This repository was archived by the owner on Apr 12, 2019. It is now read-only.
forked from JuliaLang/julia
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathchecked.jl
336 lines (297 loc) · 15.9 KB
/
checked.jl
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
# This file is a part of Julia. License is MIT: https://julialang.org/license
# Checked integer arithmetic
import Base: checked_abs, checked_neg, checked_add, checked_sub, checked_mul,
checked_div, checked_rem, checked_fld, checked_mod, checked_cld,
add_with_overflow, sub_with_overflow, mul_with_overflow
# checked operations
@testset for T in (Int8, Int16, Int32, Int64, Int128)
# regular cases
@test checked_abs(T(0)) === T(0)
@test checked_neg(T(0)) === T(0)
@test checked_add(T(0)) === T(0)
@test checked_mul(T(0)) === T(0)
for s in (-1, +1)
@test checked_abs(T(3s)) === T(abs(3s))
@test checked_neg(T(3s)) === T(-3s)
@test checked_add(T(3s)) === T(3s)
@test checked_mul(T(3s)) === T(3s)
@test checked_abs(T(s*typemax(T))) === typemax(T)
@test checked_neg(T(s*typemax(T))) === T(-s*typemax(T))
@test checked_add(T(s*typemax(T))) === T(s*typemax(T))
@test checked_mul(T(s*typemax(T))) === T(s*typemax(T))
end
# corner cases
@test_throws OverflowError checked_abs(typemin(T))
@test_throws OverflowError checked_neg(typemin(T))
# regular cases
for s1 in (-1, +1), s2 in (-1, +1)
@test checked_add(T(4s1), T(3s2)) === T(4s1 + 3s2)
@test checked_sub(T(4s1), T(3s2)) === T(4s1 - 3s2)
@test checked_mul(T(4s1), T(3s2)) === T(4s1 * 3s2)
@test checked_div(T(4s1), T(3s2)) === T(div(4s1, 3s2))
@test checked_rem(T(4s1), T(3s2)) === T(rem(4s1, 3s2))
@test checked_fld(T(4s1), T(3s2)) === T(fld(4s1, 3s2))
@test checked_mod(T(4s1), T(3s2)) === T(mod(4s1, 3s2))
@test checked_cld(T(4s1), T(3s2)) === T(cld(4s1, 3s2))
end
# corner cases
halfmax = T(typemax(T)÷2)
halfmax_plus1 = T(halfmax+1)
halfmin = T(typemin(T)÷2)
halfmin_minus1 = T(halfmin-1)
sqrtmax = T(1) << T(sizeof(T)*4)
half_sqrtmax = sqrtmax >> T(1)
half_sqrtmax_plus1 = half_sqrtmax + T(1)
@test checked_add(typemax(T), T(-1)) === T(typemax(T) - 1)
@test_throws OverflowError checked_add(typemin(T), T(-1))
@test checked_add(typemax(T), T(0)) === typemax(T)
@test checked_add(typemin(T), T(0)) === typemin(T)
@test_throws OverflowError checked_add(typemax(T), T(1))
@test checked_add(typemin(T), T(1)) === T(typemin(T) + 1)
@test checked_add(T(-1), typemax(T)) === T(typemax(T) - 1)
@test_throws OverflowError checked_add(T(-1), typemin(T))
@test checked_add(T(0), typemax(T)) === typemax(T)
@test checked_add(T(0), typemin(T)) === typemin(T)
@test_throws OverflowError checked_add(T(1), typemax(T))
@test checked_add(T(1), typemin(T)) === T(typemin(T) + 1)
@test checked_add(typemax(T), typemin(T)) === T(-1)
@test checked_add(typemin(T), typemax(T)) === T(-1)
@test_throws OverflowError checked_add(halfmax_plus1, halfmax_plus1)
@test_throws OverflowError checked_add(halfmin, halfmin_minus1)
@test add_with_overflow(typemax(T), T(-1)) === (T(typemax(T) - 1), false)
@test add_with_overflow(typemin(T), T(-1)) === (T(typemax(T)), true)
@test add_with_overflow(typemax(T), T(0)) === (typemax(T), false)
@test add_with_overflow(typemin(T), T(0)) === (typemin(T), false)
@test add_with_overflow(typemax(T), T(1)) === (typemin(T), true)
@test add_with_overflow(typemin(T), T(1)) === (T(typemin(T) + 1), false)
@test add_with_overflow(T(-1), typemax(T)) === (T(typemax(T) - 1), false)
@test add_with_overflow(T(-1), typemin(T)) === (typemax(T), true)
@test add_with_overflow(T(0), typemax(T)) === (typemax(T), false)
@test add_with_overflow(T(0), typemin(T)) === (typemin(T), false)
@test add_with_overflow(T(1), typemax(T)) === (typemin(T), true)
@test add_with_overflow(T(1), typemin(T)) === (T(typemin(T) + 1), false)
@test add_with_overflow(typemax(T), typemin(T)) === (T(-1), false)
@test add_with_overflow(typemin(T), typemax(T)) === (T(-1), false)
@test add_with_overflow(halfmax_plus1, halfmax_plus1) === (typemin(T), true)
@test add_with_overflow(halfmin, halfmin_minus1) === (typemax(T), true)
@test_throws OverflowError checked_sub(typemax(T), T(-1))
@test checked_sub(typemax(T), T(0)) === typemax(T)
@test checked_sub(typemax(T), T(1)) === T(typemax(T) - 1)
@test checked_sub(typemin(T), T(-1)) === T(typemin(T) + 1)
@test checked_sub(typemin(T), T(0)) === typemin(T)
@test_throws OverflowError checked_sub(typemin(T), T(1))
@test checked_sub(T(0), typemax(T)) === T(typemin(T) + 1)
@test checked_sub(T(1), typemax(T)) === T(typemin(T) + 2)
@test checked_sub(T(-1), typemin(T)) === typemax(T)
@test_throws OverflowError checked_sub(T(0), typemin(T))
@test checked_sub(typemax(T), typemax(T)) === T(0)
@test checked_sub(typemin(T), typemin(T)) === T(0)
@test checked_sub(halfmax, T(-halfmin)) === T(-1)
@test_throws OverflowError checked_sub(halfmin, T(-halfmin_minus1))
@test sub_with_overflow(typemax(T), T(-1)) === (typemin(T), true)
@test sub_with_overflow(typemax(T), T(0)) === (typemax(T), false)
@test sub_with_overflow(typemax(T), T(1)) === (T(typemax(T) - 1), false)
@test sub_with_overflow(typemin(T), T(-1)) === (T(typemin(T) + 1), false)
@test sub_with_overflow(typemin(T), T(0)) === (typemin(T), false)
@test sub_with_overflow(typemin(T), T(1)) === (typemax(T), true)
@test sub_with_overflow(T(0), typemax(T)) === (T(typemin(T) + 1), false)
@test sub_with_overflow(T(1), typemax(T)) === (T(typemin(T) + 2), false)
@test sub_with_overflow(T(-1), typemin(T)) === (typemax(T), false)
@test sub_with_overflow(T(0), typemin(T)) === (typemin(T), true)
@test sub_with_overflow(typemax(T), typemax(T)) === (T(0), false)
@test sub_with_overflow(typemin(T), typemin(T)) === (T(0), false)
@test sub_with_overflow(halfmax, T(-halfmin)) === (T(-1), false)
@test sub_with_overflow(halfmin, T(-halfmin_minus1)) === (typemax(T), true)
@test checked_mul(typemax(T), T(0)) === T(0)
@test checked_mul(typemin(T), T(0)) === T(0)
@test checked_mul(typemax(T), T(1)) === typemax(T)
@test checked_mul(typemin(T), T(1)) === typemin(T)
@test_throws OverflowError checked_mul(sqrtmax, half_sqrtmax)
@test checked_mul(sqrtmax, -half_sqrtmax) === T(sqrtmax * -half_sqrtmax)
@test_throws OverflowError checked_mul(sqrtmax, -half_sqrtmax_plus1)
@test checked_mul(-sqrtmax, half_sqrtmax) === T(-sqrtmax * half_sqrtmax)
@test_throws OverflowError checked_mul(-sqrtmax, half_sqrtmax_plus1)
@test_throws OverflowError checked_mul(-sqrtmax, -half_sqrtmax)
@test mul_with_overflow(typemax(T), T(0)) === (T(0), false)
@test mul_with_overflow(typemin(T), T(0)) === (T(0), false)
@test mul_with_overflow(typemax(T), T(1)) === (typemax(T), false)
@test mul_with_overflow(typemin(T), T(1)) === (typemin(T), false)
@test mul_with_overflow(sqrtmax, half_sqrtmax) === (typemin(T), true)
@test mul_with_overflow(sqrtmax, -half_sqrtmax) === (T(sqrtmax * -half_sqrtmax), false)
@test mul_with_overflow(sqrtmax, -half_sqrtmax_plus1) === (T(sqrtmax * -half_sqrtmax_plus1), true)
@test mul_with_overflow(-sqrtmax, half_sqrtmax) === (T(-sqrtmax * half_sqrtmax), false)
@test mul_with_overflow(-sqrtmax, half_sqrtmax_plus1) === (T(-sqrtmax * half_sqrtmax_plus1), true)
@test mul_with_overflow(-sqrtmax, -half_sqrtmax) === (T(-sqrtmax * -half_sqrtmax), true)
@test checked_div(typemax(T), T(1)) === typemax(T)
@test_throws DivideError checked_div(typemax(T), T(0))
@test checked_div(typemax(T), T(-1)) === T(-typemax(T))
@test checked_div(typemin(T), T(1)) === typemin(T)
@test_throws DivideError checked_div(typemin(T), T(0))
@test_throws DivideError checked_div(typemin(T), T(-1))
@test checked_rem(typemax(T), T(1)) === T(0)
@test_throws DivideError checked_rem(typemax(T), T(0))
@test checked_rem(typemax(T), T(-1)) === T(0)
@test checked_rem(typemin(T), T(1)) === T(0)
@test_throws DivideError checked_rem(typemin(T), T(0))
@test checked_rem(typemin(T), T(-1)) === T(0)
@test checked_fld(typemax(T), T(1)) === typemax(T)
@test_throws DivideError checked_fld(typemax(T), T(0))
@test checked_fld(typemax(T), T(-1)) === T(-typemax(T))
@test checked_fld(typemin(T), T(1)) === typemin(T)
@test_throws DivideError checked_fld(typemin(T), T(0))
@test_throws DivideError checked_fld(typemin(T), T(-1))
@test checked_mod(typemax(T), T(1)) === T(0)
@test_throws DivideError checked_mod(typemax(T), T(0))
@test checked_mod(typemax(T), T(-1)) === T(0)
@test checked_mod(typemin(T), T(1)) === T(0)
@test_throws DivideError checked_mod(typemin(T), T(0))
@test checked_mod(typemin(T), T(-1)) === T(0)
@test_throws DivideError checked_cld(typemax(T), T(0))
@test checked_cld(typemax(T), T(-1)) === T(-typemax(T))
@test checked_cld(typemin(T), T(1)) === typemin(T)
@test_throws DivideError checked_cld(typemin(T), T(0))
@test_throws DivideError checked_cld(typemin(T), T(-1))
end
@testset for T in (UInt8, UInt16, UInt32, UInt64, UInt128)
# regular cases
@test checked_abs(T(0)) === T(0)
@test checked_neg(T(0)) === T(0)
@test checked_add(T(0)) === T(0)
@test checked_mul(T(0)) === T(0)
@test checked_abs(T(3)) === T(3)
@test_throws OverflowError checked_neg(T(3))
@test checked_add(T(3)) === T(3)
@test checked_mul(T(3)) === T(3)
# regular cases
@test checked_add(T(4), T(3)) === T(7)
@test checked_sub(T(4), T(3)) === T(1)
@test checked_mul(T(4), T(3)) === T(12)
# corner cases
halfmax = T(typemax(T)÷2)
halfmax_plus1 = T(halfmax+1)
sqrtmax = T(1) << T(sizeof(T)*4)
@test checked_add(typemax(T), T(0)) === typemax(T)
@test checked_add(T(0), T(0)) === T(0)
@test_throws OverflowError checked_add(typemax(T), T(1))
@test checked_add(T(0), T(1)) === T(T(0) + 1)
@test checked_add(T(0), typemax(T)) === typemax(T)
@test checked_add(T(0), T(0)) === T(0)
@test_throws OverflowError checked_add(T(1), typemax(T))
@test checked_add(T(1), T(0)) === T(T(0) + 1)
@test checked_add(typemax(T), T(0)) === typemax(T)
@test checked_add(T(0), typemax(T)) === typemax(T)
@test_throws OverflowError checked_add(halfmax_plus1, halfmax_plus1)
@test add_with_overflow(typemax(T), T(0)) === (typemax(T), false)
@test add_with_overflow(T(0), T(0)) === (T(0), false)
@test add_with_overflow(typemax(T), T(1)) === (T(0), true)
@test add_with_overflow(T(0), T(1)) === (T(T(0) + 1), false)
@test add_with_overflow(T(0), typemax(T)) === (typemax(T), false)
@test add_with_overflow(T(0), T(0)) === (T(0), false)
@test add_with_overflow(T(1), typemax(T)) === (T(0), true)
@test add_with_overflow(T(1), T(0)) === (T(T(0) + 1), false)
@test add_with_overflow(typemax(T), T(0)) === (typemax(T), false)
@test add_with_overflow(T(0), typemax(T)) === (typemax(T), false)
@test add_with_overflow(halfmax_plus1, halfmax_plus1) === (T(0), true)
@test checked_sub(typemax(T), T(0)) === typemax(T)
@test checked_sub(typemax(T), T(1)) === T(typemax(T) - 1)
@test checked_sub(T(0), T(0)) === T(0)
@test_throws OverflowError checked_sub(T(0), T(1))
@test_throws OverflowError checked_sub(T(0), typemax(T))
@test_throws OverflowError checked_sub(T(1), typemax(T))
@test checked_sub(T(0), T(0)) === T(0)
@test checked_sub(typemax(T), typemax(T)) === T(0)
@test sub_with_overflow(typemax(T), T(0)) === (typemax(T), false)
@test sub_with_overflow(typemax(T), T(1)) === (T(typemax(T) - 1), false)
@test sub_with_overflow(T(0), T(0)) === (T(0), false)
@test sub_with_overflow(T(0), T(1)) === (typemax(T), true)
@test sub_with_overflow(T(0), typemax(T)) === (T(1), true)
@test sub_with_overflow(T(1), typemax(T)) === (T(2), true)
@test sub_with_overflow(T(0), T(0)) === (T(0), false)
@test sub_with_overflow(typemax(T), typemax(T)) === (T(0), false)
@test checked_mul(typemax(T), T(0)) === T(0)
@test checked_mul(T(0), T(0)) === T(0)
@test checked_mul(typemax(T), T(1)) === typemax(T)
@test checked_mul(T(0), T(1)) === T(0)
@test_throws OverflowError checked_mul(sqrtmax, sqrtmax)
@test mul_with_overflow(typemax(T), T(0)) === (T(0), false)
@test mul_with_overflow(T(0), T(0)) === (T(0), false)
@test mul_with_overflow(typemax(T), T(1)) === (typemax(T), false)
@test mul_with_overflow(T(0), T(1)) === (T(0), false)
@test mul_with_overflow(sqrtmax, sqrtmax) === (T(0), true)
@test checked_div(typemax(T), T(1)) === typemax(T)
@test_throws DivideError checked_div(typemax(T), T(0))
@test checked_rem(typemax(T), T(1)) === T(0)
@test_throws DivideError checked_rem(typemax(T), T(0))
@test checked_fld(typemax(T), T(1)) === typemax(T)
@test_throws DivideError checked_fld(typemax(T), T(0))
@test checked_mod(typemax(T), T(1)) === T(0)
@test_throws DivideError checked_mod(typemax(T), T(0))
@test checked_cld(typemax(T), T(1)) === typemax(T)
@test_throws DivideError checked_cld(typemax(T), T(0))
end
@testset "Boolean" begin
@test checked_add(false) === 0
@test checked_add(true) === 1
@test checked_neg(false) === 0
@test checked_neg(true) === -1
@test checked_abs(true) === true
@test checked_abs(false) === false
@test checked_mul(false) === false
@test checked_mul(true) === true
@test checked_add(true, true) === 2
@test checked_add(true, false) === 1
@test checked_add(false, false) === 0
@test checked_add(false, true) === 1
@test checked_sub(true, true) === 0
@test checked_sub(true, false) === 1
@test checked_sub(false, false) === 0
@test checked_sub(false, true) === -1
@test checked_mul(true, false) === false
@test checked_mul(false, false) === false
@test checked_mul(true, true) === true
@test checked_mul(false, true) === false
@test checked_div(true, true) === true
@test checked_div(false, true) === false
@test_throws DivideError checked_div(true, false)
@test checked_rem(true, true) === false
@test checked_rem(false, true) === false
@test_throws DivideError checked_rem(true, false)
@test checked_fld(true, true) === true
@test checked_fld(false, true) === false
@test_throws DivideError checked_fld(true, false)
@test checked_mod(true, true) === false
@test checked_mod(false, true) === false
@test_throws DivideError checked_mod(true, false)
@test checked_cld(true, true) === true
@test checked_cld(false, true) === false
@test_throws DivideError checked_cld(true, false)
end
@testset "BigInt" begin
@test checked_abs(BigInt(-1)) == BigInt(1)
@test checked_abs(BigInt(1)) == BigInt(1)
@test checked_neg(BigInt(-1)) == BigInt(1)
@test checked_neg(BigInt(1)) == BigInt(-1)
end
@testset "Additional tests" begin
# test promotions
@test checked_add(UInt(4), UInt8(3)) === UInt(7)
@test checked_sub(UInt(4), UInt8(3)) === UInt(1)
@test checked_mul(UInt(4), UInt8(3)) === UInt(12)
@test checked_div(UInt(4), UInt8(2)) === UInt(2)
@test checked_mod(UInt(4), UInt8(2)) === UInt(0)
@test checked_rem(UInt(5), UInt8(2)) === UInt(1)
@test checked_fld(UInt(5), UInt8(1)) === UInt(5)
@test checked_cld(UInt(5), UInt8(1)) === UInt(5)
@test checked_sub(UInt(4), UInt(3)) === UInt(1)
@test_throws OverflowError checked_sub(UInt(5), UInt(6))
@test checked_mul(UInt(4), UInt(3)) === UInt(12)
@test checked_sub(Int128(-1),Int128(-2)) === Int128(1)
@test_throws OverflowError checked_mul(UInt32(2)^30, UInt32(2)^2)
@test_throws OverflowError checked_mul(UInt64(2)^62, UInt64(2)^2)
@test checked_add(UInt128(1), UInt128(2)) === UInt128(3)
@test_throws OverflowError checked_add(UInt128(2)^127, UInt128(2)^127)
@test checked_sub(UInt128(2), UInt128(1)) === UInt128(1)
@test_throws OverflowError checked_sub(UInt128(3), UInt128(4))
@test checked_mul(UInt128(3), UInt128(4)) === UInt128(12)
@test_throws OverflowError checked_mul(UInt128(2)^127, UInt128(2))
end