--- /dev/null
+/* Test mpz_gcd, mpz_gcdext, and mpz_gcd_ui.
+
+Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001, 2002, 2003, 2004, 2005,
+2008, 2009 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"
+
+void one_test __GMP_PROTO ((mpz_t, mpz_t, mpz_t, int));
+void debug_mp __GMP_PROTO ((mpz_t, int));
+
+static int gcdext_valid_p __GMP_PROTO ((const mpz_t a, const mpz_t b, const mpz_t g, const mpz_t s));
+
+void
+check_data (void)
+{
+ static const struct {
+ const char *a;
+ const char *b;
+ const char *want;
+ } data[] = {
+ /* This tickled a bug in gmp 4.1.2 mpn/x86/k6/gcd_finda.asm. */
+ { "0x3FFC000007FFFFFFFFFF00000000003F83FFFFFFFFFFFFFFF80000000000000001",
+ "0x1FFE0007FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC000000000000000000000001",
+ "5" }
+ };
+
+ mpz_t a, b, got, want;
+ int i;
+
+ mpz_init (a);
+ mpz_init (b);
+ mpz_init (got);
+ mpz_init (want);
+
+ for (i = 0; i < numberof (data); i++)
+ {
+ mpz_set_str_or_abort (a, data[i].a, 0);
+ mpz_set_str_or_abort (b, data[i].b, 0);
+ mpz_set_str_or_abort (want, data[i].want, 0);
+ mpz_gcd (got, a, b);
+ MPZ_CHECK_FORMAT (got);
+ if (mpz_cmp (got, want) != 0)
+ {
+ printf ("mpz_gcd wrong on data[%d]\n", i);
+ printf (" a %s\n", data[i].a);
+ printf (" b %s\n", data[i].b);
+ mpz_trace (" a", a);
+ mpz_trace (" b", b);
+ mpz_trace (" want", want);
+ mpz_trace (" got ", got);
+ abort ();
+ }
+ }
+
+ mpz_clear (a);
+ mpz_clear (b);
+ mpz_clear (got);
+ mpz_clear (want);
+}
+
+/* Keep one_test's variables global, so that we don't need
+ to reinitialize them for each test. */
+mpz_t gcd1, gcd2, s, t, temp1, temp2;
+
+#if GCD_DC_THRESHOLD > GCDEXT_DC_THRESHOLD
+#define MAX_SCHOENHAGE_THRESHOLD GCD_DC_THRESHOLD
+#else
+#define MAX_SCHOENHAGE_THRESHOLD GCDEXT_DC_THRESHOLD
+#endif
+
+/* Define this to make all operands be large enough for Schoenhage gcd
+ to be used. */
+#ifndef WHACK_SCHOENHAGE
+#define WHACK_SCHOENHAGE 0
+#endif
+
+#if WHACK_SCHOENHAGE
+#define MIN_OPERAND_BITSIZE (MAX_SCHOENHAGE_THRESHOLD * GMP_NUMB_BITS)
+#else
+#define MIN_OPERAND_BITSIZE 1
+#endif
+
+int
+main (int argc, char **argv)
+{
+ mpz_t op1, op2, ref;
+ int i, j, chain_len;
+ gmp_randstate_ptr rands;
+ mpz_t bs;
+ unsigned long bsi, size_range;
+ int reps = 100;
+
+ if (argc == 2)
+ reps = atoi (argv[1]);
+
+ tests_start ();
+ rands = RANDS;
+
+ check_data ();
+
+ mpz_init (bs);
+ mpz_init (op1);
+ mpz_init (op2);
+ mpz_init (ref);
+ mpz_init (gcd1);
+ mpz_init (gcd2);
+ mpz_init (temp1);
+ mpz_init (temp2);
+ mpz_init (s);
+ mpz_init (t);
+
+#if 0
+ mpz_set_str (op1, "4da8e405e0d2f70d6d679d3de08a5100a81ec2cff40f97b313ae75e1183f1df2b244e194ebb02a4ece50d943640a301f0f6cc7f539117b783c3f3a3f91649f8a00d2e1444d52722810562bce02fccdbbc8fe3276646e306e723dd3b", 16);
+ mpz_set_str (op2, "76429e12e4fdd8929d89c21657097fbac09d1dc08cf7f1323a34e78ca34226e1a7a29b86fee0fa7fe2cc2a183d46d50df1fe7029590974ad7da77605f35f902cb8b9b8d22dd881eaae5919675d49a337145a029c3b33fc2b0", 16);
+ one_test (op1, op2, NULL, -1);
+#endif
+
+ for (i = 0; i < reps; i++)
+ {
+ /* Generate plain operands with unknown gcd. These types of operands
+ have proven to trigger certain bugs in development versions of the
+ gcd code. The "hgcd->row[3].rsize > M" ASSERT is not triggered by
+ the division chain code below, but that is most likely just a result
+ of that other ASSERTs are triggered before it. */
+
+ mpz_urandomb (bs, rands, 32);
+ size_range = mpz_get_ui (bs) % 13 + 2;
+
+ mpz_urandomb (bs, rands, size_range);
+ mpz_urandomb (op1, rands, mpz_get_ui (bs) + MIN_OPERAND_BITSIZE);
+ mpz_urandomb (bs, rands, size_range);
+ mpz_urandomb (op2, rands, mpz_get_ui (bs) + MIN_OPERAND_BITSIZE);
+
+ mpz_urandomb (bs, rands, 8);
+ bsi = mpz_get_ui (bs);
+
+ if ((bsi & 0x3c) == 4)
+ mpz_mul (op1, op1, op2); /* make op1 a multiple of op2 */
+ else if ((bsi & 0x3c) == 8)
+ mpz_mul (op2, op1, op2); /* make op2 a multiple of op1 */
+
+ if ((bsi & 1) != 0)
+ mpz_neg (op1, op1);
+ if ((bsi & 2) != 0)
+ mpz_neg (op2, op2);
+
+ one_test (op1, op2, NULL, i);
+
+ /* Generate a division chain backwards, allowing otherwise unlikely huge
+ quotients. */
+
+ mpz_set_ui (op1, 0);
+ mpz_urandomb (bs, rands, 32);
+ mpz_urandomb (bs, rands, mpz_get_ui (bs) % 16 + 1);
+ mpz_rrandomb (op2, rands, mpz_get_ui (bs));
+ mpz_add_ui (op2, op2, 1);
+ mpz_set (ref, op2);
+
+#if WHACK_SCHOENHAGE
+ chain_len = 1000000;
+#else
+ mpz_urandomb (bs, rands, 32);
+ chain_len = mpz_get_ui (bs) % (GMP_NUMB_BITS * MAX_SCHOENHAGE_THRESHOLD / 256);
+#endif
+
+ for (j = 0; j < chain_len; j++)
+ {
+ mpz_urandomb (bs, rands, 32);
+ mpz_urandomb (bs, rands, mpz_get_ui (bs) % 12 + 1);
+ mpz_rrandomb (temp2, rands, mpz_get_ui (bs) + 1);
+ mpz_add_ui (temp2, temp2, 1);
+ mpz_mul (temp1, op2, temp2);
+ mpz_add (op1, op1, temp1);
+
+ /* Don't generate overly huge operands. */
+ if (SIZ (op1) > 3 * MAX_SCHOENHAGE_THRESHOLD)
+ break;
+
+ mpz_urandomb (bs, rands, 32);
+ mpz_urandomb (bs, rands, mpz_get_ui (bs) % 12 + 1);
+ mpz_rrandomb (temp2, rands, mpz_get_ui (bs) + 1);
+ mpz_add_ui (temp2, temp2, 1);
+ mpz_mul (temp1, op1, temp2);
+ mpz_add (op2, op2, temp1);
+
+ /* Don't generate overly huge operands. */
+ if (SIZ (op2) > 3 * MAX_SCHOENHAGE_THRESHOLD)
+ break;
+ }
+ one_test (op1, op2, ref, i);
+ }
+
+ mpz_clear (bs);
+ mpz_clear (op1);
+ mpz_clear (op2);
+ mpz_clear (ref);
+ mpz_clear (gcd1);
+ mpz_clear (gcd2);
+ mpz_clear (temp1);
+ mpz_clear (temp2);
+ mpz_clear (s);
+ mpz_clear (t);
+
+ tests_end ();
+ exit (0);
+}
+
+void
+debug_mp (mpz_t x, int base)
+{
+ mpz_out_str (stderr, base, x); fputc ('\n', stderr);
+}
+
+void
+one_test (mpz_t op1, mpz_t op2, mpz_t ref, int i)
+{
+ /*
+ printf ("%ld %ld %ld\n", SIZ (op1), SIZ (op2), SIZ (ref));
+ fflush (stdout);
+ */
+
+ /*
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ */
+
+ mpz_gcdext (gcd1, s, NULL, op1, op2);
+ MPZ_CHECK_FORMAT (gcd1);
+ MPZ_CHECK_FORMAT (s);
+
+ if (ref && mpz_cmp (ref, gcd1) != 0)
+ {
+ fprintf (stderr, "ERROR in test %d\n", i);
+ fprintf (stderr, "mpz_gcdext returned incorrect result\n");
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ fprintf (stderr, "expected result:\n"); debug_mp (ref, -16);
+ fprintf (stderr, "mpz_gcdext returns:\n");debug_mp (gcd1, -16);
+ abort ();
+ }
+
+ if (!gcdext_valid_p(op1, op2, gcd1, s))
+ {
+ fprintf (stderr, "ERROR in test %d\n", i);
+ fprintf (stderr, "mpz_gcdext returned invalid result\n");
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ fprintf (stderr, "mpz_gcdext returns:\n");debug_mp (gcd1, -16);
+ fprintf (stderr, "s="); debug_mp (s, -16);
+ abort ();
+ }
+
+ mpz_gcd (gcd2, op1, op2);
+ MPZ_CHECK_FORMAT (gcd2);
+
+ if (mpz_cmp (gcd2, gcd1) != 0)
+ {
+ fprintf (stderr, "ERROR in test %d\n", i);
+ fprintf (stderr, "mpz_gcd returned incorrect result\n");
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ fprintf (stderr, "expected result:\n"); debug_mp (gcd1, -16);
+ fprintf (stderr, "mpz_gcd returns:\n"); debug_mp (gcd2, -16);
+ abort ();
+ }
+
+ /* This should probably move to t-gcd_ui.c */
+ if (mpz_fits_ulong_p (op1) || mpz_fits_ulong_p (op2))
+ {
+ if (mpz_fits_ulong_p (op1))
+ mpz_gcd_ui (gcd2, op2, mpz_get_ui (op1));
+ else
+ mpz_gcd_ui (gcd2, op1, mpz_get_ui (op2));
+ if (mpz_cmp (gcd2, gcd1))
+ {
+ fprintf (stderr, "ERROR in test %d\n", i);
+ fprintf (stderr, "mpz_gcd_ui returned incorrect result\n");
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ fprintf (stderr, "expected result:\n"); debug_mp (gcd1, -16);
+ fprintf (stderr, "mpz_gcd_ui returns:\n"); debug_mp (gcd2, -16);
+ abort ();
+ }
+ }
+
+ mpz_gcdext (gcd2, temp1, temp2, op1, op2);
+ MPZ_CHECK_FORMAT (gcd2);
+ MPZ_CHECK_FORMAT (temp1);
+ MPZ_CHECK_FORMAT (temp2);
+
+ mpz_mul (temp1, temp1, op1);
+ mpz_mul (temp2, temp2, op2);
+ mpz_add (temp1, temp1, temp2);
+
+ if (mpz_cmp (gcd1, gcd2) != 0
+ || mpz_cmp (gcd2, temp1) != 0)
+ {
+ fprintf (stderr, "ERROR in test %d\n", i);
+ fprintf (stderr, "mpz_gcdext returned incorrect result\n");
+ fprintf (stderr, "op1="); debug_mp (op1, -16);
+ fprintf (stderr, "op2="); debug_mp (op2, -16);
+ fprintf (stderr, "expected result:\n"); debug_mp (gcd1, -16);
+ fprintf (stderr, "mpz_gcdext returns:\n");debug_mp (gcd2, -16);
+ abort ();
+ }
+}
+
+/* Called when g is supposed to be gcd(a,b), and g = s a + t b, for some t.
+ Uses temp1 and temp2 */
+static int
+gcdext_valid_p (const mpz_t a, const mpz_t b, const mpz_t g, const mpz_t s)
+{
+ /* It's not clear that gcd(0,0) is well defined, but we allow it and require that
+ gcd(0,0) = 0. */
+ if (mpz_sgn (g) < 0)
+ return 0;
+
+ if (mpz_sgn (a) == 0)
+ {
+ /* Must have g == abs (b). Any value for s is in some sense "correct",
+ but it makes sense to require that s == 0. */
+ return mpz_cmpabs (g, b) == 0 && mpz_sgn (s) == 0;
+ }
+ else if (mpz_sgn (b) == 0)
+ {
+ /* Must have g == abs (a), s == sign (a) */
+ return mpz_cmpabs (g, a) == 0 && mpz_cmp_si (s, mpz_sgn (a)) == 0;
+ }
+
+ if (mpz_sgn (g) <= 0)
+ return 0;
+
+ if (! (mpz_divisible_p (a, g)
+ && mpz_divisible_p (b, g)
+ && mpz_cmpabs (s, b) <= 0))
+ return 0;
+
+ mpz_mul(temp1, s, a);
+ mpz_sub(temp1, g, temp1);
+ mpz_tdiv_qr(temp1, temp2, temp1, b);
+
+ return mpz_sgn (temp2) == 0 && mpz_cmpabs (temp1, a) <= 0;
+}
projects / msp430-gcc.git / blobdiff