[flang] Support polymorphic inputs for CSHIFT intrinsic

[clementval]

Summary

Result must carry the polymorphic type information from the array.

[jeanPerier]

LGTM

flang/lib/Optimizer/Builder/IntrinsicCall.cpp

IntrinsicLibrary::genCshift(mlir::Type resultType,
 
   // Handle required ARRAY argument
   fir::BoxValue arrayBox = builder.createBox(loc, args[0]);
   mlir::Value array = fir::getBase(arrayBox);
   unsigned arrayRank = arrayBox.rank();
 
   // Create mutable fir.box to be passed to the runtime for the result.
   mlir::Type resultArrayType = builder.getVarLenSeqTy(resultType, arrayRank);
-  fir::MutableBoxValue resultMutableBox =
-      fir::factory::createTempMutableBox(builder, loc, resultArrayType);
+  fir::MutableBoxValue resultMutableBox = fir::factory::createTempMutableBox(
+      builder, loc, resultArrayType, {},
+      fir::isPolymorphicType(array.getType()) ? array : mlir::Value{});
   mlir::Value resultIrBox =
       fir::factory::getMutableIRBox(builder, loc, resultMutableBox);
 
   if (arrayRank == 1) {
     // Vector case
     // Handle required SHIFT argument as a scalar
     const mlir::Value *shiftAddr = args[1].getUnboxed();
     assert(shiftAddr && "nonscalar CSHIFT argument");

flang/test/Lower/polymorphic-temp.f90

 ! CHECK: %[[ZERO:.*]] = fir.zero_bits !fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>
 ! CHECK: %[[EMBOX_RES:.*]] = fir.embox %[[ZERO]](%{{.*}}) source_box %[[I]] : (!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>, !fir.shape<1>, !fir.class<!fir.array<20x20x!fir.type<_QMpoly_tmpTp1{a:i32}>>>) -> !fir.class<!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>>
 ! CHECK: fir.store %[[EMBOX_RES]] to %[[TMP_RES]] : !fir.ref<!fir.class<!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>>>
 ! CHECK: %[[RES_BOX_NONE:.*]] = fir.convert %[[TMP_RES]] : (!fir.ref<!fir.class<!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>>>) -> !fir.ref<!fir.box<none>>
 ! CHECK: %[[I_BOX_NONE:.*]] = fir.convert %[[I]] : (!fir.class<!fir.array<20x20x!fir.type<_QMpoly_tmpTp1{a:i32}>>>) -> !fir.box<none>
 ! CHECK: %[[MASK_BOX_NONE:.*]] = fir.convert %[[EMBOXED_MASK]] : (!fir.box<!fir.array<20x20x!fir.logical<4>>>) -> !fir.box<none>
 ! CHECK: %{{.*}} = fir.call @_FortranAPack(%[[RES_BOX_NONE]], %[[I_BOX_NONE]], %[[MASK_BOX_NONE]], %{{.*}}, %{{.*}}, %{{.*}}) {{.*}} : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.box<none>, !fir.box<none>, !fir.ref<i8>, i32) -> none
 
+  subroutine check_cshift(r)
+    class(p1) :: r(:)
+  end subroutine
+
+  subroutine test_temp_from_intrinsic_cshift(a, shift)
+    class(p1), intent(in) :: a(20)
+    integer :: shift
+
+    call check_pack(cshift(a, shift))
+  end subroutine
+
+! CHECK-LABEL: func.func @_QMpoly_tmpPtest_temp_from_intrinsic_cshift(
+! CHECK-SAME: %[[ARRAY:.*]]: !fir.class<!fir.array<20x!fir.type<_QMpoly_tmpTp1{a:i32}>>> {fir.bindc_name = "a"}, %[[SHIFT:.*]]: !fir.ref<i32> {fir.bindc_name = "shift"}) {
+! CHECK: %[[TMP_RES:.*]] = fir.alloca !fir.class<!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>>
+! CHECK: %[[LOAD_SHIFT:.*]] = fir.load %[[SHIFT]] : !fir.ref<i32>
+! CHECK: %[[RES_BOX_NONE:.*]] = fir.convert %[[TMP_RES]] : (!fir.ref<!fir.class<!fir.heap<!fir.array<?x!fir.type<_QMpoly_tmpTp1{a:i32}>>>>>) -> !fir.ref<!fir.box<none>>
+! CHECK: %[[ARRAY_NONE:.*]] = fir.convert %[[ARRAY]] : (!fir.class<!fir.array<20x!fir.type<_QMpoly_tmpTp1{a:i32}>>>) -> !fir.box<none>
+! CHECK: %[[SHIFT_I64:.*]] = fir.convert %[[LOAD_SHIFT]] : (i32) -> i64
+! CHECK: %{{.*}} = fir.call @_FortranACshiftVector(%[[RES_BOX_NONE]], %[[ARRAY_NONE]], %[[SHIFT_I64]], %{{.*}}, %{{.*}}) {{.*}} : (!fir.ref<!fir.box<none>>, !fir.box<none>, i64, !fir.ref<i8>, i32) -> none
+
 end module