mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2012 Fredrik Johansson
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******************************************************************************/
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#include "arf.h"
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int
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arf_rsqrt_naive(arf_t z, const arf_t x, long prec, arf_rnd_t rnd)
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{
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fmpr_t a;
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long r;
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fmpr_init(a);
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arf_get_fmpr(a, x);
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r = fmpr_rsqrt(a, a, prec, rnd);
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arf_set_fmpr(z, a);
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fmpr_clear(a);
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return (r == FMPR_RESULT_EXACT) ? 0 : 1;
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}
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int main()
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{
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long iter, iter2;
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flint_rand_t state;
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printf("rsqrt....");
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fflush(stdout);
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flint_randinit(state);
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for (iter = 0; iter < 10000; iter++)
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{
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arf_t x, z, v;
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long prec, r1, r2;
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arf_rnd_t rnd;
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arf_init(x);
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arf_init(z);
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arf_init(v);
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for (iter2 = 0; iter2 < 100; iter2++)
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{
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arf_randtest_special(x, state, 20, 10);
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prec = 2 + n_randint(state, 20);
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switch (n_randint(state, 4))
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{
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case 0: rnd = ARF_RND_DOWN; break;
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case 1: rnd = ARF_RND_UP; break;
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case 2: rnd = ARF_RND_FLOOR; break;
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default: rnd = ARF_RND_CEIL; break;
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}
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switch (n_randint(state, 2))
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{
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case 0:
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r1 = arf_rsqrt(z, x, prec, rnd);
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r2 = arf_rsqrt_naive(v, x, prec, rnd);
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if (!arf_equal(z, v) || r1 != r2)
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{
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printf("FAIL!\n");
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printf("prec = %ld, rnd = %d\n\n", prec, rnd);
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printf("x = "); arf_print(x); printf("\n\n");
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printf("z = "); arf_print(z); printf("\n\n");
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printf("v = "); arf_print(v); printf("\n\n");
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printf("r1 = %ld, r2 = %ld\n", r1, r2);
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abort();
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}
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break;
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default:
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r2 = arf_rsqrt_naive(v, x, prec, rnd);
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r1 = arf_rsqrt(x, x, prec, rnd);
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if (!arf_equal(v, x) || r1 != r2)
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{
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printf("FAIL (aliasing)!\n");
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printf("prec = %ld, rnd = %d\n\n", prec, rnd);
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printf("x = "); arf_print(x); printf("\n\n");
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printf("v = "); arf_print(v); printf("\n\n");
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printf("r1 = %ld, r2 = %ld\n", r1, r2);
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abort();
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}
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break;
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}
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}
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arf_clear(x);
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arf_clear(z);
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arf_clear(v);
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}
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flint_randclear(state);
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flint_cleanup();
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printf("PASS\n");
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return EXIT_SUCCESS;
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}
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