1 extern crate num_bigint;
2 extern crate num_traits;
3
4 use num_bigint::{BigInt, Sign, ToBigInt};
5 use num_traits::ToPrimitive;
6 use std::{i32, i64, u32};
7
8 enum ValueVec {
9 N,
10 P(&'static [u32]),
11 M(&'static [u32]),
12 }
13
14 use ValueVec::*;
15
16 impl ToBigInt for ValueVec {
to_bigint(&self) -> Option<BigInt>17 fn to_bigint(&self) -> Option<BigInt> {
18 match self {
19 &N => Some(BigInt::from_slice(Sign::NoSign, &[])),
20 &P(s) => Some(BigInt::from_slice(Sign::Plus, s)),
21 &M(s) => Some(BigInt::from_slice(Sign::Minus, s)),
22 }
23 }
24 }
25
26 // a, !a
27 const NOT_VALUES: &'static [(ValueVec, ValueVec)] = &[
28 (N, M(&[1])),
29 (P(&[1]), M(&[2])),
30 (P(&[2]), M(&[3])),
31 (P(&[!0 - 2]), M(&[!0 - 1])),
32 (P(&[!0 - 1]), M(&[!0])),
33 (P(&[!0]), M(&[0, 1])),
34 (P(&[0, 1]), M(&[1, 1])),
35 (P(&[1, 1]), M(&[2, 1])),
36 ];
37
38 // a, b, a & b, a | b, a ^ b
39 const BITWISE_VALUES: &'static [(ValueVec, ValueVec, ValueVec, ValueVec, ValueVec)] = &[
40 (N, N, N, N, N),
41 (N, P(&[1]), N, P(&[1]), P(&[1])),
42 (N, P(&[!0]), N, P(&[!0]), P(&[!0])),
43 (N, P(&[0, 1]), N, P(&[0, 1]), P(&[0, 1])),
44 (N, M(&[1]), N, M(&[1]), M(&[1])),
45 (N, M(&[!0]), N, M(&[!0]), M(&[!0])),
46 (N, M(&[0, 1]), N, M(&[0, 1]), M(&[0, 1])),
47 (P(&[1]), P(&[!0]), P(&[1]), P(&[!0]), P(&[!0 - 1])),
48 (P(&[!0]), P(&[!0]), P(&[!0]), P(&[!0]), N),
49 (P(&[!0]), P(&[1, 1]), P(&[1]), P(&[!0, 1]), P(&[!0 - 1, 1])),
50 (P(&[1]), M(&[!0]), P(&[1]), M(&[!0]), M(&[0, 1])),
51 (P(&[!0]), M(&[1]), P(&[!0]), M(&[1]), M(&[0, 1])),
52 (P(&[!0]), M(&[!0]), P(&[1]), M(&[1]), M(&[2])),
53 (P(&[!0]), M(&[1, 1]), P(&[!0]), M(&[1, 1]), M(&[0, 2])),
54 (P(&[1, 1]), M(&[!0]), P(&[1, 1]), M(&[!0]), M(&[0, 2])),
55 (M(&[1]), M(&[!0]), M(&[!0]), M(&[1]), P(&[!0 - 1])),
56 (M(&[!0]), M(&[!0]), M(&[!0]), M(&[!0]), N),
57 (M(&[!0]), M(&[1, 1]), M(&[!0, 1]), M(&[1]), P(&[!0 - 1, 1])),
58 ];
59
60 const I32_MIN: i64 = i32::MIN as i64;
61 const I32_MAX: i64 = i32::MAX as i64;
62 const U32_MAX: i64 = u32::MAX as i64;
63
64 // some corner cases
65 const I64_VALUES: &'static [i64] = &[
66 i64::MIN,
67 i64::MIN + 1,
68 i64::MIN + 2,
69 i64::MIN + 3,
70 -U32_MAX - 3,
71 -U32_MAX - 2,
72 -U32_MAX - 1,
73 -U32_MAX,
74 -U32_MAX + 1,
75 -U32_MAX + 2,
76 -U32_MAX + 3,
77 I32_MIN - 3,
78 I32_MIN - 2,
79 I32_MIN - 1,
80 I32_MIN,
81 I32_MIN + 1,
82 I32_MIN + 2,
83 I32_MIN + 3,
84 -3,
85 -2,
86 -1,
87 0,
88 1,
89 2,
90 3,
91 I32_MAX - 3,
92 I32_MAX - 2,
93 I32_MAX - 1,
94 I32_MAX,
95 I32_MAX + 1,
96 I32_MAX + 2,
97 I32_MAX + 3,
98 U32_MAX - 3,
99 U32_MAX - 2,
100 U32_MAX - 1,
101 U32_MAX,
102 U32_MAX + 1,
103 U32_MAX + 2,
104 U32_MAX + 3,
105 i64::MAX - 3,
106 i64::MAX - 2,
107 i64::MAX - 1,
108 i64::MAX,
109 ];
110
111 #[test]
test_not()112 fn test_not() {
113 for &(ref a, ref not) in NOT_VALUES.iter() {
114 let a = a.to_bigint().unwrap();
115 let not = not.to_bigint().unwrap();
116
117 // sanity check for tests that fit in i64
118 if let (Some(prim_a), Some(prim_not)) = (a.to_i64(), not.to_i64()) {
119 assert_eq!(!prim_a, prim_not);
120 }
121
122 assert_eq!(!a.clone(), not, "!{:x}", a);
123 assert_eq!(!not.clone(), a, "!{:x}", not);
124 }
125 }
126
127 #[test]
test_not_i64()128 fn test_not_i64() {
129 for &prim_a in I64_VALUES.iter() {
130 let a = prim_a.to_bigint().unwrap();
131 let not = (!prim_a).to_bigint().unwrap();
132 assert_eq!(!a.clone(), not, "!{:x}", a);
133 }
134 }
135
136 #[test]
test_bitwise()137 fn test_bitwise() {
138 for &(ref a, ref b, ref and, ref or, ref xor) in BITWISE_VALUES.iter() {
139 let a = a.to_bigint().unwrap();
140 let b = b.to_bigint().unwrap();
141 let and = and.to_bigint().unwrap();
142 let or = or.to_bigint().unwrap();
143 let xor = xor.to_bigint().unwrap();
144
145 // sanity check for tests that fit in i64
146 if let (Some(prim_a), Some(prim_b)) = (a.to_i64(), b.to_i64()) {
147 if let Some(prim_and) = and.to_i64() {
148 assert_eq!(prim_a & prim_b, prim_and);
149 }
150 if let Some(prim_or) = or.to_i64() {
151 assert_eq!(prim_a | prim_b, prim_or);
152 }
153 if let Some(prim_xor) = xor.to_i64() {
154 assert_eq!(prim_a ^ prim_b, prim_xor);
155 }
156 }
157
158 assert_eq!(a.clone() & &b, and, "{:x} & {:x}", a, b);
159 assert_eq!(b.clone() & &a, and, "{:x} & {:x}", b, a);
160 assert_eq!(a.clone() | &b, or, "{:x} | {:x}", a, b);
161 assert_eq!(b.clone() | &a, or, "{:x} | {:x}", b, a);
162 assert_eq!(a.clone() ^ &b, xor, "{:x} ^ {:x}", a, b);
163 assert_eq!(b.clone() ^ &a, xor, "{:x} ^ {:x}", b, a);
164 }
165 }
166
167 #[test]
test_bitwise_i64()168 fn test_bitwise_i64() {
169 for &prim_a in I64_VALUES.iter() {
170 let a = prim_a.to_bigint().unwrap();
171 for &prim_b in I64_VALUES.iter() {
172 let b = prim_b.to_bigint().unwrap();
173 let and = (prim_a & prim_b).to_bigint().unwrap();
174 let or = (prim_a | prim_b).to_bigint().unwrap();
175 let xor = (prim_a ^ prim_b).to_bigint().unwrap();
176 assert_eq!(a.clone() & &b, and, "{:x} & {:x}", a, b);
177 assert_eq!(a.clone() | &b, or, "{:x} | {:x}", a, b);
178 assert_eq!(a.clone() ^ &b, xor, "{:x} ^ {:x}", a, b);
179 }
180 }
181 }
182