1 // RUN: %clang_cc1 -fsyntax-only -fopenmp=libiomp5 -x c++ -std=c++11 -fexceptions -fcxx-exceptions -verify %s
2 
3 static int sii;
4 #pragma omp threadprivate(sii) // expected-note {{defined as threadprivate or thread local}}
5 
6 int test_iteration_spaces() {
7   const int N = 100;
8   float a[N], b[N], c[N];
9   int ii, jj, kk;
10   float fii;
11   double dii;
12   #pragma omp simd
13   for (int i = 0; i < 10; i+=1) {
14     c[i] = a[i] + b[i];
15   }
16   #pragma omp simd
17   for (char i = 0; i < 10; i++) {
18     c[i] = a[i] + b[i];
19   }
20   #pragma omp simd
21   for (char i = 0; i < 10; i+='\1') {
22     c[i] = a[i] + b[i];
23   }
24   #pragma omp simd
25   for (long long i = 0; i < 10; i++) {
26     c[i] = a[i] + b[i];
27   }
28   // expected-error@+2 {{expression must have integral or unscoped enumeration type, not 'double'}}
29   #pragma omp simd
30   for (long long i = 0; i < 10; i+=1.5) {
31     c[i] = a[i] + b[i];
32   }
33   #pragma omp simd
34   for (long long i = 0; i < 'z'; i+=1u) {
35     c[i] = a[i] + b[i];
36   }
37   // expected-error@+2 {{variable must be of integer or random access iterator type}}
38   #pragma omp simd
39   for (float fi = 0; fi < 10.0; fi++) {
40     c[(int)fi] = a[(int)fi] + b[(int)fi];
41   }
42   // expected-error@+2 {{variable must be of integer or random access iterator type}}
43   #pragma omp simd
44   for (double fi = 0; fi < 10.0; fi++) {
45     c[(int)fi] = a[(int)fi] + b[(int)fi];
46   }
47   // expected-error@+2 {{variable must be of integer or random access iterator type}}
48   #pragma omp simd
49   for (int &ref = ii; ref < 10; ref++) {
50   }
51   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
52   #pragma omp simd
53   for (int i; i < 10; i++)
54     c[i] = a[i];
55 
56   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
57   #pragma omp simd
58   for (int i = 0, j = 0; i < 10; ++i)
59     c[i] = a[i];
60 
61   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
62   #pragma omp simd
63   for (;ii < 10; ++ii)
64     c[ii] = a[ii];
65 
66   // expected-warning@+3 {{expression result unused}}
67   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
68   #pragma omp simd
69   for (ii + 1;ii < 10; ++ii)
70     c[ii] = a[ii];
71 
72   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
73   #pragma omp simd
74   for (c[ii] = 0;ii < 10; ++ii)
75     c[ii] = a[ii];
76 
77   // Ok to skip parenthesises.
78   #pragma omp simd
79   for (((ii)) = 0;ii < 10; ++ii)
80     c[ii] = a[ii];
81 
82   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
83   #pragma omp simd
84   for (int i = 0; i; i++)
85     c[i] = a[i];
86 
87   // expected-error@+3 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
88   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'i'}}
89   #pragma omp simd
90   for (int i = 0; jj < kk; ii++)
91     c[i] = a[i];
92 
93   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
94   #pragma omp simd
95   for (int i = 0; !!i; i++)
96     c[i] = a[i];
97 
98   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
99   #pragma omp simd
100   for (int i = 0; i != 1; i++)
101     c[i] = a[i];
102 
103   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'i'}}
104   #pragma omp simd
105   for (int i = 0; ; i++)
106     c[i] = a[i];
107 
108   // Ok.
109   #pragma omp simd
110   for (int i = 11; i > 10; i--)
111     c[i] = a[i];
112 
113   // Ok.
114   #pragma omp simd
115   for (int i = 0; i < 10; ++i)
116     c[i] = a[i];
117 
118     // Ok.
119   #pragma omp simd
120   for (ii = 0; ii < 10; ++ii)
121     c[ii] = a[ii];
122 
123   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
124   #pragma omp simd
125   for (ii = 0; ii < 10; ++jj)
126     c[ii] = a[jj];
127 
128   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
129   #pragma omp simd
130   for (ii = 0; ii < 10; ++ ++ ii)
131     c[ii] = a[ii];
132 
133   // Ok but undefined behavior (in general, cannot check that incr
134   // is really loop-invariant).
135   #pragma omp simd
136   for (ii = 0; ii < 10; ii = ii + ii)
137     c[ii] = a[ii];
138 
139   // expected-error@+2 {{expression must have integral or unscoped enumeration type, not 'float'}}
140   #pragma omp simd
141   for (ii = 0; ii < 10; ii = ii + 1.0f)
142     c[ii] = a[ii];
143 
144   // Ok - step was converted to integer type.
145   #pragma omp simd
146   for (ii = 0; ii < 10; ii = ii + (int)1.1f)
147     c[ii] = a[ii];
148 
149   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
150   #pragma omp simd
151   for (ii = 0; ii < 10; jj = ii + 2)
152     c[ii] = a[ii];
153 
154   // expected-warning@+3 {{relational comparison result unused}}
155   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
156   #pragma omp simd
157   for (ii = 0; ii < 10; jj > kk + 2)
158     c[ii] = a[ii];
159 
160   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
161   #pragma omp simd
162   for (ii = 0; ii < 10;)
163     c[ii] = a[ii];
164 
165   // expected-warning@+3 {{expression result unused}}
166   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
167   #pragma omp simd
168   for (ii = 0; ii < 10; !ii)
169     c[ii] = a[ii];
170 
171   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
172   #pragma omp simd
173   for (ii = 0; ii < 10; ii ? ++ii : ++jj)
174     c[ii] = a[ii];
175 
176   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'ii'}}
177   #pragma omp simd
178   for (ii = 0; ii < 10; ii = ii < 10)
179     c[ii] = a[ii];
180 
181   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
182   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
183   #pragma omp simd
184   for (ii = 0; ii < 10; ii = ii + 0)
185     c[ii] = a[ii];
186 
187   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
188   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
189   #pragma omp simd
190   for (ii = 0; ii < 10; ii = ii + (int)(0.8 - 0.45))
191     c[ii] = a[ii];
192 
193   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
194   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
195   #pragma omp simd
196   for (ii = 0; (ii) < 10; ii-=25)
197     c[ii] = a[ii];
198 
199   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
200   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
201   #pragma omp simd
202   for (ii = 0; (ii < 10); ii-=0)
203     c[ii] = a[ii];
204 
205   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
206   // expected-error@+2 {{increment expression must cause 'ii' to decrease on each iteration of OpenMP for loop}}
207   #pragma omp simd
208   for (ii = 0; ii > 10; (ii+=0))
209     c[ii] = a[ii];
210 
211   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
212   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
213   #pragma omp simd
214   for (ii = 0; ii < 10; (ii) = (1-1)+(ii))
215     c[ii] = a[ii];
216 
217   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
218   // expected-error@+2 {{increment expression must cause 'ii' to decrease on each iteration of OpenMP for loop}}
219   #pragma omp simd
220   for ((ii = 0); ii > 10; (ii-=0))
221     c[ii] = a[ii];
222 
223   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
224   // expected-error@+2 {{increment expression must cause 'ii' to increase on each iteration of OpenMP for loop}}
225   #pragma omp simd
226   for (ii = 0; (ii < 10); (ii-=0))
227     c[ii] = a[ii];
228 
229   // expected-note@+2  {{defined as private}}
230   // expected-error@+2 {{loop iteration variable may not be private}}
231   #pragma omp simd private(ii)
232   for (ii = 0; ii < 10; ii++)
233     c[ii] = a[ii];
234 
235   // expected-error@+3 {{unexpected OpenMP clause 'shared' in directive '#pragma omp simd'}}
236   // expected-note@+2  {{defined as shared}}
237   // expected-error@+2 {{loop iteration variable may not be shared}}
238   #pragma omp simd shared(ii)
239   for (ii = 0; ii < 10; ii++)
240     c[ii] = a[ii];
241 
242   #pragma omp simd linear(ii)
243   for (ii = 0; ii < 10; ii++)
244     c[ii] = a[ii];
245 
246   #pragma omp simd lastprivate(ii)
247   for (ii = 0; ii < 10; ii++)
248     c[ii] = a[ii];
249 
250 
251   #pragma omp parallel
252   {
253     // expected-error@+2 {{loop iteration variable may not be threadprivate or thread local}}
254     #pragma omp simd
255     for (sii = 0; sii < 10; sii+=1)
256       c[sii] = a[sii];
257   }
258 
259   // expected-error@+2 {{statement after '#pragma omp simd' must be a for loop}}
260   #pragma omp simd
261   for (auto &item : a) {
262     item = item + 1;
263   }
264 
265   // expected-note@+3 {{loop step is expected to be positive due to this condition}}
266   // expected-error@+2 {{increment expression must cause 'i' to increase on each iteration of OpenMP for loop}}
267   #pragma omp simd
268   for (unsigned i = 9; i < 10; i--) {
269     c[i] = a[i] + b[i];
270   }
271 
272   int (*lb)[4] = nullptr;
273   #pragma omp simd
274   for (int (*p)[4] = lb; p < lb + 8; ++p) {
275   }
276 
277   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
278   #pragma omp simd
279   for (int a{0}; a<10; ++a) {
280   }
281 
282   return 0;
283 }
284 
285 // Iterators allowed in openmp for-loops.
286 namespace std {
287 struct random_access_iterator_tag { };
288 template <class Iter> struct iterator_traits {
289   typedef typename Iter::difference_type difference_type;
290   typedef typename Iter::iterator_category iterator_category;
291 };
292 template <class Iter>
293 typename iterator_traits<Iter>::difference_type
294 distance(Iter first, Iter last) { return first - last; }
295 }
296 class Iter0 {
297   public:
298     Iter0() { }
299     Iter0(const Iter0 &) { }
300     Iter0 operator ++() { return *this; }
301     Iter0 operator --() { return *this; }
302     bool operator <(Iter0 a) { return true; }
303 };
304 int operator -(Iter0 a, Iter0 b) { return 0; }
305 class Iter1 {
306   public:
307     Iter1(float f=0.0f, double d=0.0) { }
308     Iter1(const Iter1 &) { }
309     Iter1 operator ++() { return *this; }
310     Iter1 operator --() { return *this; }
311     bool operator <(Iter1 a) { return true; }
312     bool operator >=(Iter1 a) { return false; }
313 };
314 class GoodIter {
315   public:
316     GoodIter() { }
317     GoodIter(const GoodIter &) { }
318     GoodIter(int fst, int snd) { }
319     GoodIter &operator =(const GoodIter &that) { return *this; }
320     GoodIter &operator =(const Iter0 &that) { return *this; }
321     GoodIter &operator +=(int x) { return *this; }
322     explicit GoodIter(void *) { }
323     GoodIter operator ++() { return *this; }
324     GoodIter operator --() { return *this; }
325     bool operator !() { return true; }
326     bool operator <(GoodIter a) { return true; }
327     bool operator <=(GoodIter a) { return true; }
328     bool operator >=(GoodIter a) { return false; }
329     typedef int difference_type;
330     typedef std::random_access_iterator_tag iterator_category;
331 };
332 int operator -(GoodIter a, GoodIter b) { return 0; }
333 GoodIter operator -(GoodIter a) { return a; }
334 GoodIter operator -(GoodIter a, int v) { return GoodIter(); }
335 GoodIter operator +(GoodIter a, int v) { return GoodIter(); }
336 GoodIter operator -(int v, GoodIter a) { return GoodIter(); }
337 GoodIter operator +(int v, GoodIter a) { return GoodIter(); }
338 
339 int test_with_random_access_iterator() {
340   GoodIter begin, end;
341   Iter0 begin0, end0;
342   #pragma omp simd
343   for (GoodIter I = begin; I < end; ++I)
344     ++I;
345   // expected-error@+2 {{variable must be of integer or random access iterator type}}
346   #pragma omp simd
347   for (GoodIter &I = begin; I < end; ++I)
348     ++I;
349   #pragma omp simd
350   for (GoodIter I = begin; I >= end; --I)
351     ++I;
352   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
353   #pragma omp simd
354   for (GoodIter I(begin); I < end; ++I)
355     ++I;
356   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
357   #pragma omp simd
358   for (GoodIter I(nullptr); I < end; ++I)
359     ++I;
360   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
361   #pragma omp simd
362   for (GoodIter I(0); I < end; ++I)
363     ++I;
364   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
365   #pragma omp simd
366   for (GoodIter I(1,2); I < end; ++I)
367     ++I;
368   #pragma omp simd
369   for (begin = GoodIter(0); begin < end; ++begin)
370     ++begin;
371   #pragma omp simd
372   for (begin = begin0; begin < end; ++begin)
373     ++begin;
374   // expected-error@+2 {{initialization clause of OpenMP for loop must be of the form 'var = init' or 'T var = init'}}
375   #pragma omp simd
376   for (++begin; begin < end; ++begin)
377     ++begin;
378   #pragma omp simd
379   for (begin = end; begin < end; ++begin)
380     ++begin;
381   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}}
382   #pragma omp simd
383   for (GoodIter I = begin; I - I; ++I)
384     ++I;
385   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}}
386   #pragma omp simd
387   for (GoodIter I = begin; begin < end; ++I)
388     ++I;
389   // expected-error@+2 {{condition of OpenMP for loop must be a relational comparison ('<', '<=', '>', or '>=') of loop variable 'I'}}
390   #pragma omp simd
391   for (GoodIter I = begin; !I; ++I)
392     ++I;
393   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
394   // expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
395   #pragma omp simd
396   for (GoodIter I = begin; I >= end; I = I + 1)
397     ++I;
398   #pragma omp simd
399   for (GoodIter I = begin; I >= end; I = I - 1)
400     ++I;
401   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'I'}}
402   #pragma omp simd
403   for (GoodIter I = begin; I >= end; I = -I)
404     ++I;
405   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
406   // expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
407   #pragma omp simd
408   for (GoodIter I = begin; I >= end; I = 2 + I)
409     ++I;
410   // expected-error@+2 {{increment clause of OpenMP for loop must perform simple addition or subtraction on loop variable 'I'}}
411   #pragma omp simd
412   for (GoodIter I = begin; I >= end; I = 2 - I)
413     ++I;
414   #pragma omp simd
415   for (Iter0 I = begin0; I < end0; ++I)
416     ++I;
417   // Initializer is constructor without params.
418   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
419   #pragma omp simd
420   for (Iter0 I; I < end0; ++I)
421     ++I;
422   Iter1 begin1, end1;
423   #pragma omp simd
424   for (Iter1 I = begin1; I < end1; ++I)
425     ++I;
426   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
427   // expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
428   #pragma omp simd
429   for (Iter1 I = begin1; I >= end1; ++I)
430     ++I;
431   // Initializer is constructor with all default params.
432   // expected-warning@+2 {{initialization clause of OpenMP for loop is not in canonical form ('var = init' or 'T var = init')}}
433   #pragma omp simd
434   for (Iter1 I; I < end1; ++I) {
435   }
436   return 0;
437 }
438 
439 template <typename IT, int ST> class TC {
440   public:
441     int dotest_lt(IT begin, IT end) {
442       // expected-note@+3 {{loop step is expected to be positive due to this condition}}
443       // expected-error@+2 {{increment expression must cause 'I' to increase on each iteration of OpenMP for loop}}
444       #pragma omp simd
445       for (IT I = begin; I < end; I = I + ST) {
446         ++I;
447       }
448       // expected-note@+3 {{loop step is expected to be positive due to this condition}}
449       // expected-error@+2 {{increment expression must cause 'I' to increase on each iteration of OpenMP for loop}}
450       #pragma omp simd
451       for (IT I = begin; I <= end; I += ST) {
452         ++I;
453       }
454       #pragma omp simd
455       for (IT I = begin; I < end; ++I) {
456         ++I;
457       }
458     }
459 
460     static IT step() {
461       return IT(ST);
462     }
463 };
464 template <typename IT, int ST=0> int dotest_gt(IT begin, IT end) {
465   // expected-note@+3 2 {{loop step is expected to be negative due to this condition}}
466   // expected-error@+2 2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
467   #pragma omp simd
468   for (IT I = begin; I >= end; I = I + ST) {
469     ++I;
470   }
471   // expected-note@+3 2 {{loop step is expected to be negative due to this condition}}
472   // expected-error@+2 2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
473   #pragma omp simd
474   for (IT I = begin; I >= end; I += ST) {
475     ++I;
476   }
477 
478   // expected-note@+3 {{loop step is expected to be negative due to this condition}}
479   // expected-error@+2 {{increment expression must cause 'I' to decrease on each iteration of OpenMP for loop}}
480   #pragma omp simd
481   for (IT I = begin; I >= end; ++I) {
482     ++I;
483   }
484 
485   #pragma omp simd
486   for (IT I = begin; I < end; I+=TC<int,ST>::step()) {
487     ++I;
488   }
489 }
490 
491 void test_with_template() {
492   GoodIter begin, end;
493   TC<GoodIter, 100> t1;
494   TC<GoodIter, -100> t2;
495   t1.dotest_lt(begin, end);
496   t2.dotest_lt(begin, end); // expected-note {{in instantiation of member function 'TC<GoodIter, -100>::dotest_lt' requested here}}
497   dotest_gt(begin, end); // expected-note {{in instantiation of function template specialization 'dotest_gt<GoodIter, 0>' requested here}}
498   dotest_gt<unsigned, -10>(0, 100); // expected-note {{in instantiation of function template specialization 'dotest_gt<unsigned int, -10>' requested here}}
499 }
500 
501 void test_loop_break() {
502   const int N = 100;
503   float a[N], b[N], c[N];
504   #pragma omp simd
505   for (int i = 0; i < 10; i++) {
506     c[i] = a[i] + b[i];
507     for (int j = 0; j < 10; ++j) {
508       if (a[i] > b[j])
509         break; // OK in nested loop
510     }
511     switch(i) {
512       case 1:
513         b[i]++;
514         break;
515       default:
516         break;
517     }
518     if (c[i] > 10)
519       break; // expected-error {{'break' statement cannot be used in OpenMP for loop}}
520 
521     if (c[i] > 11)
522       break; // expected-error {{'break' statement cannot be used in OpenMP for loop}}
523   }
524 
525   #pragma omp simd
526   for (int i = 0; i < 10; i++) {
527     for (int j = 0; j < 10; j++) {
528       c[i] = a[i] + b[i];
529       if (c[i] > 10) {
530         if (c[i] < 20) {
531           break; // OK
532         }
533       }
534     }
535   }
536 }
537 
538 void test_loop_eh() {
539   const int N = 100;
540   float a[N], b[N], c[N];
541   #pragma omp simd
542   for (int i = 0; i < 10; i++) {
543     c[i] = a[i] + b[i];
544     try { // expected-error {{'try' statement cannot be used in OpenMP simd region}}
545       for (int j = 0; j < 10; ++j) {
546         if (a[i] > b[j])
547           throw a[i]; // expected-error {{'throw' statement cannot be used in OpenMP simd region}}
548       }
549       throw a[i]; // expected-error {{'throw' statement cannot be used in OpenMP simd region}}
550     }
551     catch (float f) {
552       if (f > 0.1)
553         throw a[i]; // expected-error {{'throw' statement cannot be used in OpenMP simd region}}
554       return; // expected-error {{cannot return from OpenMP region}}
555     }
556     switch(i) {
557       case 1:
558         b[i]++;
559         break;
560       default:
561         break;
562     }
563     for (int j = 0; j < 10; j++) {
564       if (c[i] > 10)
565         throw c[i]; // expected-error {{'throw' statement cannot be used in OpenMP simd region}}
566     }
567   }
568   if (c[9] > 10)
569     throw c[9]; // OK
570 
571   #pragma omp simd
572   for (int i = 0; i < 10; ++i) {
573     struct S {
574       void g() { throw 0; }
575     };
576   }
577 }
578 
579