[OpenMP] Fix doacross testing for gcc

This patch adds a test using the doacross clauses in OpenMP and removes gcc from
testing kmp_doacross_check.c which is only testing the kmp rather than the
gomp interface.

Differential Revision: https://reviews.llvm.org/D50014

llvm-svn: 338757

openmp/cmake/OpenMPTesting.cmake

@@ -87,7 +87,9 @@ function(set_test_compiler_information dir)
 
     # Determine major version.
     string(REGEX MATCH "[0-9]+" major "${OPENMP_TEST_C_COMPILER_VERSION}")
+    string(REGEX MATCH "[0-9]+\\.[0-9]+" majorminor "${OPENMP_TEST_C_COMPILER_VERSION}")
     set(OPENMP_TEST_COMPILER_VERSION_MAJOR "${major}" PARENT_SCOPE)
+    set(OPENMP_TEST_COMPILER_VERSION_MAJOR_MINOR "${majorminor}" PARENT_SCOPE)
   endif()
 endfunction()
 
@@ -117,6 +119,7 @@ else()
   # Cannot use CLANG_VERSION because we are not guaranteed that this is already set.
   set(OPENMP_TEST_COMPILER_VERSION "${LLVM_VERSION}")
   set(OPENMP_TEST_COMPILER_VERSION_MAJOR "${LLVM_MAJOR_VERSION}")
+  set(OPENMP_TEST_COMPILER_VERSION_MAJOR_MINOR "${LLVM_MAJOR_VERSION}.${LLVM_MINOR_VERSION}")
   # TODO: Implement blockaddress in GlobalISel and remove this flag!
   set(OPENMP_TEST_COMPILER_OPENMP_FLAGS "-fopenmp -fno-experimental-isel")
 endif()
@@ -131,7 +134,7 @@ function(set_test_compiler_features)
     # Just use the lowercase of the compiler ID as fallback.
     string(TOLOWER "${OPENMP_TEST_COMPILER_ID}" comp)
   endif()
-  set(OPENMP_TEST_COMPILER_FEATURES "['${comp}', '${comp}-${OPENMP_TEST_COMPILER_VERSION_MAJOR}', '${comp}-${OPENMP_TEST_COMPILER_VERSION}']" PARENT_SCOPE)
+  set(OPENMP_TEST_COMPILER_FEATURES "['${comp}', '${comp}-${OPENMP_TEST_COMPILER_VERSION_MAJOR}', '${comp}-${OPENMP_TEST_COMPILER_VERSION_MAJOR_MINOR}', '${comp}-${OPENMP_TEST_COMPILER_VERSION}']" PARENT_SCOPE)
 endfunction()
 set_test_compiler_features()
 

openmp/runtime/test/worksharing/for/kmp_doacross_check.c

@@ -1,4 +1,10 @@
 // RUN: %libomp-compile-and-run
+// UNSUPPORTED: gcc
+// This test is incompatible with gcc because of the explicit call to
+// __kmpc_doacross_fini().  gcc relies on an implicit call to this function
+// when the last iteration is executed inside the GOMP_loop_*_next() functions.
+// Hence, in gcc, having the explicit call leads to __kmpc_doacross_fini()
+// being called twice.
 #include <stdio.h>
 
 #define N   1000

openmp/runtime/test/worksharing/for/omp_doacross.c

@@ -0,0 +1,60 @@
+// RUN: %libomp-compile-and-run
+// XFAIL: gcc-4, gcc-5, clang-3.7, clang-3.8, icc-15, icc-16
+#include <stdio.h>
+#include <stdlib.h>
+#include "omp_testsuite.h"
+
+#ifndef N
+#define N 750
+#endif
+
+int test_doacross() {
+  int i, j;
+  // Allocate and zero out the matrix
+  int *m = (int *)malloc(sizeof(int) * N * N);
+  for (i = 0; i < N; ++i) {
+    for (j = 0; j < N; ++j) {
+      m[i * N + j] = 0;
+    }
+  }
+  // Have first row and column be 0, 1, 2, 3, etc.
+  for (i = 0; i < N; ++i)
+    m[i * N] = i;
+  for (j = 0; j < N; ++j)
+    m[j] = j;
+  // Perform wavefront which results in matrix:
+  // 0 1 2 3 4
+  // 1 2 3 4 5
+  // 2 3 4 5 6
+  // 3 4 5 6 7
+  // 4 5 6 7 8
+  #pragma omp parallel shared(m)
+  {
+    int row, col;
+    #pragma omp for ordered(2)
+    for (row = 1; row < N; ++row) {
+      for (col = 1; col < N; ++col) {
+        #pragma omp ordered depend(sink : row - 1, col) depend(sink : row, col - 1)
+        m[row * N + col] = m[(row - 1) * N + col] + m[row * N + (col - 1)] -
+                           m[(row - 1) * N + (col - 1)];
+        #pragma omp ordered depend(source)
+      }
+    }
+  }
+
+  // Check the bottom right element to see if iteration dependencies were held
+  int retval = (m[(N - 1) * N + N - 1] == 2 * (N - 1));
+  free(m);
+  return retval;
+}
+
+int main(int argc, char **argv) {
+  int i;
+  int num_failed = 0;
+  for (i = 0; i < REPETITIONS; i++) {
+    if (!test_doacross()) {
+      num_failed++;
+    }
+  }
+  return num_failed;
+}