Fix APInt value initialization to give a zero value as any sane integer type
[oota-llvm.git] / unittests / ADT / APIntTest.cpp
1 //===- llvm/unittest/ADT/APInt.cpp - APInt unit tests ---------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/ADT/APInt.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "gtest/gtest.h"
13 #include <array>
14 #include <ostream>
15
16 using namespace llvm;
17
18 namespace {
19
20 TEST(APIntTest, ValueInit) {
21   APInt Zero = APInt();
22   EXPECT_TRUE(!Zero);
23   EXPECT_TRUE(!Zero.zext(64));
24   EXPECT_TRUE(!Zero.sext(64));
25 }
26
27 // Test that APInt shift left works when bitwidth > 64 and shiftamt == 0
28 TEST(APIntTest, ShiftLeftByZero) {
29   APInt One = APInt::getNullValue(65) + 1;
30   APInt Shl = One.shl(0);
31   EXPECT_TRUE(Shl[0]);
32   EXPECT_FALSE(Shl[1]);
33 }
34
35 TEST(APIntTest, i128_NegativeCount) {
36   APInt Minus3(128, static_cast<uint64_t>(-3), true);
37   EXPECT_EQ(126u, Minus3.countLeadingOnes());
38   EXPECT_EQ(-3, Minus3.getSExtValue());
39
40   APInt Minus1(128, static_cast<uint64_t>(-1), true);
41   EXPECT_EQ(0u, Minus1.countLeadingZeros());
42   EXPECT_EQ(128u, Minus1.countLeadingOnes());
43   EXPECT_EQ(128u, Minus1.getActiveBits());
44   EXPECT_EQ(0u, Minus1.countTrailingZeros());
45   EXPECT_EQ(128u, Minus1.countTrailingOnes());
46   EXPECT_EQ(128u, Minus1.countPopulation());
47   EXPECT_EQ(-1, Minus1.getSExtValue());
48 }
49
50 // XFAIL this test on FreeBSD where the system gcc-4.2.1 seems to miscompile it.
51 #if defined(__llvm__) || !defined(__FreeBSD__)
52
53 TEST(APIntTest, i33_Count) {
54   APInt i33minus2(33, static_cast<uint64_t>(-2), true);
55   EXPECT_EQ(0u, i33minus2.countLeadingZeros());
56   EXPECT_EQ(32u, i33minus2.countLeadingOnes());
57   EXPECT_EQ(33u, i33minus2.getActiveBits());
58   EXPECT_EQ(1u, i33minus2.countTrailingZeros());
59   EXPECT_EQ(32u, i33minus2.countPopulation());
60   EXPECT_EQ(-2, i33minus2.getSExtValue());
61   EXPECT_EQ(((uint64_t)-2)&((1ull<<33) -1), i33minus2.getZExtValue());
62 }
63
64 #endif
65
66 TEST(APIntTest, i65_Count) {
67   APInt i65(65, 0, true);
68   EXPECT_EQ(65u, i65.countLeadingZeros());
69   EXPECT_EQ(0u, i65.countLeadingOnes());
70   EXPECT_EQ(0u, i65.getActiveBits());
71   EXPECT_EQ(1u, i65.getActiveWords());
72   EXPECT_EQ(65u, i65.countTrailingZeros());
73   EXPECT_EQ(0u, i65.countPopulation());
74
75   APInt i65minus(65, 0, true);
76   i65minus.setBit(64);
77   EXPECT_EQ(0u, i65minus.countLeadingZeros());
78   EXPECT_EQ(1u, i65minus.countLeadingOnes());
79   EXPECT_EQ(65u, i65minus.getActiveBits());
80   EXPECT_EQ(64u, i65minus.countTrailingZeros());
81   EXPECT_EQ(1u, i65minus.countPopulation());
82 }
83
84 TEST(APIntTest, i128_PositiveCount) {
85   APInt u128max = APInt::getAllOnesValue(128);
86   EXPECT_EQ(128u, u128max.countLeadingOnes());
87   EXPECT_EQ(0u, u128max.countLeadingZeros());
88   EXPECT_EQ(128u, u128max.getActiveBits());
89   EXPECT_EQ(0u, u128max.countTrailingZeros());
90   EXPECT_EQ(128u, u128max.countTrailingOnes());
91   EXPECT_EQ(128u, u128max.countPopulation());
92
93   APInt u64max(128, static_cast<uint64_t>(-1), false);
94   EXPECT_EQ(64u, u64max.countLeadingZeros());
95   EXPECT_EQ(0u, u64max.countLeadingOnes());
96   EXPECT_EQ(64u, u64max.getActiveBits());
97   EXPECT_EQ(0u, u64max.countTrailingZeros());
98   EXPECT_EQ(64u, u64max.countTrailingOnes());
99   EXPECT_EQ(64u, u64max.countPopulation());
100   EXPECT_EQ((uint64_t)~0ull, u64max.getZExtValue());
101
102   APInt zero(128, 0, true);
103   EXPECT_EQ(128u, zero.countLeadingZeros());
104   EXPECT_EQ(0u, zero.countLeadingOnes());
105   EXPECT_EQ(0u, zero.getActiveBits());
106   EXPECT_EQ(128u, zero.countTrailingZeros());
107   EXPECT_EQ(0u, zero.countTrailingOnes());
108   EXPECT_EQ(0u, zero.countPopulation());
109   EXPECT_EQ(0u, zero.getSExtValue());
110   EXPECT_EQ(0u, zero.getZExtValue());
111
112   APInt one(128, 1, true);
113   EXPECT_EQ(127u, one.countLeadingZeros());
114   EXPECT_EQ(0u, one.countLeadingOnes());
115   EXPECT_EQ(1u, one.getActiveBits());
116   EXPECT_EQ(0u, one.countTrailingZeros());
117   EXPECT_EQ(1u, one.countTrailingOnes());
118   EXPECT_EQ(1u, one.countPopulation());
119   EXPECT_EQ(1, one.getSExtValue());
120   EXPECT_EQ(1u, one.getZExtValue());
121 }
122
123 TEST(APIntTest, i1) {
124   const APInt neg_two(1, static_cast<uint64_t>(-2), true);
125   const APInt neg_one(1, static_cast<uint64_t>(-1), true);
126   const APInt zero(1, 0);
127   const APInt one(1, 1);
128   const APInt two(1, 2);
129
130   EXPECT_EQ(0, neg_two.getSExtValue());
131   EXPECT_EQ(-1, neg_one.getSExtValue());
132   EXPECT_EQ(1u, neg_one.getZExtValue());
133   EXPECT_EQ(0u, zero.getZExtValue());
134   EXPECT_EQ(-1, one.getSExtValue());
135   EXPECT_EQ(1u, one.getZExtValue());
136   EXPECT_EQ(0u, two.getZExtValue());
137   EXPECT_EQ(0, two.getSExtValue());
138
139   // Basic equalities for 1-bit values.
140   EXPECT_EQ(zero, two);
141   EXPECT_EQ(zero, neg_two);
142   EXPECT_EQ(one, neg_one);
143   EXPECT_EQ(two, neg_two);
144
145   // Min/max signed values.
146   EXPECT_TRUE(zero.isMaxSignedValue());
147   EXPECT_FALSE(one.isMaxSignedValue());
148   EXPECT_FALSE(zero.isMinSignedValue());
149   EXPECT_TRUE(one.isMinSignedValue());
150
151   // Additions.
152   EXPECT_EQ(two, one + one);
153   EXPECT_EQ(zero, neg_one + one);
154   EXPECT_EQ(neg_two, neg_one + neg_one);
155
156   // Subtractions.
157   EXPECT_EQ(neg_two, neg_one - one);
158   EXPECT_EQ(two, one - neg_one);
159   EXPECT_EQ(zero, one - one);
160
161   // Shifts.
162   EXPECT_EQ(zero, one << one);
163   EXPECT_EQ(one, one << zero);
164   EXPECT_EQ(zero, one.shl(1));
165   EXPECT_EQ(one, one.shl(0));
166   EXPECT_EQ(zero, one.lshr(1));
167   EXPECT_EQ(zero, one.ashr(1));
168
169   // Rotates.
170   EXPECT_EQ(one, one.rotl(0));
171   EXPECT_EQ(one, one.rotl(1));
172   EXPECT_EQ(one, one.rotr(0));
173   EXPECT_EQ(one, one.rotr(1));
174
175   // Multiplies.
176   EXPECT_EQ(neg_one, neg_one * one);
177   EXPECT_EQ(neg_one, one * neg_one);
178   EXPECT_EQ(one, neg_one * neg_one);
179   EXPECT_EQ(one, one * one);
180
181   // Divides.
182   EXPECT_EQ(neg_one, one.sdiv(neg_one));
183   EXPECT_EQ(neg_one, neg_one.sdiv(one));
184   EXPECT_EQ(one, neg_one.sdiv(neg_one));
185   EXPECT_EQ(one, one.sdiv(one));
186
187   EXPECT_EQ(neg_one, one.udiv(neg_one));
188   EXPECT_EQ(neg_one, neg_one.udiv(one));
189   EXPECT_EQ(one, neg_one.udiv(neg_one));
190   EXPECT_EQ(one, one.udiv(one));
191
192   // Remainders.
193   EXPECT_EQ(zero, neg_one.srem(one));
194   EXPECT_EQ(zero, neg_one.urem(one));
195   EXPECT_EQ(zero, one.srem(neg_one));
196
197   // sdivrem
198   {
199   APInt q(8, 0);
200   APInt r(8, 0);
201   APInt one(8, 1);
202   APInt two(8, 2);
203   APInt nine(8, 9);
204   APInt four(8, 4);
205
206   EXPECT_EQ(nine.srem(two), one);
207   EXPECT_EQ(nine.srem(-two), one);
208   EXPECT_EQ((-nine).srem(two), -one);
209   EXPECT_EQ((-nine).srem(-two), -one);
210
211   APInt::sdivrem(nine, two, q, r);
212   EXPECT_EQ(four, q);
213   EXPECT_EQ(one, r);
214   APInt::sdivrem(-nine, two, q, r);
215   EXPECT_EQ(-four, q);
216   EXPECT_EQ(-one, r);
217   APInt::sdivrem(nine, -two, q, r);
218   EXPECT_EQ(-four, q);
219   EXPECT_EQ(one, r);
220   APInt::sdivrem(-nine, -two, q, r);
221   EXPECT_EQ(four, q);
222   EXPECT_EQ(-one, r);
223   }
224 }
225
226 TEST(APIntTest, compare) {
227   std::array<APInt, 5> testVals{{
228     APInt{16, 2},
229     APInt{16, 1},
230     APInt{16, 0},
231     APInt{16, (uint64_t)-1, true},
232     APInt{16, (uint64_t)-2, true},
233   }};
234
235   for (auto &arg1 : testVals)
236     for (auto &arg2 : testVals) {
237       auto uv1 = arg1.getZExtValue();
238       auto uv2 = arg2.getZExtValue();
239       auto sv1 = arg1.getSExtValue();
240       auto sv2 = arg2.getSExtValue();
241
242       EXPECT_EQ(uv1 <  uv2, arg1.ult(arg2));
243       EXPECT_EQ(uv1 <= uv2, arg1.ule(arg2));
244       EXPECT_EQ(uv1 >  uv2, arg1.ugt(arg2));
245       EXPECT_EQ(uv1 >= uv2, arg1.uge(arg2));
246
247       EXPECT_EQ(sv1 <  sv2, arg1.slt(arg2));
248       EXPECT_EQ(sv1 <= sv2, arg1.sle(arg2));
249       EXPECT_EQ(sv1 >  sv2, arg1.sgt(arg2));
250       EXPECT_EQ(sv1 >= sv2, arg1.sge(arg2));
251
252       EXPECT_EQ(uv1 <  uv2, arg1.ult(uv2));
253       EXPECT_EQ(uv1 <= uv2, arg1.ule(uv2));
254       EXPECT_EQ(uv1 >  uv2, arg1.ugt(uv2));
255       EXPECT_EQ(uv1 >= uv2, arg1.uge(uv2));
256
257       EXPECT_EQ(sv1 <  sv2, arg1.slt(sv2));
258       EXPECT_EQ(sv1 <= sv2, arg1.sle(sv2));
259       EXPECT_EQ(sv1 >  sv2, arg1.sgt(sv2));
260       EXPECT_EQ(sv1 >= sv2, arg1.sge(sv2));
261     }
262 }
263
264 TEST(APIntTest, compareWithRawIntegers) {
265   EXPECT_TRUE(!APInt(8, 1).uge(256));
266   EXPECT_TRUE(!APInt(8, 1).ugt(256));
267   EXPECT_TRUE( APInt(8, 1).ule(256));
268   EXPECT_TRUE( APInt(8, 1).ult(256));
269   EXPECT_TRUE(!APInt(8, 1).sge(256));
270   EXPECT_TRUE(!APInt(8, 1).sgt(256));
271   EXPECT_TRUE( APInt(8, 1).sle(256));
272   EXPECT_TRUE( APInt(8, 1).slt(256));
273   EXPECT_TRUE(!(APInt(8, 0) == 256));
274   EXPECT_TRUE(  APInt(8, 0) != 256);
275   EXPECT_TRUE(!(APInt(8, 1) == 256));
276   EXPECT_TRUE(  APInt(8, 1) != 256);
277
278   auto uint64max = UINT64_MAX;
279   auto int64max  = INT64_MAX;
280   auto int64min  = INT64_MIN;
281
282   auto u64 = APInt{128, uint64max};
283   auto s64 = APInt{128, static_cast<uint64_t>(int64max), true};
284   auto big = u64 + 1;
285
286   EXPECT_TRUE( u64.uge(uint64max));
287   EXPECT_TRUE(!u64.ugt(uint64max));
288   EXPECT_TRUE( u64.ule(uint64max));
289   EXPECT_TRUE(!u64.ult(uint64max));
290   EXPECT_TRUE( u64.sge(int64max));
291   EXPECT_TRUE( u64.sgt(int64max));
292   EXPECT_TRUE(!u64.sle(int64max));
293   EXPECT_TRUE(!u64.slt(int64max));
294   EXPECT_TRUE( u64.sge(int64min));
295   EXPECT_TRUE( u64.sgt(int64min));
296   EXPECT_TRUE(!u64.sle(int64min));
297   EXPECT_TRUE(!u64.slt(int64min));
298
299   EXPECT_TRUE(u64 == uint64max);
300   EXPECT_TRUE(u64 != int64max);
301   EXPECT_TRUE(u64 != int64min);
302
303   EXPECT_TRUE(!s64.uge(uint64max));
304   EXPECT_TRUE(!s64.ugt(uint64max));
305   EXPECT_TRUE( s64.ule(uint64max));
306   EXPECT_TRUE( s64.ult(uint64max));
307   EXPECT_TRUE( s64.sge(int64max));
308   EXPECT_TRUE(!s64.sgt(int64max));
309   EXPECT_TRUE( s64.sle(int64max));
310   EXPECT_TRUE(!s64.slt(int64max));
311   EXPECT_TRUE( s64.sge(int64min));
312   EXPECT_TRUE( s64.sgt(int64min));
313   EXPECT_TRUE(!s64.sle(int64min));
314   EXPECT_TRUE(!s64.slt(int64min));
315
316   EXPECT_TRUE(s64 != uint64max);
317   EXPECT_TRUE(s64 == int64max);
318   EXPECT_TRUE(s64 != int64min);
319
320   EXPECT_TRUE( big.uge(uint64max));
321   EXPECT_TRUE( big.ugt(uint64max));
322   EXPECT_TRUE(!big.ule(uint64max));
323   EXPECT_TRUE(!big.ult(uint64max));
324   EXPECT_TRUE( big.sge(int64max));
325   EXPECT_TRUE( big.sgt(int64max));
326   EXPECT_TRUE(!big.sle(int64max));
327   EXPECT_TRUE(!big.slt(int64max));
328   EXPECT_TRUE( big.sge(int64min));
329   EXPECT_TRUE( big.sgt(int64min));
330   EXPECT_TRUE(!big.sle(int64min));
331   EXPECT_TRUE(!big.slt(int64min));
332
333   EXPECT_TRUE(big != uint64max);
334   EXPECT_TRUE(big != int64max);
335   EXPECT_TRUE(big != int64min);
336 }
337
338 TEST(APIntTest, compareWithInt64Min) {
339   int64_t edge = INT64_MIN;
340   int64_t edgeP1 = edge + 1;
341   int64_t edgeM1 = INT64_MAX;
342   auto a = APInt{64, static_cast<uint64_t>(edge), true};
343
344   EXPECT_TRUE(!a.slt(edge));
345   EXPECT_TRUE( a.sle(edge));
346   EXPECT_TRUE(!a.sgt(edge));
347   EXPECT_TRUE( a.sge(edge));
348   EXPECT_TRUE( a.slt(edgeP1));
349   EXPECT_TRUE( a.sle(edgeP1));
350   EXPECT_TRUE(!a.sgt(edgeP1));
351   EXPECT_TRUE(!a.sge(edgeP1));
352   EXPECT_TRUE( a.slt(edgeM1));
353   EXPECT_TRUE( a.sle(edgeM1));
354   EXPECT_TRUE(!a.sgt(edgeM1));
355   EXPECT_TRUE(!a.sge(edgeM1));
356 }
357
358 TEST(APIntTest, compareWithHalfInt64Max) {
359   uint64_t edge = 0x4000000000000000;
360   uint64_t edgeP1 = edge + 1;
361   uint64_t edgeM1 = edge - 1;
362   auto a = APInt{64, edge};
363
364   EXPECT_TRUE(!a.ult(edge));
365   EXPECT_TRUE( a.ule(edge));
366   EXPECT_TRUE(!a.ugt(edge));
367   EXPECT_TRUE( a.uge(edge));
368   EXPECT_TRUE( a.ult(edgeP1));
369   EXPECT_TRUE( a.ule(edgeP1));
370   EXPECT_TRUE(!a.ugt(edgeP1));
371   EXPECT_TRUE(!a.uge(edgeP1));
372   EXPECT_TRUE(!a.ult(edgeM1));
373   EXPECT_TRUE(!a.ule(edgeM1));
374   EXPECT_TRUE( a.ugt(edgeM1));
375   EXPECT_TRUE( a.uge(edgeM1));
376
377   EXPECT_TRUE(!a.slt(edge));
378   EXPECT_TRUE( a.sle(edge));
379   EXPECT_TRUE(!a.sgt(edge));
380   EXPECT_TRUE( a.sge(edge));
381   EXPECT_TRUE( a.slt(edgeP1));
382   EXPECT_TRUE( a.sle(edgeP1));
383   EXPECT_TRUE(!a.sgt(edgeP1));
384   EXPECT_TRUE(!a.sge(edgeP1));
385   EXPECT_TRUE(!a.slt(edgeM1));
386   EXPECT_TRUE(!a.sle(edgeM1));
387   EXPECT_TRUE( a.sgt(edgeM1));
388   EXPECT_TRUE( a.sge(edgeM1));
389 }
390
391
392 // Tests different div/rem varaints using scheme (a * b + c) / a
393 void testDiv(APInt a, APInt b, APInt c) {
394   ASSERT_TRUE(a.uge(b)); // Must: a >= b
395   ASSERT_TRUE(a.ugt(c)); // Must: a > c
396
397   auto p = a * b + c;
398
399   auto q = p.udiv(a);
400   auto r = p.urem(a);
401   EXPECT_EQ(b, q);
402   EXPECT_EQ(c, r);
403   APInt::udivrem(p, a, q, r);
404   EXPECT_EQ(b, q);
405   EXPECT_EQ(c, r);
406   q = p.sdiv(a);
407   r = p.srem(a);
408   EXPECT_EQ(b, q);
409   EXPECT_EQ(c, r);
410   APInt::sdivrem(p, a, q, r);
411   EXPECT_EQ(b, q);
412   EXPECT_EQ(c, r);
413
414   if (b.ugt(c)) { // Test also symmetric case
415     q = p.udiv(b);
416     r = p.urem(b);
417     EXPECT_EQ(a, q);
418     EXPECT_EQ(c, r);
419     APInt::udivrem(p, b, q, r);
420     EXPECT_EQ(a, q);
421     EXPECT_EQ(c, r);
422     q = p.sdiv(b);
423     r = p.srem(b);
424     EXPECT_EQ(a, q);
425     EXPECT_EQ(c, r);
426     APInt::sdivrem(p, b, q, r);
427     EXPECT_EQ(a, q);
428     EXPECT_EQ(c, r);
429   }
430 }
431
432 TEST(APIntTest, divrem_big1) {
433   // Tests KnuthDiv rare step D6
434   testDiv({256, "1ffffffffffffffff", 16},
435           {256, "1ffffffffffffffff", 16},
436           {256, 0});
437 }
438
439 TEST(APIntTest, divrem_big2) {
440   // Tests KnuthDiv rare step D6
441   testDiv({1024,                       "112233ceff"
442                  "cecece000000ffffffffffffffffffff"
443                  "ffffffffffffffffffffffffffffffff"
444                  "ffffffffffffffffffffffffffffffff"
445                  "ffffffffffffffffffffffffffffff33", 16},
446           {1024,           "111111ffffffffffffffff"
447                  "ffffffffffffffffffffffffffffffff"
448                  "fffffffffffffffffffffffffffffccf"
449                  "ffffffffffffffffffffffffffffff00", 16},
450           {1024, 7919});
451 }
452
453 TEST(APIntTest, divrem_big3) {
454   // Tests KnuthDiv case without shift
455   testDiv({256, "80000001ffffffffffffffff", 16},
456           {256, "ffffffffffffff0000000", 16},
457           {256, 4219});
458 }
459
460 TEST(APIntTest, divrem_big4) {
461   // Tests heap allocation in divide() enfoced by huge numbers
462   testDiv(APInt{4096, 5}.shl(2001),
463           APInt{4096, 1}.shl(2000),
464           APInt{4096, 4219*13});
465 }
466
467 TEST(APIntTest, divrem_big5) {
468   // Tests one word divisor case of divide()
469   testDiv(APInt{1024, 19}.shl(811),
470           APInt{1024, 4356013}, // one word
471           APInt{1024, 1});
472 }
473
474 TEST(APIntTest, divrem_big6) {
475   // Tests some rare "borrow" cases in D4 step
476   testDiv(APInt{512, "ffffffffffffffff00000000000000000000000001", 16},
477           APInt{512, "10000000000000001000000000000001", 16},
478           APInt{512, "10000000000000000000000000000000", 16});
479 }
480
481 TEST(APIntTest, divrem_big7) {
482   // Yet another test for KnuthDiv rare step D6.
483   testDiv({224, "800000008000000200000005", 16},
484           {224, "fffffffd", 16},
485           {224, "80000000800000010000000f", 16});
486 }
487
488 TEST(APIntTest, fromString) {
489   EXPECT_EQ(APInt(32, 0), APInt(32,   "0", 2));
490   EXPECT_EQ(APInt(32, 1), APInt(32,   "1", 2));
491   EXPECT_EQ(APInt(32, 2), APInt(32,  "10", 2));
492   EXPECT_EQ(APInt(32, 3), APInt(32,  "11", 2));
493   EXPECT_EQ(APInt(32, 4), APInt(32, "100", 2));
494
495   EXPECT_EQ(APInt(32, 0), APInt(32,   "+0", 2));
496   EXPECT_EQ(APInt(32, 1), APInt(32,   "+1", 2));
497   EXPECT_EQ(APInt(32, 2), APInt(32,  "+10", 2));
498   EXPECT_EQ(APInt(32, 3), APInt(32,  "+11", 2));
499   EXPECT_EQ(APInt(32, 4), APInt(32, "+100", 2));
500
501   EXPECT_EQ(APInt(32, uint64_t(-0LL)), APInt(32,   "-0", 2));
502   EXPECT_EQ(APInt(32, uint64_t(-1LL)), APInt(32,   "-1", 2));
503   EXPECT_EQ(APInt(32, uint64_t(-2LL)), APInt(32,  "-10", 2));
504   EXPECT_EQ(APInt(32, uint64_t(-3LL)), APInt(32,  "-11", 2));
505   EXPECT_EQ(APInt(32, uint64_t(-4LL)), APInt(32, "-100", 2));
506
507
508   EXPECT_EQ(APInt(32,  0), APInt(32,  "0",  8));
509   EXPECT_EQ(APInt(32,  1), APInt(32,  "1",  8));
510   EXPECT_EQ(APInt(32,  7), APInt(32,  "7",  8));
511   EXPECT_EQ(APInt(32,  8), APInt(32,  "10", 8));
512   EXPECT_EQ(APInt(32, 15), APInt(32,  "17", 8));
513   EXPECT_EQ(APInt(32, 16), APInt(32,  "20", 8));
514
515   EXPECT_EQ(APInt(32,  +0), APInt(32,  "+0",  8));
516   EXPECT_EQ(APInt(32,  +1), APInt(32,  "+1",  8));
517   EXPECT_EQ(APInt(32,  +7), APInt(32,  "+7",  8));
518   EXPECT_EQ(APInt(32,  +8), APInt(32,  "+10", 8));
519   EXPECT_EQ(APInt(32, +15), APInt(32,  "+17", 8));
520   EXPECT_EQ(APInt(32, +16), APInt(32,  "+20", 8));
521
522   EXPECT_EQ(APInt(32,  uint64_t(-0LL)), APInt(32,  "-0",  8));
523   EXPECT_EQ(APInt(32,  uint64_t(-1LL)), APInt(32,  "-1",  8));
524   EXPECT_EQ(APInt(32,  uint64_t(-7LL)), APInt(32,  "-7",  8));
525   EXPECT_EQ(APInt(32,  uint64_t(-8LL)), APInt(32,  "-10", 8));
526   EXPECT_EQ(APInt(32, uint64_t(-15LL)), APInt(32,  "-17", 8));
527   EXPECT_EQ(APInt(32, uint64_t(-16LL)), APInt(32,  "-20", 8));
528
529
530   EXPECT_EQ(APInt(32,  0), APInt(32,  "0", 10));
531   EXPECT_EQ(APInt(32,  1), APInt(32,  "1", 10));
532   EXPECT_EQ(APInt(32,  9), APInt(32,  "9", 10));
533   EXPECT_EQ(APInt(32, 10), APInt(32, "10", 10));
534   EXPECT_EQ(APInt(32, 19), APInt(32, "19", 10));
535   EXPECT_EQ(APInt(32, 20), APInt(32, "20", 10));
536
537   EXPECT_EQ(APInt(32,  uint64_t(-0LL)), APInt(32,  "-0", 10));
538   EXPECT_EQ(APInt(32,  uint64_t(-1LL)), APInt(32,  "-1", 10));
539   EXPECT_EQ(APInt(32,  uint64_t(-9LL)), APInt(32,  "-9", 10));
540   EXPECT_EQ(APInt(32, uint64_t(-10LL)), APInt(32, "-10", 10));
541   EXPECT_EQ(APInt(32, uint64_t(-19LL)), APInt(32, "-19", 10));
542   EXPECT_EQ(APInt(32, uint64_t(-20LL)), APInt(32, "-20", 10));
543
544
545   EXPECT_EQ(APInt(32,  0), APInt(32,  "0", 16));
546   EXPECT_EQ(APInt(32,  1), APInt(32,  "1", 16));
547   EXPECT_EQ(APInt(32, 15), APInt(32,  "F", 16));
548   EXPECT_EQ(APInt(32, 16), APInt(32, "10", 16));
549   EXPECT_EQ(APInt(32, 31), APInt(32, "1F", 16));
550   EXPECT_EQ(APInt(32, 32), APInt(32, "20", 16));
551
552   EXPECT_EQ(APInt(32,  uint64_t(-0LL)), APInt(32,  "-0", 16));
553   EXPECT_EQ(APInt(32,  uint64_t(-1LL)), APInt(32,  "-1", 16));
554   EXPECT_EQ(APInt(32, uint64_t(-15LL)), APInt(32,  "-F", 16));
555   EXPECT_EQ(APInt(32, uint64_t(-16LL)), APInt(32, "-10", 16));
556   EXPECT_EQ(APInt(32, uint64_t(-31LL)), APInt(32, "-1F", 16));
557   EXPECT_EQ(APInt(32, uint64_t(-32LL)), APInt(32, "-20", 16));
558
559   EXPECT_EQ(APInt(32,  0), APInt(32,  "0", 36));
560   EXPECT_EQ(APInt(32,  1), APInt(32,  "1", 36));
561   EXPECT_EQ(APInt(32, 35), APInt(32,  "Z", 36));
562   EXPECT_EQ(APInt(32, 36), APInt(32, "10", 36));
563   EXPECT_EQ(APInt(32, 71), APInt(32, "1Z", 36));
564   EXPECT_EQ(APInt(32, 72), APInt(32, "20", 36));
565   
566   EXPECT_EQ(APInt(32,  uint64_t(-0LL)), APInt(32,  "-0", 36));
567   EXPECT_EQ(APInt(32,  uint64_t(-1LL)), APInt(32,  "-1", 36));
568   EXPECT_EQ(APInt(32, uint64_t(-35LL)), APInt(32,  "-Z", 36));
569   EXPECT_EQ(APInt(32, uint64_t(-36LL)), APInt(32, "-10", 36));
570   EXPECT_EQ(APInt(32, uint64_t(-71LL)), APInt(32, "-1Z", 36));
571   EXPECT_EQ(APInt(32, uint64_t(-72LL)), APInt(32, "-20", 36));
572 }
573
574 TEST(APIntTest, FromArray) {
575   EXPECT_EQ(APInt(32, uint64_t(1)), APInt(32, ArrayRef<uint64_t>(1)));
576 }
577
578 TEST(APIntTest, StringBitsNeeded2) {
579   EXPECT_EQ(1U, APInt::getBitsNeeded(  "0", 2));
580   EXPECT_EQ(1U, APInt::getBitsNeeded(  "1", 2));
581   EXPECT_EQ(2U, APInt::getBitsNeeded( "10", 2));
582   EXPECT_EQ(2U, APInt::getBitsNeeded( "11", 2));
583   EXPECT_EQ(3U, APInt::getBitsNeeded("100", 2));
584
585   EXPECT_EQ(1U, APInt::getBitsNeeded(  "+0", 2));
586   EXPECT_EQ(1U, APInt::getBitsNeeded(  "+1", 2));
587   EXPECT_EQ(2U, APInt::getBitsNeeded( "+10", 2));
588   EXPECT_EQ(2U, APInt::getBitsNeeded( "+11", 2));
589   EXPECT_EQ(3U, APInt::getBitsNeeded("+100", 2));
590
591   EXPECT_EQ(2U, APInt::getBitsNeeded(  "-0", 2));
592   EXPECT_EQ(2U, APInt::getBitsNeeded(  "-1", 2));
593   EXPECT_EQ(3U, APInt::getBitsNeeded( "-10", 2));
594   EXPECT_EQ(3U, APInt::getBitsNeeded( "-11", 2));
595   EXPECT_EQ(4U, APInt::getBitsNeeded("-100", 2));
596 }
597
598 TEST(APIntTest, StringBitsNeeded8) {
599   EXPECT_EQ(3U, APInt::getBitsNeeded( "0", 8));
600   EXPECT_EQ(3U, APInt::getBitsNeeded( "7", 8));
601   EXPECT_EQ(6U, APInt::getBitsNeeded("10", 8));
602   EXPECT_EQ(6U, APInt::getBitsNeeded("17", 8));
603   EXPECT_EQ(6U, APInt::getBitsNeeded("20", 8));
604
605   EXPECT_EQ(3U, APInt::getBitsNeeded( "+0", 8));
606   EXPECT_EQ(3U, APInt::getBitsNeeded( "+7", 8));
607   EXPECT_EQ(6U, APInt::getBitsNeeded("+10", 8));
608   EXPECT_EQ(6U, APInt::getBitsNeeded("+17", 8));
609   EXPECT_EQ(6U, APInt::getBitsNeeded("+20", 8));
610
611   EXPECT_EQ(4U, APInt::getBitsNeeded( "-0", 8));
612   EXPECT_EQ(4U, APInt::getBitsNeeded( "-7", 8));
613   EXPECT_EQ(7U, APInt::getBitsNeeded("-10", 8));
614   EXPECT_EQ(7U, APInt::getBitsNeeded("-17", 8));
615   EXPECT_EQ(7U, APInt::getBitsNeeded("-20", 8));
616 }
617
618 TEST(APIntTest, StringBitsNeeded10) {
619   EXPECT_EQ(1U, APInt::getBitsNeeded( "0", 10));
620   EXPECT_EQ(2U, APInt::getBitsNeeded( "3", 10));
621   EXPECT_EQ(4U, APInt::getBitsNeeded( "9", 10));
622   EXPECT_EQ(4U, APInt::getBitsNeeded("10", 10));
623   EXPECT_EQ(5U, APInt::getBitsNeeded("19", 10));
624   EXPECT_EQ(5U, APInt::getBitsNeeded("20", 10));
625
626   EXPECT_EQ(1U, APInt::getBitsNeeded( "+0", 10));
627   EXPECT_EQ(4U, APInt::getBitsNeeded( "+9", 10));
628   EXPECT_EQ(4U, APInt::getBitsNeeded("+10", 10));
629   EXPECT_EQ(5U, APInt::getBitsNeeded("+19", 10));
630   EXPECT_EQ(5U, APInt::getBitsNeeded("+20", 10));
631
632   EXPECT_EQ(2U, APInt::getBitsNeeded( "-0", 10));
633   EXPECT_EQ(5U, APInt::getBitsNeeded( "-9", 10));
634   EXPECT_EQ(5U, APInt::getBitsNeeded("-10", 10));
635   EXPECT_EQ(6U, APInt::getBitsNeeded("-19", 10));
636   EXPECT_EQ(6U, APInt::getBitsNeeded("-20", 10));
637 }
638
639 TEST(APIntTest, StringBitsNeeded16) {
640   EXPECT_EQ(4U, APInt::getBitsNeeded( "0", 16));
641   EXPECT_EQ(4U, APInt::getBitsNeeded( "F", 16));
642   EXPECT_EQ(8U, APInt::getBitsNeeded("10", 16));
643   EXPECT_EQ(8U, APInt::getBitsNeeded("1F", 16));
644   EXPECT_EQ(8U, APInt::getBitsNeeded("20", 16));
645
646   EXPECT_EQ(4U, APInt::getBitsNeeded( "+0", 16));
647   EXPECT_EQ(4U, APInt::getBitsNeeded( "+F", 16));
648   EXPECT_EQ(8U, APInt::getBitsNeeded("+10", 16));
649   EXPECT_EQ(8U, APInt::getBitsNeeded("+1F", 16));
650   EXPECT_EQ(8U, APInt::getBitsNeeded("+20", 16));
651
652   EXPECT_EQ(5U, APInt::getBitsNeeded( "-0", 16));
653   EXPECT_EQ(5U, APInt::getBitsNeeded( "-F", 16));
654   EXPECT_EQ(9U, APInt::getBitsNeeded("-10", 16));
655   EXPECT_EQ(9U, APInt::getBitsNeeded("-1F", 16));
656   EXPECT_EQ(9U, APInt::getBitsNeeded("-20", 16));
657 }
658
659 TEST(APIntTest, toString) {
660   SmallString<16> S;
661   bool isSigned;
662
663   APInt(8, 0).toString(S, 2, true, true);
664   EXPECT_EQ(S.str().str(), "0b0");
665   S.clear();
666   APInt(8, 0).toString(S, 8, true, true);
667   EXPECT_EQ(S.str().str(), "00");
668   S.clear();
669   APInt(8, 0).toString(S, 10, true, true);
670   EXPECT_EQ(S.str().str(), "0");
671   S.clear();
672   APInt(8, 0).toString(S, 16, true, true);
673   EXPECT_EQ(S.str().str(), "0x0");
674   S.clear();
675   APInt(8, 0).toString(S, 36, true, false);
676   EXPECT_EQ(S.str().str(), "0");
677   S.clear();
678
679   isSigned = false;
680   APInt(8, 255, isSigned).toString(S, 2, isSigned, true);
681   EXPECT_EQ(S.str().str(), "0b11111111");
682   S.clear();
683   APInt(8, 255, isSigned).toString(S, 8, isSigned, true);
684   EXPECT_EQ(S.str().str(), "0377");
685   S.clear();
686   APInt(8, 255, isSigned).toString(S, 10, isSigned, true);
687   EXPECT_EQ(S.str().str(), "255");
688   S.clear();
689   APInt(8, 255, isSigned).toString(S, 16, isSigned, true);
690   EXPECT_EQ(S.str().str(), "0xFF");
691   S.clear();
692   APInt(8, 255, isSigned).toString(S, 36, isSigned, false);
693   EXPECT_EQ(S.str().str(), "73");
694   S.clear();
695
696   isSigned = true;
697   APInt(8, 255, isSigned).toString(S, 2, isSigned, true);
698   EXPECT_EQ(S.str().str(), "-0b1");
699   S.clear();
700   APInt(8, 255, isSigned).toString(S, 8, isSigned, true);
701   EXPECT_EQ(S.str().str(), "-01");
702   S.clear();
703   APInt(8, 255, isSigned).toString(S, 10, isSigned, true);
704   EXPECT_EQ(S.str().str(), "-1");
705   S.clear();
706   APInt(8, 255, isSigned).toString(S, 16, isSigned, true);
707   EXPECT_EQ(S.str().str(), "-0x1");
708   S.clear();
709   APInt(8, 255, isSigned).toString(S, 36, isSigned, false);
710   EXPECT_EQ(S.str().str(), "-1");
711   S.clear();
712 }
713
714 TEST(APIntTest, Log2) {
715   EXPECT_EQ(APInt(15, 7).logBase2(), 2U);
716   EXPECT_EQ(APInt(15, 7).ceilLogBase2(), 3U);
717   EXPECT_EQ(APInt(15, 7).exactLogBase2(), -1);
718   EXPECT_EQ(APInt(15, 8).logBase2(), 3U);
719   EXPECT_EQ(APInt(15, 8).ceilLogBase2(), 3U);
720   EXPECT_EQ(APInt(15, 8).exactLogBase2(), 3);
721   EXPECT_EQ(APInt(15, 9).logBase2(), 3U);
722   EXPECT_EQ(APInt(15, 9).ceilLogBase2(), 4U);
723   EXPECT_EQ(APInt(15, 9).exactLogBase2(), -1);
724 }
725
726 TEST(APIntTest, magic) {
727   EXPECT_EQ(APInt(32, 3).magic().m, APInt(32, "55555556", 16));
728   EXPECT_EQ(APInt(32, 3).magic().s, 0U);
729   EXPECT_EQ(APInt(32, 5).magic().m, APInt(32, "66666667", 16));
730   EXPECT_EQ(APInt(32, 5).magic().s, 1U);
731   EXPECT_EQ(APInt(32, 7).magic().m, APInt(32, "92492493", 16));
732   EXPECT_EQ(APInt(32, 7).magic().s, 2U);
733 }
734
735 TEST(APIntTest, magicu) {
736   EXPECT_EQ(APInt(32, 3).magicu().m, APInt(32, "AAAAAAAB", 16));
737   EXPECT_EQ(APInt(32, 3).magicu().s, 1U);
738   EXPECT_EQ(APInt(32, 5).magicu().m, APInt(32, "CCCCCCCD", 16));
739   EXPECT_EQ(APInt(32, 5).magicu().s, 2U);
740   EXPECT_EQ(APInt(32, 7).magicu().m, APInt(32, "24924925", 16));
741   EXPECT_EQ(APInt(32, 7).magicu().s, 3U);
742   EXPECT_EQ(APInt(64, 25).magicu(1).m, APInt(64, "A3D70A3D70A3D70B", 16));
743   EXPECT_EQ(APInt(64, 25).magicu(1).s, 4U);
744 }
745
746 #ifdef GTEST_HAS_DEATH_TEST
747 #ifndef NDEBUG
748 TEST(APIntTest, StringDeath) {
749   EXPECT_DEATH(APInt(0, "", 0), "Bitwidth too small");
750   EXPECT_DEATH(APInt(32, "", 0), "Invalid string length");
751   EXPECT_DEATH(APInt(32, "0", 0), "Radix should be 2, 8, 10, 16, or 36!");
752   EXPECT_DEATH(APInt(32, "", 10), "Invalid string length");
753   EXPECT_DEATH(APInt(32, "-", 10), "String is only a sign, needs a value.");
754   EXPECT_DEATH(APInt(1, "1234", 10), "Insufficient bit width");
755   EXPECT_DEATH(APInt(32, "\0", 10), "Invalid string length");
756   EXPECT_DEATH(APInt(32, StringRef("1\02", 3), 10), "Invalid character in digit string");
757   EXPECT_DEATH(APInt(32, "1L", 10), "Invalid character in digit string");
758 }
759 #endif
760 #endif
761
762 TEST(APIntTest, mul_clear) {
763   APInt ValA(65, -1ULL);
764   APInt ValB(65, 4);
765   APInt ValC(65, 0);
766   ValC = ValA * ValB;
767   ValA *= ValB;
768   EXPECT_EQ(ValA.toString(10, false), ValC.toString(10, false));
769 }
770
771 TEST(APIntTest, Rotate) {
772   EXPECT_EQ(APInt(8, 1),  APInt(8, 1).rotl(0));
773   EXPECT_EQ(APInt(8, 2),  APInt(8, 1).rotl(1));
774   EXPECT_EQ(APInt(8, 4),  APInt(8, 1).rotl(2));
775   EXPECT_EQ(APInt(8, 16), APInt(8, 1).rotl(4));
776   EXPECT_EQ(APInt(8, 1),  APInt(8, 1).rotl(8));
777
778   EXPECT_EQ(APInt(8, 16), APInt(8, 16).rotl(0));
779   EXPECT_EQ(APInt(8, 32), APInt(8, 16).rotl(1));
780   EXPECT_EQ(APInt(8, 64), APInt(8, 16).rotl(2));
781   EXPECT_EQ(APInt(8, 1),  APInt(8, 16).rotl(4));
782   EXPECT_EQ(APInt(8, 16), APInt(8, 16).rotl(8));
783
784   EXPECT_EQ(APInt(8, 16), APInt(8, 16).rotr(0));
785   EXPECT_EQ(APInt(8, 8),  APInt(8, 16).rotr(1));
786   EXPECT_EQ(APInt(8, 4),  APInt(8, 16).rotr(2));
787   EXPECT_EQ(APInt(8, 1),  APInt(8, 16).rotr(4));
788   EXPECT_EQ(APInt(8, 16), APInt(8, 16).rotr(8));
789
790   EXPECT_EQ(APInt(8, 1),   APInt(8, 1).rotr(0));
791   EXPECT_EQ(APInt(8, 128), APInt(8, 1).rotr(1));
792   EXPECT_EQ(APInt(8, 64),  APInt(8, 1).rotr(2));
793   EXPECT_EQ(APInt(8, 16),  APInt(8, 1).rotr(4));
794   EXPECT_EQ(APInt(8, 1),   APInt(8, 1).rotr(8));
795
796   APInt Big(256, "00004000800000000000000000003fff8000000000000000", 16);
797   APInt Rot(256, "3fff80000000000000000000000000000000000040008000", 16);
798   EXPECT_EQ(Rot, Big.rotr(144));
799 }
800
801 TEST(APIntTest, Splat) {
802   APInt ValA(8, 0x01);
803   EXPECT_EQ(ValA, APInt::getSplat(8, ValA));
804   EXPECT_EQ(APInt(64, 0x0101010101010101ULL), APInt::getSplat(64, ValA));
805
806   APInt ValB(3, 5);
807   EXPECT_EQ(APInt(4, 0xD), APInt::getSplat(4, ValB));
808   EXPECT_EQ(APInt(15, 0xDB6D), APInt::getSplat(15, ValB));
809 }
810
811 TEST(APIntTest, tcDecrement) {
812   // Test single word decrement.
813
814   // No out borrow.
815   {
816     integerPart singleWord = ~integerPart(0) << (integerPartWidth - 1);
817     integerPart carry = APInt::tcDecrement(&singleWord, 1);
818     EXPECT_EQ(carry, integerPart(0));
819     EXPECT_EQ(singleWord, ~integerPart(0) >> 1);
820   }
821
822   // With out borrow.
823   {
824     integerPart singleWord = 0;
825     integerPart carry = APInt::tcDecrement(&singleWord, 1);
826     EXPECT_EQ(carry, integerPart(1));
827     EXPECT_EQ(singleWord, ~integerPart(0));
828   }
829
830   // Test multiword decrement.
831
832   // No across word borrow, no out borrow.
833   {
834     integerPart test[4] = {0x1, 0x1, 0x1, 0x1};
835     integerPart expected[4] = {0x0, 0x1, 0x1, 0x1};
836     APInt::tcDecrement(test, 4);
837     EXPECT_EQ(APInt::tcCompare(test, expected, 4), 0);
838   }
839
840   // 1 across word borrow, no out borrow.
841   {
842     integerPart test[4] = {0x0, 0xF, 0x1, 0x1};
843     integerPart expected[4] = {~integerPart(0), 0xE, 0x1, 0x1};
844     integerPart carry = APInt::tcDecrement(test, 4);
845     EXPECT_EQ(carry, integerPart(0));
846     EXPECT_EQ(APInt::tcCompare(test, expected, 4), 0);
847   }
848
849   // 2 across word borrow, no out borrow.
850   {
851     integerPart test[4] = {0x0, 0x0, 0xC, 0x1};
852     integerPart expected[4] = {~integerPart(0), ~integerPart(0), 0xB, 0x1};
853     integerPart carry = APInt::tcDecrement(test, 4);
854     EXPECT_EQ(carry, integerPart(0));
855     EXPECT_EQ(APInt::tcCompare(test, expected, 4), 0);
856   }
857
858   // 3 across word borrow, no out borrow.
859   {
860     integerPart test[4] = {0x0, 0x0, 0x0, 0x1};
861     integerPart expected[4] = {~integerPart(0), ~integerPart(0), ~integerPart(0), 0x0};
862     integerPart carry = APInt::tcDecrement(test, 4);
863     EXPECT_EQ(carry, integerPart(0));
864     EXPECT_EQ(APInt::tcCompare(test, expected, 4), 0);
865   }
866
867   // 3 across word borrow, with out borrow.
868   {
869     integerPart test[4] = {0x0, 0x0, 0x0, 0x0};
870     integerPart expected[4] = {~integerPart(0), ~integerPart(0), ~integerPart(0), ~integerPart(0)};
871     integerPart carry = APInt::tcDecrement(test, 4);
872     EXPECT_EQ(carry, integerPart(1));
873     EXPECT_EQ(APInt::tcCompare(test, expected, 4), 0);
874   }
875 }
876
877 TEST(APIntTest, arrayAccess) {
878   // Single word check.
879   uint64_t E1 = 0x2CA7F46BF6569915ULL;
880   APInt A1(64, E1);
881   for (unsigned i = 0, e = 64; i < e; ++i) {
882     EXPECT_EQ(bool(E1 & (1ULL << i)),
883               A1[i]);
884   }
885
886   // Multiword check.
887   integerPart E2[4] = {
888     0xEB6EB136591CBA21ULL,
889     0x7B9358BD6A33F10AULL,
890     0x7E7FFA5EADD8846ULL,
891     0x305F341CA00B613DULL
892   };
893   APInt A2(integerPartWidth*4, E2);
894   for (unsigned i = 0; i < 4; ++i) {
895     for (unsigned j = 0; j < integerPartWidth; ++j) {
896       EXPECT_EQ(bool(E2[i] & (1ULL << j)),
897                 A2[i*integerPartWidth + j]);
898     }
899   }
900 }
901
902 TEST(APIntTest, LargeAPIntConstruction) {
903   // Check that we can properly construct very large APInt. It is very
904   // unlikely that people will ever do this, but it is a legal input,
905   // so we should not crash on it.
906   APInt A9(UINT32_MAX, 0);
907   EXPECT_FALSE(A9.getBoolValue());
908 }
909
910 TEST(APIntTest, nearestLogBase2) {
911   // Single word check.
912
913   // Test round up.
914   uint64_t I1 = 0x1800001;
915   APInt A1(64, I1);
916   EXPECT_EQ(A1.nearestLogBase2(), A1.ceilLogBase2());
917
918   // Test round down.
919   uint64_t I2 = 0x1000011;
920   APInt A2(64, I2);
921   EXPECT_EQ(A2.nearestLogBase2(), A2.logBase2());
922
923   // Test ties round up.
924   uint64_t I3 = 0x1800000;
925   APInt A3(64, I3);
926   EXPECT_EQ(A3.nearestLogBase2(), A3.ceilLogBase2());
927
928   // Multiple word check.
929
930   // Test round up.
931   integerPart I4[4] = {0x0, 0xF, 0x18, 0x0};
932   APInt A4(integerPartWidth*4, I4);
933   EXPECT_EQ(A4.nearestLogBase2(), A4.ceilLogBase2());
934
935   // Test round down.
936   integerPart I5[4] = {0x0, 0xF, 0x10, 0x0};
937   APInt A5(integerPartWidth*4, I5);
938   EXPECT_EQ(A5.nearestLogBase2(), A5.logBase2());
939
940   // Test ties round up.
941   uint64_t I6[4] = {0x0, 0x0, 0x0, 0x18};
942   APInt A6(integerPartWidth*4, I6);
943   EXPECT_EQ(A6.nearestLogBase2(), A6.ceilLogBase2());
944
945   // Test BitWidth == 1 special cases.
946   APInt A7(1, 1);
947   EXPECT_EQ(A7.nearestLogBase2(), 0ULL);
948   APInt A8(1, 0);
949   EXPECT_EQ(A8.nearestLogBase2(), UINT32_MAX);
950
951   // Test the zero case when we have a bit width large enough such
952   // that the bit width is larger than UINT32_MAX-1.
953   APInt A9(UINT32_MAX, 0);
954   EXPECT_EQ(A9.nearestLogBase2(), UINT32_MAX);
955 }
956
957 TEST(APIntTest, IsSplat) {
958   APInt A(32, 0x01010101);
959   EXPECT_FALSE(A.isSplat(1));
960   EXPECT_FALSE(A.isSplat(2));
961   EXPECT_FALSE(A.isSplat(4));
962   EXPECT_TRUE(A.isSplat(8));
963   EXPECT_TRUE(A.isSplat(16));
964   EXPECT_TRUE(A.isSplat(32));
965
966   APInt B(24, 0xAAAAAA);
967   EXPECT_FALSE(B.isSplat(1));
968   EXPECT_TRUE(B.isSplat(2));
969   EXPECT_TRUE(B.isSplat(4));
970   EXPECT_TRUE(B.isSplat(8));
971   EXPECT_TRUE(B.isSplat(24));
972
973   APInt C(24, 0xABAAAB);
974   EXPECT_FALSE(C.isSplat(1));
975   EXPECT_FALSE(C.isSplat(2));
976   EXPECT_FALSE(C.isSplat(4));
977   EXPECT_FALSE(C.isSplat(8));
978   EXPECT_TRUE(C.isSplat(24));
979
980   APInt D(32, 0xABBAABBA);
981   EXPECT_FALSE(D.isSplat(1));
982   EXPECT_FALSE(D.isSplat(2));
983   EXPECT_FALSE(D.isSplat(4));
984   EXPECT_FALSE(D.isSplat(8));
985   EXPECT_TRUE(D.isSplat(16));
986   EXPECT_TRUE(D.isSplat(32));
987
988   APInt E(32, 0);
989   EXPECT_TRUE(E.isSplat(1));
990   EXPECT_TRUE(E.isSplat(2));
991   EXPECT_TRUE(E.isSplat(4));
992   EXPECT_TRUE(E.isSplat(8));
993   EXPECT_TRUE(E.isSplat(16));
994   EXPECT_TRUE(E.isSplat(32));
995 }
996
997 #if defined(__clang__)
998 // Disable the pragma warning from versions of Clang without -Wself-move
999 #pragma clang diagnostic push
1000 #pragma clang diagnostic ignored "-Wunknown-pragmas"
1001 // Disable the warning that triggers on exactly what is being tested.
1002 #pragma clang diagnostic push
1003 #pragma clang diagnostic ignored "-Wself-move"
1004 #endif
1005 TEST(APIntTest, SelfMoveAssignment) {
1006   APInt X(32, 0xdeadbeef);
1007   X = std::move(X);
1008   EXPECT_EQ(32u, X.getBitWidth());
1009   EXPECT_EQ(0xdeadbeefULL, X.getLimitedValue());
1010
1011   uint64_t Bits[] = {0xdeadbeefdeadbeefULL, 0xdeadbeefdeadbeefULL};
1012   APInt Y(128, Bits);
1013   Y = std::move(Y);
1014   EXPECT_EQ(128u, Y.getBitWidth());
1015   EXPECT_EQ(~0ULL, Y.getLimitedValue());
1016   const uint64_t *Raw = Y.getRawData();
1017   EXPECT_EQ(2u, Y.getNumWords());
1018   EXPECT_EQ(0xdeadbeefdeadbeefULL, Raw[0]);
1019   EXPECT_EQ(0xdeadbeefdeadbeefULL, Raw[1]);
1020 }
1021 #if defined(__clang__)
1022 #pragma clang diagnostic pop
1023 #pragma clang diagnostic pop
1024 #endif
1025 }