1 /* Test count_leading_zeros and count_trailing_zeros. 2 3 Copyright 2001, 2002, 2003 Free Software Foundation, Inc. 4 5 This file is part of the GNU MP Library. 6 7 The GNU MP Library is free software; you can redistribute it and/or modify 8 it under the terms of the GNU Lesser General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or (at your 10 option) any later version. 11 12 The GNU MP Library is distributed in the hope that it will be useful, but 13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15 License for more details. 16 17 You should have received a copy of the GNU Lesser General Public License 18 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include "gmp.h" 23 #include "gmp-impl.h" 24 #include "longlong.h" 25 #include "tests.h" 26 27 void 28 check_clz (int want, mp_limb_t n) 29 { 30 int got; 31 count_leading_zeros (got, n); 32 if (got != want) 33 { 34 printf ("count_leading_zeros wrong\n"); 35 mp_limb_trace (" n ", n); 36 printf (" want %d\n", want); 37 printf (" got %d\n", got); 38 abort (); 39 } 40 } 41 42 void 43 check_ctz (int want, mp_limb_t n) 44 { 45 int got; 46 count_trailing_zeros (got, n); 47 if (got != want) 48 { 49 printf ("count_trailing_zeros wrong\n"); 50 mpn_trace (" n ", &n, (mp_size_t) 1); 51 printf (" want %d\n", want); 52 printf (" got %d\n", got); 53 abort (); 54 } 55 } 56 57 void 58 check_various (void) 59 { 60 int i; 61 62 #ifdef COUNT_LEADING_ZEROS_0 63 check_clz (COUNT_LEADING_ZEROS_0, CNST_LIMB(0)); 64 #endif 65 66 for (i=0; i < GMP_LIMB_BITS; i++) 67 { 68 check_clz (i, CNST_LIMB(1) << (GMP_LIMB_BITS-1-i)); 69 check_ctz (i, CNST_LIMB(1) << i); 70 71 check_ctz (i, MP_LIMB_T_MAX << i); 72 check_clz (i, MP_LIMB_T_MAX >> i); 73 } 74 } 75 76 77 int 78 main (int argc, char *argv[]) 79 { 80 tests_start (); 81 mp_trace_base = 16; 82 83 check_various (); 84 85 tests_end (); 86 exit (0); 87 } 88