
| mpfr_atan (y, x, (mp_rnd_t) r); |
| mpfr_const_pi (x, MPFR_INVERT_RND((mp_rnd_t) r)); |
| mpfr_neg (x, x, (mp_rnd_t) r); |
| mpfr_div_2exp (x, x, 1, (mp_rnd_t) r); |
| if (mpfr_cmp (x, y)) |
| { |
| printf ("Error: mpfr_atan(-Inf), rnd=%s\n", |
| mpfr_print_rnd_mode ((mp_rnd_t) r)); |
| exit (1); |
| } |
| } |
| |
| /* atan(NaN) = NaN */ |
| mpfr_set_nan (x); |
| mpfr_atan (y, x, GMP_RNDN); |
| if (!mpfr_nan_p (y)) |
| { |
| printf ("Error: mpfr_atan(NaN) <> NaN\n"); |
| exit (1); |
| } |
| |
| /* atan(+/-0) = +/-0 */ |
| mpfr_set_ui (x, 0, GMP_RNDN); |
| MPFR_SET_NEG (y); |
| mpfr_atan (y, x, GMP_RNDN); |
| if (mpfr_cmp_ui (y, 0) || MPFR_IS_NEG (y)) |
| { |
| printf ("Error: mpfr_atan (+0) <> +0\n"); |
| exit (1); |
| } |
| mpfr_atan (x, x, GMP_RNDN); |
| if (mpfr_cmp_ui (x, 0) || MPFR_IS_NEG (x)) |
| { |
| printf ("Error: mpfr_atan (+0) <> +0 (in place)\n"); |
| exit (1); |
| } |
| mpfr_neg (x, x, GMP_RNDN); |
| MPFR_SET_POS (y); |
| mpfr_atan (y, x, GMP_RNDN); |
| if (mpfr_cmp_ui (y, 0) || MPFR_IS_POS (y)) |
| { |
| printf ("Error: mpfr_atan (-0) <> -0\n"); |
| exit (1); |
| } |
| mpfr_atan (x, x, GMP_RNDN); |
| if (mpfr_cmp_ui (x, 0) || MPFR_IS_POS (x)) |
| { |
| printf ("Error: mpfr_atan (-0) <> -0 (in place)\n"); |
| exit (1); |
| } |
| |
| mpfr_set_prec (x, 32); |
| mpfr_set_prec (y, 32); |
| |
| /* test one random positive argument */ |
| mpfr_set_str_binary (x, "0.10000100001100101001001001011001"); |
| mpfr_atan (x, x, GMP_RNDN); |
| mpfr_set_str_binary (y, "0.1111010000001111001111000000011E-1"); |
| if (mpfr_cmp (x, y)) |
| { |
| printf ("Error in mpfr_atan (1)\n"); |
| exit (1); |
| } |
| |
| /* test one random negative argument */ |
| mpfr_set_str_binary (x, "-0.1100001110110000010101011001011"); |
| mpfr_atan (x, x, GMP_RNDN); |
| mpfr_set_str_binary (y, "-0.101001110001010010110001110001"); |
| if (mpfr_cmp (x, y)) |
| { |
| printf ("Error in mpfr_atan (2)\n"); |
| mpfr_print_binary (x); printf ("\n"); |
| mpfr_print_binary (y); printf ("\n"); |
| exit (1); |
| } |
| |
| mpfr_set_prec (x, 3); |
| mpfr_set_prec (y, 192); |
| mpfr_set_prec (z, 192); |
| mpfr_set_str_binary (x, "-0.100e1"); |
| mpfr_atan (z, x, GMP_RNDD); |
| mpfr_set_str_binary (y, "-0.110010010000111111011010101000100010000101101000110000100011010011000100110001100110001010001011100000001101110000011100110100010010100100000010010011100000100010001010011001111100110001110101"); |
| if (mpfr_cmp (z, y)) |
| { |
| printf ("Error in mpfr_atan (3)\n"); |
| printf ("Expected "); mpfr_print_binary (y); printf ("\n"); |
| printf ("Got "); mpfr_print_binary (z); printf ("\n"); |
| exit (1); |
| } |
| |
| /* Test regression */ |
| mpfr_set_prec (x, 51); |
| mpfr_set_prec (y, 51); |
| mpfr_set_str_binary (x, |
| "0.101100100000101111111010001111111000001000000000000E-11"); |
| i = mpfr_atan (y, x, GMP_RNDN); |
| if (mpfr_cmp_str (y, |
| "1.01100100000101111111001110011001010110100100000000e-12", 2, GMP_RNDN) |
| || i >= 0) |
| { |
| printf ("Wrong Regression test (%d)\n", i); |
| mpfr_dump (y); |
| exit (1); |
| } |
| |
| mpfr_set_si (x, -1, GMP_RNDN); |
| mpfr_atan (x, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_NEG (x)); |
| |
| /* Test regression */ |
| mpfr_set_prec (x, 48); |
| mpfr_set_prec (y, 48); |
| mpfr_set_str_binary (x, "1.11001110010000011111100000010000000000000000000e-19"); |
| mpfr_atan (y, x, GMP_RNDD); |
| if (mpfr_cmp_str (y, "0.111001110010000011111100000001111111110000010011E-18", 2, GMP_RNDN)) |
| { |
| printf ("Error in mpfr_atan (4)\n"); |
| printf ("Input 1.11001110010000011111100000010000000000000000000e-19 [prec=48]\n"); |
| printf ("Expected 0.111001110010000011111100000001111111110000010011E-18\n"); |
| printf ("Got "); mpfr_dump (y); |
| exit (1); |
| } |
| |
| mpfr_clear (x); |
| mpfr_clear (y); |
| mpfr_clear (z); |
| } |
| |
| #define TEST_FUNCTION mpfr_atan |
| #define test_generic test_generic_atan |
| #define RAND_FUNCTION(x) (mpfr_urandomb (x, RANDS), mpfr_mul_2si (x, x, (randlimb () %1000-500), GMP_RNDN)) |
| #include "tgeneric.c" |
| |
| #define TEST_FUNCTION mpfr_atan2 |
| #define TWO_ARGS |
| #define test_generic test_generic_atan2 |
| #include "tgeneric.c" |
| |
| #define TEST_FUNCTION mpfr_atan2 |
| #define TWO_ARGS |
| #define RAND_FUNCTION(x) (mpfr_urandomb (x, RANDS), MPFR_SET_NEG (x)) |
| #define test_generic test_generic_atan2_neg |
| #include "tgeneric.c" |
| |
| static void |
| special_overflow (void) |
| { |
| mpfr_t x, y; |
| mp_exp_t emin, emax; |
| |
| emin = mpfr_get_emin (); |
| emax = mpfr_get_emax (); |
| |
| set_emin (-125); |
| set_emax (128); |
| mpfr_init2 (x, 24); |
| mpfr_init2 (y, 48); |
| mpfr_set_str_binary (x, "0.101101010001001101111010E0"); |
| mpfr_atan (y, x, GMP_RNDN); |
| if (mpfr_cmp_str (y, "0.100111011001100111000010111101000111010101011110E0", |
| 2, GMP_RNDN)) |
| { |
| printf("Special Overflow error.\n"); |
| mpfr_dump (y); |
| exit (1); |
| } |
| mpfr_clear (y); |
| mpfr_clear (x); |
| set_emin (emin); |
| set_emax (emax); |
| } |
| |
| static void |
| special_atan2 (void) |
| { |
| mpfr_t x, y, z; |
| |
| mpfr_inits2 (4, x, y, z, (mpfr_ptr) 0); |
| |
| /* Anything with NAN should be set to NAN */ |
| mpfr_set_ui (y, 0, GMP_RNDN); |
| mpfr_set_nan (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_NAN (z)); |
| mpfr_swap (x, y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_NAN (z)); |
| |
| /* 0+ 0+ --> 0+ */ |
| mpfr_set_ui (y, 0, GMP_RNDN); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_POS (z)); |
| /* 0- 0+ --> 0- */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_NEG (z)); |
| /* 0- 0- --> -PI */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-3.1415", 10, GMP_RNDN) == 0); |
| /* 0+ 0- --> +PI */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "3.1415", 10, GMP_RNDN) == 0); |
| /* 0+ -1 --> PI */ |
| mpfr_set_si (x, -1, GMP_RNDN); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "3.1415", 10, GMP_RNDN) == 0); |
| /* 0- -1 --> -PI */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-3.1415", 10, GMP_RNDN) == 0); |
| /* 0- +1 --> 0- */ |
| mpfr_set_ui (x, 1, GMP_RNDN); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_NEG (z)); |
| /* 0+ +1 --> 0+ */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_POS (z)); |
| /* +1 0+ --> PI/2 */ |
| mpfr_swap (x, y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "1.57075", 10, GMP_RNDN) == 0); |
| /* +1 0- --> PI/2 */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "1.57075", 10, GMP_RNDN) == 0); |
| /* -1 0- --> -PI/2 */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-1.57075", 10, GMP_RNDN) == 0); |
| /* -1 0+ --> -PI/2 */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-1.57075", 10, GMP_RNDN) == 0); |
| |
| /* -1 +INF --> -0 */ |
| MPFR_SET_INF (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_NEG (z)); |
| /* +1 +INF --> +0 */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (MPFR_IS_ZERO (z) && MPFR_IS_POS (z)); |
| /* +1 -INF --> +PI */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "3.1415", 10, GMP_RNDN) == 0); |
| /* -1 -INF --> -PI */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-3.1415", 10, GMP_RNDN) == 0); |
| /* -INF -1 --> -PI/2 */ |
| mpfr_swap (x, y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-1.57075", 10, GMP_RNDN) == 0); |
| /* +INF -1 --> PI/2 */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "1.57075", 10, GMP_RNDN) == 0); |
| /* +INF -INF --> 3*PI/4 */ |
| MPFR_SET_INF (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "2.356194490192344928", 10, GMP_RNDN) == 0); |
| /* +INF +INF --> PI/4 */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "0.785375", 10, GMP_RNDN) == 0); |
| /* -INF +INF --> -PI/4 */ |
| MPFR_CHANGE_SIGN (y); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-0.785375", 10, GMP_RNDN) == 0); |
| /* -INF -INF --> -3*PI/4 */ |
| MPFR_CHANGE_SIGN (x); |
| mpfr_atan2 (z, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_cmp_str (z, "-2.356194490192344928", 10, GMP_RNDN) == 0); |
| |
| mpfr_clears (x, y, z, (mpfr_ptr) 0); |
| } |
| |
| /* from Christopher Creutzig, 18 Jul 2007 */ |
| static void |
| smallvals_atan2 (void) |
| { |
| mpfr_t a, x, y; |
| mp_exp_t old_emin; |
| |
| mpfr_inits (a, x, y, (mpfr_ptr) 0); |
| mpfr_set_ui (y, 0, GMP_RNDN); |
| mpfr_nextbelow (y); |
| mpfr_set_ui (x, 1, GMP_RNDN); |
| /* y=-2^(-emin-1), x=1 */ |
| |
| mpfr_atan2 (a, y, x, GMP_RNDD); |
| MPFR_ASSERTN (mpfr_equal_p (a, y)); |
| |
| mpfr_atan2 (a, y, x, GMP_RNDU); |
| MPFR_ASSERTN (mpfr_zero_p (a) && MPFR_IS_NEG(a)); |
| |
| mpfr_set_prec (x, 8); |
| mpfr_set_prec (y, 8); |
| mpfr_set_prec (a, 8); |
| old_emin = mpfr_get_emin (); |
| mpfr_set_emin (MPFR_EMIN_MIN); |
| |
| mpfr_set_si (y, 3, GMP_RNDN); |
| mpfr_set_exp (y, mpfr_get_emin ()); |
| mpfr_set_str_binary (x, "1.1"); |
| mpfr_atan2 (a, y, x, GMP_RNDU); |
| mpfr_set_si (y, 1, GMP_RNDN); |
| mpfr_set_exp (y, mpfr_get_emin ()); |
| MPFR_ASSERTN (mpfr_equal_p (a, y)); |
| |
| /* From a bug reported by Christopher Creutzig on 2007-08-28. |
| Added test in each rounding mode. |
| Segmentation fault or assertion failure due to an infinite Ziv loop. */ |
| mpfr_set_si (y, 1, GMP_RNDN); |
| mpfr_set_exp (y, mpfr_get_emin ()); |
| mpfr_set_str_binary (x, "1.01"); |
| mpfr_atan2 (a, y, x, GMP_RNDZ); |
| MPFR_ASSERTN (mpfr_zero_p (a)); |
| mpfr_atan2 (a, y, x, GMP_RNDD); |
| MPFR_ASSERTN (mpfr_zero_p (a)); |
| mpfr_atan2 (a, y, x, GMP_RNDU); |
| MPFR_ASSERTN (mpfr_equal_p (a, y)); |
| mpfr_atan2 (a, y, x, GMP_RNDN); |
| MPFR_ASSERTN (mpfr_equal_p (a, y)); |
| |
| mpfr_set_emin (old_emin); |
| |
| mpfr_clears (a, x, y, (mpfr_ptr) 0); |
| } |
| |
| /* Bug found by Robert Bajema (regression in MPFR 2.3.0). |
| The cause is the underflow flag set before the mpfr_atan2 call. */ |
| static void |
| atan2_bug_20071003 (void) |
| { |
| mpfr_t a, x, y, z; |
| |
| mpfr_inits (a, x, y, z, (mpfr_ptr) 0); |
| |
| mpfr_set_underflow (); |
| mpfr_set_str_binary (y, |
| "-0.10100110110100110111010110111111100110100010001110110E2"); |
| mpfr_set_str_binary (x, |
| "0.10100101010110010100010010111000110110011110001011110E3"); |
| mpfr_set_str_binary (z, |
| "-0.11101111001101101100111011001101000010010111101110110E-1"); |
| mpfr_atan2 (a, y, x, GMP_RNDN); |
| if (! mpfr_equal_p (a, z)) |
| { |
| printf ("mpfr_atan2 fails on:\n"); |
| printf (" y = "); |
| mpfr_dump (y); |
| printf (" x = "); |
| mpfr_dump (x); |
| printf ("Expected "); |
| mpfr_dump (z); |
| printf ("Got "); |
| mpfr_dump (a); |
| exit (1); |
| } |
| |
| mpfr_clears (a, x, y, z, (mpfr_ptr) 0); |
| } |
| |
| int |
| main (int argc, char *argv[]) |
| { |
| tests_start_mpfr (); |
| |
| special_overflow (); |
| special (); |
| special_atan2 (); |
| smallvals_atan2 (); |
| atan2_bug_20071003 (); |
| |
| test_generic_atan (2, 200, 17); |
| test_generic_atan2 (2, 200, 17); |
| test_generic_atan2_neg (2, 200, 17); |
| |
| data_check ("data/atan", mpfr_atan, "mpfr_atan"); |
| bad_cases (mpfr_atan, mpfr_tan, "mpfr_atan", 256, -40, 1, 4, 128, 800, 40); |
| |
| tests_end_mpfr (); |
| return 0; |
| } |