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llvm-project/clang/test/OpenMP/distribute_parallel_for_private_messages.cpp
Carlo Bertolli 9925f15661 Resubmission of http://reviews.llvm.org/D21564 after fixes. 
[OpenMP] Initial implementation of parse and sema for composite pragma 'distribute parallel for'

This patch is an initial implementation for #distribute parallel for.
The main differences that affect other pragmas are:

The implementation of 'distribute parallel for' requires blocking of the associated loop, where blocks are "distributed" to different teams and iterations within each block are scheduled to parallel threads within each team. To implement blocking, sema creates two additional worksharing directive fields that are used to pass the team assigned block lower and upper bounds through the outlined function resulting from 'parallel'. In this way, scheduling for 'for' to threads can use those bounds.
As a consequence of blocking, the stride of 'distribute' is not 1 but it is equal to the blocking size. This is returned by the runtime and sema prepares a DistIncrExpr variable to hold that value.
As a consequence of blocking, the global upper bound (EnsureUpperBound) expression of the 'for' is not the original loop upper bound (e.g. in for(i = 0 ; i < N; i++) this is 'N') but it is the team-assigned block upper bound. Sema creates a new expression holding the calculation of the actual upper bound for 'for' as UB = min(UB, PrevUB), where UB is the loop upper bound, and PrevUB is the team-assigned block upper bound.

llvm-svn: 273884
2016-06-27 14:55:37 +00:00

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// RUN: %clang_cc1 -verify -fopenmp %s
void foo() {
}
bool foobool(int argc) {
return argc;
}
struct S1; // expected-note 2 {{declared here}} expected-note 2 {{forward declaration of 'S1'}}
extern S1 a;
class S2 {
mutable int a;
public:
S2() : a(0) {}
};
const S2 b;
const S2 ba[5];
class S3 {
int a;
public:
S3() : a(0) {}
};
const S3 ca[5];
class S4 {
int a;
S4(); // expected-note {{implicitly declared private here}}
public:
S4(int v) : a(v) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a)
for (int k = 0; k < v; ++k)
++this->a;
}
};
class S5 {
int a;
S5() : a(0) {} // expected-note {{implicitly declared private here}}
public:
S5(int v) : a(v) {}
S5 &operator=(S5 &s) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a) private(s.a) // expected-error {{expected variable name or data member of current class}}
for (int k = 0; k < s.a; ++k)
++s.a;
return *this;
}
};
template <typename T>
class S6 {
public:
T a;
S6() : a(0) {}
S6(T v) : a(v) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a)
for (int k = 0; k < v; ++k)
++this->a;
}
S6 &operator=(S6 &s) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a) private(s.a) // expected-error {{expected variable name or data member of current class}}
for (int k = 0; k < s.a; ++k)
++s.a;
return *this;
}
};
template <typename T>
class S7 : public T {
T a;
S7() : a(0) {}
public:
S7(T v) : a(v) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a) private(T::a)
for (int k = 0; k < a.a; ++k)
++this->a.a;
}
S7 &operator=(S7 &s) {
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a) private(this->a) private(s.a) private(s.T::a) // expected-error 2 {{expected variable name or data member of current class}}
for (int k = 0; k < s.a.a; ++k)
++s.a.a;
return *this;
}
};
S3 h;
#pragma omp threadprivate(h) // expected-note 2 {{defined as threadprivate or thread local}}
template <class I, class C>
int foomain(I argc, C **argv) {
I e(4);
I g(5);
int i;
int &j = i;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private // expected-error {{expected '(' after 'private'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private() // expected-error {{expected expression}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc)
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(S1) // expected-error {{'S1' does not refer to a value}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a, b) // expected-error {{private variable with incomplete type 'S1'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argv[1]) // expected-error {{expected variable name}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(e, g)
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(h) // expected-error {{threadprivate or thread local variable cannot be private}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for nowait // expected-error {{unexpected OpenMP clause 'nowait' in directive '#pragma omp distribute parallel for'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp parallel
{
int v = 0;
int i;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(i)
for (int k = 0; k < argc; ++k) {
i = k;
v += i;
}
}
#pragma omp parallel shared(i)
#pragma omp parallel private(i)
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(j)
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(i)
for (int k = 0; k < argc; ++k)
++k;
return 0;
}
namespace A {
double x;
#pragma omp threadprivate(x) // expected-note {{defined as threadprivate or thread local}}
}
namespace B {
using A::x;
}
int main(int argc, char **argv) {
S4 e(4);
S5 g(5);
S6<float> s6(0.0) , s6_0(1.0);
S7<S6<float> > s7(0.0) , s7_0(1.0);
int i;
int &j = i;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private // expected-error {{expected '(' after 'private'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private() // expected-error {{expected expression}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc > 0 ? argv[1] : argv[2]) // expected-error {{expected variable name}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argc)
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(S1) // expected-error {{'S1' does not refer to a value}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(a, b) // expected-error {{private variable with incomplete type 'S1'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(argv[1]) // expected-error {{expected variable name}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(e, g) // expected-error {{calling a private constructor of class 'S4'}} expected-error {{calling a private constructor of class 'S5'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(h, B::x) // expected-error 2 {{threadprivate or thread local variable cannot be private}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for nowait // expected-error {{unexpected OpenMP clause 'nowait' in directive '#pragma omp distribute parallel for'}}
for (int k = 0; k < argc; ++k)
++k;
#pragma omp parallel
{
int i;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(i)
for (int k = 0; k < argc; ++k)
++k;
}
#pragma omp parallel shared(i)
#pragma omp parallel private(i)
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(j)
for (int k = 0; k < argc; ++k)
++k;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(i)
for (int k = 0; k < argc; ++k)
++k;
static int m;
#pragma omp target
#pragma omp teams
#pragma omp distribute parallel for private(m)
for (int k = 0; k < argc; ++k)
m = k + 2;
s6 = s6_0; // expected-note {{in instantiation of member function 'S6<float>::operator=' requested here}}
s7 = s7_0; // expected-note {{in instantiation of member function 'S7<S6<float> >::operator=' requested here}}
return foomain(argc, argv); // expected-note {{in instantiation of function template specialization 'foomain<int, char>' requested here}}
}
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