[flang-commits] [flang] [llvm] [mlir] [flang][OpenMP] Add basic support to lower `loop` directive to MLIR (PR #114199)

[Sergio Afonso via flang-commits]

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+! This test checks lowering of OpenMP loop Directive.
+
+! RUN: bbc -emit-hlfir -fopenmp -fopenmp-version=50 -o - %s 2>&1 | FileCheck %s
+! RUN: %flang_fc1 -emit-hlfir -fopenmp -fopenmp-version=50 -o - %s 2>&1 | FileCheck %s
+
+! CHECK: omp.declare_reduction @[[RED:add_reduction_i32]] : i32
+! CHECK: omp.private {type = private} @[[DUMMY_PRIV:.*test_privateEdummy_private.*]] : !fir.ref<i32>
+! CHECK: omp.private {type = private} @[[I_PRIV:.*test_no_clausesEi.*]] : !fir.ref<i32>
+
+! CHECK-LABEL: func.func @_QPtest_no_clauses
+subroutine test_no_clauses()
+  integer :: i, j, dummy = 1
+
+  ! CHECK: omp.loop private(@[[I_PRIV]] %{{.*}}#0 -> %[[ARG:.*]] : !fir.ref<i32>) {
+  ! CHECK:   omp.loop_nest (%[[IV:.*]]) : i32 = (%{{.*}}) to (%{{.*}}) {{.*}} {
+  ! CHECK:     %[[ARG_DECL:.*]]:2 = hlfir.declare %[[ARG]]
+  ! CHECK:     fir.store %[[IV]] to %[[ARG_DECL]]#1 : !fir.ref<i32>
+  ! CHECK:   }
+  ! CHECK: }
+  !$omp loop
+  do i=1,10
+   dummy = dummy + 1
+  end do
+  !$omp end loop
+end subroutine
+
+! CHECK-LABEL: func.func @_QPtest_collapse
+subroutine test_collapse()
+  integer :: i, j, dummy = 1
+  ! CHECK: omp.loop private(@{{.*}} %{{.*}}#0 -> %{{.*}}, @{{.*}} %{{.*}}#0 -> %{{.*}} : {{.*}}) {
+  ! CHECK:   omp.loop_nest (%{{.*}}, %{{.*}}) : i32 {{.*}} {
+  ! CHECK:   }
+  ! CHECK: }
+  !$omp loop collapse(2)
+  do i=1,10
+    do j=2,20
+     dummy = dummy + 1
+    end do
+  end do
+  !$omp end loop
+end subroutine
+
+! CHECK-LABEL: func.func @_QPtest_private
+subroutine test_private()
+  integer :: i, dummy = 1
+  ! CHECK: omp.loop private(@[[DUMMY_PRIV]] %{{.*}}#0 -> %{{.*}}, @{{.*}} %{{.*}}#0 -> %{{.*}} : {{.*}}) {
+  ! CHECK:   omp.loop_nest (%{{.*}}) : i32 = (%{{.*}}) to (%{{.*}}) {{.*}} {
+  ! CHECK:   }
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skatrak wrote:

Check that the private copy is the one being accessed in the body.

https://github.com/llvm/llvm-project/pull/114199