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

1 files changed, 100 insertions, 0 deletions

diff --git a/clang/test/OpenMP/distribute_parallel_for_default_messages.cpp b/clang/test/OpenMP/distribute_parallel_for_default_messages.cpp
new file mode 100644
index 00000000000..3437bd55cf3
--- /dev/null
+++ b/clang/test/OpenMP/distribute_parallel_for_default_messages.cpp
@@ -0,0 +1,100 @@
+// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 -o - %s
+
+void foo();
+
+template <class T, int N>
+T tmain(T argc) {
+  int i;
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default // expected-error {{expected '(' after 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default( // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default() // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(none // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i) // expected-error 2 {{variable 'argc' must have explicitly specified data sharing attributes}}
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(shared), default(shared) // expected-error {{directive '#pragma omp distribute parallel for' cannot contain more than one 'default' clause}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(x) // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(none)
+  for (i = 0; i < argc; ++i)  // expected-error 2 {{variable 'argc' must have explicitly specified data sharing attributes}}
+    foo();
+
+#pragma omp parallel default(none)
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(shared)
+  for (i = 0; i < argc; ++i)
+    foo();
+
+  return T();
+}
+
+int main(int argc, char **argv) {
+  int i;
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default // expected-error {{expected '(' after 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default( // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default() // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(none // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  for (i = 0; i < argc; ++i) // expected-error {{variable 'argc' must have explicitly specified data sharing attributes}}
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(shared), default(shared) // expected-error {{directive '#pragma omp distribute parallel for' cannot contain more than one 'default' clause}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(x) // expected-error {{expected 'none' or 'shared' in OpenMP clause 'default'}}
+  for (i = 0; i < argc; ++i)
+    foo();
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(none)
+  for (i = 0; i < argc; ++i)  // expected-error {{variable 'argc' must have explicitly specified data sharing attributes}}
+    foo();
+
+#pragma omp parallel default(none)
+#pragma omp target
+#pragma omp teams
+#pragma omp distribute parallel for default(shared)
+  for (i = 0; i < argc; ++i)
+    foo();
+
+  return (tmain<int, 5>(argc) + tmain<char, 1>(argv[0][0])); // expected-note {{in instantiation of function template specialization 'tmain<int, 5>' requested here}} expected-note {{in instantiation of function template specialization 'tmain<char, 1>' requested here}}
+}