| /* Test mpf_sub. |
| |
| Copyright 1996, 2001, 2004 Free Software Foundation, Inc. |
| |
| This file is part of the GNU MP Library. |
| |
| The GNU MP 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 3 of the License, or (at your |
| option) any later version. |
| |
| The GNU MP 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 MP Library. If not, see http://www.gnu.org/licenses/. */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "gmp.h" |
| #include "gmp-impl.h" |
| #include "tests.h" |
| |
| #ifndef SIZE |
| #define SIZE 16 |
| #endif |
| |
| void |
| check_rand (int argc, char **argv) |
| { |
| mp_size_t size; |
| mp_exp_t exp; |
| int reps = 20000; |
| int i; |
| mpf_t u, v, w, wref; |
| mp_size_t bprec = 100; |
| mpf_t rerr, max_rerr, limit_rerr; |
| |
| if (argc > 1) |
| { |
| reps = strtol (argv[1], 0, 0); |
| if (argc > 2) |
| bprec = strtol (argv[2], 0, 0); |
| } |
| |
| mpf_set_default_prec (bprec); |
| |
| mpf_init_set_ui (limit_rerr, 1); |
| mpf_div_2exp (limit_rerr, limit_rerr, bprec); |
| #if VERBOSE |
| mpf_dump (limit_rerr); |
| #endif |
| mpf_init (rerr); |
| mpf_init_set_ui (max_rerr, 0); |
| |
| mpf_init (u); |
| mpf_init (v); |
| mpf_init (w); |
| mpf_init (wref); |
| for (i = 0; i < reps; i++) |
| { |
| size = urandom () % (2 * SIZE) - SIZE; |
| exp = urandom () % SIZE; |
| mpf_random2 (u, size, exp); |
| |
| size = urandom () % (2 * SIZE) - SIZE; |
| exp = urandom () % SIZE; |
| mpf_random2 (v, size, exp); |
| |
| if ((urandom () & 1) != 0) |
| mpf_add_ui (u, v, 1); |
| else if ((urandom () & 1) != 0) |
| mpf_sub_ui (u, v, 1); |
| |
| mpf_sub (w, u, v); |
| refmpf_sub (wref, u, v); |
| |
| mpf_reldiff (rerr, w, wref); |
| if (mpf_cmp (rerr, max_rerr) > 0) |
| { |
| mpf_set (max_rerr, rerr); |
| #if VERBOSE |
| mpf_dump (max_rerr); |
| #endif |
| if (mpf_cmp (rerr, limit_rerr) > 0) |
| { |
| printf ("ERROR after %d tests\n", i); |
| printf (" u = "); mpf_dump (u); |
| printf (" v = "); mpf_dump (v); |
| printf ("wref = "); mpf_dump (wref); |
| printf (" w = "); mpf_dump (w); |
| abort (); |
| } |
| } |
| } |
| |
| mpf_clear (limit_rerr); |
| mpf_clear (rerr); |
| mpf_clear (max_rerr); |
| |
| mpf_clear (u); |
| mpf_clear (v); |
| mpf_clear (w); |
| mpf_clear (wref); |
| } |
| |
| |
| void |
| check_data (void) |
| { |
| static const struct { |
| struct { |
| int exp, size; |
| mp_limb_t d[10]; |
| } x, y, want; |
| |
| } data[] = { |
| { { 123, 2, { 8, 9 } }, { 123, 1, { 9 } }, { 122, 1, { 8 } } }, |
| |
| /* f - f == 0, various sizes. |
| These exercise a past problem (gmp 4.1.3 and earlier) where the |
| result exponent was not zeroed on a zero result like this. */ |
| { { 0, 0 }, { 0, 0 }, { 0, 0 } }, |
| { { 99, 1, { 1 } }, { 99, 1, { 1 } }, { 0, 0 } }, |
| { { 99, 2, { 123, 456 } }, { 99, 2, { 123, 456 } }, { 0, 0 } }, |
| { { 99, 3, { 123, 456, 789 } }, { 99, 3, { 123, 456, 789 } }, { 0, 0 } }, |
| |
| /* High limbs cancel, leaving just the low limbs of the longer operand. |
| This exercises a past problem (gmp 4.1.3 and earlier) where high zero |
| limbs on the remainder were not stripped before truncating to the |
| destination, causing loss of precision. */ |
| { { 123, 2, { 8, 9 } }, { 123, 1, { 9 } }, { 122, 1, { 8 } } }, |
| { { 123, 3, { 8, 0, 9 } }, { 123, 1, { 9 } }, { 121, 1, { 8 } } }, |
| { { 123, 4, { 8, 0, 0, 9 } }, { 123, 1, { 9 } }, { 120, 1, { 8 } } }, |
| { { 123, 5, { 8, 0, 0, 0, 9 } }, { 123, 1, { 9 } }, { 119, 1, { 8 } } }, |
| { { 123, 6, { 8, 0, 0, 0, 0, 9 } }, { 123, 1, { 9 } }, { 118, 1, { 8 } } }, |
| |
| }; |
| |
| mpf_t x, y, got, want; |
| int i, swap; |
| |
| mp_trace_base = 16; |
| mpf_init (got); |
| |
| for (i = 0; i < numberof (data); i++) |
| { |
| for (swap = 0; swap <= 1; swap++) |
| { |
| PTR(x) = (mp_ptr) data[i].x.d; |
| SIZ(x) = data[i].x.size; |
| EXP(x) = data[i].x.exp; |
| PREC(x) = numberof (data[i].x.d); |
| MPF_CHECK_FORMAT (x); |
| |
| PTR(y) = (mp_ptr) data[i].y.d; |
| SIZ(y) = data[i].y.size; |
| EXP(y) = data[i].y.exp; |
| PREC(y) = numberof (data[i].y.d); |
| MPF_CHECK_FORMAT (y); |
| |
| PTR(want) = (mp_ptr) data[i].want.d; |
| SIZ(want) = data[i].want.size; |
| EXP(want) = data[i].want.exp; |
| PREC(want) = numberof (data[i].want.d); |
| MPF_CHECK_FORMAT (want); |
| |
| if (swap) |
| { |
| mpf_swap (x, y); |
| SIZ(want) = - SIZ(want); |
| } |
| |
| mpf_sub (got, x, y); |
| /* MPF_CHECK_FORMAT (got); */ |
| |
| if (mpf_cmp (got, want) != 0) |
| { |
| printf ("check_data() wrong reault at data[%d] (operands%s swapped)\n", i, swap ? "" : " not"); |
| mpf_trace ("x ", x); |
| mpf_trace ("y ", y); |
| mpf_trace ("got ", got); |
| mpf_trace ("want", want); |
| abort (); |
| } |
| } |
| } |
| |
| mpf_clear (got); |
| } |
| |
| |
| int |
| main (int argc, char **argv) |
| { |
| tests_start (); |
| |
| check_data (); |
| check_rand (argc, argv); |
| |
| tests_end (); |
| exit (0); |
| } |