clang/test/OpenMP/remarks_parallel_in_target_state_machine.c

   1 // RUN: %clang_cc1                                 -verify=host -Rpass=openmp-opt -Rpass-analysis=openmp-opt -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm-bc %s -o %t-ppc-host.bc
   2 // RUN: %clang_cc1 -verify      -Rpass=openmp-opt -Rpass-analysis=openmp-opt -fopenmp -O2 -x c++ -triple nvptx64-unknown-unknown -fopenmp-targets=nvptx64-nvidia-cuda -emit-llvm %s -fopenmp-is-target-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o %t.out
   3
   4 // host-no-diagnostics
   5
   6 [[omp::assume("omp_no_openmp")]] void baz(void);
   7
   8 void bar(void) {
   9 #pragma omp parallel // #1                                                                                                                                                                                                                                                                                                                                           \
  10                      // expected-remark@#1 {{Parallel region is used in unknown ways. Will not attempt to rewrite the state machine. [OMP101]}}
  11   {
  12   }
  13 }
  14
  15 void foo(void) {
  16 #pragma omp target teams // #2
  17                          // expected-remark@#2 {{Rewriting generic-mode kernel with a customized state machine. [OMP131]}}
  18   {
  19     baz();               // expected-remark {{Value has potential side effects preventing SPMD-mode execution. Add `[[omp::assume("ompx_spmd_amenable")]]` to the called function to override. [OMP121]}}
  20 #pragma omp parallel
  21     {
  22     }
  23     bar();
  24 #pragma omp parallel
  25     {
  26     }
  27   }
  28 }
  29
  30 void spmd(void) {
  31   // Verify we do not emit the remarks above for "SPMD" regions.
  32 #pragma omp target teams
  33 #pragma omp parallel
  34   {
  35   }
  36
  37 #pragma omp target teams distribute parallel for
  38   for (int i = 0; i < 100; ++i) {
  39   }
  40 }
  41
  42 #pragma omp begin declare target device_type(nohost)
  43 struct KernelEnvironmentTy;
  44 struct KernelLaunchEnvironmentTy;
  45 __attribute__((weak))
  46 extern "C" int __kmpc_target_init(struct KernelEnvironmentTy *, struct KernelLaunchEnvironmentTy *) { // expected-remark {{Could not internalize function. Some optimizations may not be possible. [OMP140]}}
  47   return 0;
  48 }
  49 #pragma omp end declare target
  50
  51 // expected-remark@* {{OpenMP runtime call __kmpc_global_thread_num deduplicated. [OMP170]}}