[flang][NFC] Add derived type lowering tests

[clementval]

Summary

Add more use cases of lowering of derived types.

This patch is part of the upstreaming effort from fir-dev branch.

[PeteSteinfeld]

All builds and tests correctly and looks good.

flang/test/Lower/derived-allocatable-components.f90

+! Test lowering of allocatable components
+! RUN: bbc -emit-fir %s -o - | FileCheck %s
+
+module acomp
+  implicit none
+  type t
+    real :: x
+    integer :: i
+  end type
+  interface
+    subroutine takes_real_scalar(x)
+      real :: x
+    end subroutine
+    subroutine takes_char_scalar(x)
+      character(*) :: x
+    end subroutine
+    subroutine takes_derived_scalar(x)
+      import t
+      type(t) :: x
+    end subroutine
+    subroutine takes_real_array(x)
+      real :: x(:)
+    end subroutine
+    subroutine takes_char_array(x)
+      character(*) :: x(:)
+    end subroutine
+    subroutine takes_derived_array(x)
+      import t
+      type(t) :: x(:)
+    end subroutine
+    subroutine takes_real_scalar_pointer(x)
+      real, allocatable :: x
+    end subroutine
+    subroutine takes_real_array_pointer(x)
+      real, allocatable :: x(:)
+    end subroutine
+    subroutine takes_logical(x)
+      logical :: x
+    end subroutine
+  end interface
+
+  type real_a0
+    real, allocatable :: p
+  end type
+  type real_a1
+    real, allocatable :: p(:)
+  end type
+  type cst_char_a0
+    character(10), allocatable :: p
+  end type
+  type cst_char_a1
+    character(10), allocatable :: p(:)
+  end type
+  type def_char_a0
+    character(:), allocatable :: p
+  end type
+  type def_char_a1
+    character(:), allocatable :: p(:)
+  end type
+  type derived_a0
+    type(t), allocatable :: p
+  end type
+  type derived_a1
+    type(t), allocatable :: p(:)
+  end type
+
+  real, target :: real_target, real_array_target(100)
+  character(10), target :: char_target, char_array_target(100)
+
+contains
+
+! -----------------------------------------------------------------------------
+!            Test allocatable component references
+! -----------------------------------------------------------------------------
+
+! CHECK-LABEL: func @_QMacompPref_scalar_real_a(
+! CHECK-SAME: %[[arg0:.*]]: !fir.ref<!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>{{.*}}, %[[arg1:.*]]: !fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>{{.*}}, %[[arg2:.*]]: !fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>>{{.*}}, %[[arg3:.*]]: !fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>>{{.*}}) {
+subroutine ref_scalar_real_a(a0_0, a1_0, a0_1, a1_1)
+  type(real_a0) :: a0_0, a0_1(100)
+  type(real_a1) :: a1_0, a1_1(100)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[arg0]], %[[fld]] : (!fir.ref<!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<f32>>>
+  ! CHECK: %[[load:.*]] = fir.load %[[coor]] : !fir.ref<!fir.box<!fir.heap<f32>>>
+  ! CHECK: %[[addr:.*]] = fir.box_addr %[[load]] : (!fir.box<!fir.heap<f32>>) -> !fir.heap<f32>
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]] : (!fir.heap<f32>) -> !fir.ref<f32>
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[cast]]) : (!fir.ref<f32>) -> ()
+  call takes_real_scalar(a0_0%p)
+
+  ! CHECK: %[[a0_1_coor:.*]] = fir.coordinate_of %[[arg2]], %{{.*}} : (!fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>>, i64) -> !fir.ref<!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>
+  ! CHECK: %[[fld:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_1_coor]], %[[fld]] : (!fir.ref<!fir.type<_QMacompTreal_a0{p:!fir.box<!fir.heap<f32>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<f32>>>
+  ! CHECK: %[[load:.*]] = fir.load %[[coor]] : !fir.ref<!fir.box<!fir.heap<f32>>>
+  ! CHECK: %[[addr:.*]] = fir.box_addr %[[load]] : (!fir.box<!fir.heap<f32>>) -> !fir.heap<f32>
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]] : (!fir.heap<f32>) -> !fir.ref<f32>
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[cast]]) : (!fir.ref<f32>) -> ()
+  call takes_real_scalar(a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[arg1]], %[[fld]] : (!fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+  ! CHECK-DAG: %[[addr:.*]] = fir.box_addr %[[box]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>) -> !fir.heap<!fir.array<?xf32>>
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}} : (!fir.box<!fir.heap<!fir.array<?xf32>>>, index) -> (index, index, index)
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[addr]], %[[index]] : (!fir.heap<!fir.array<?xf32>>, i64) -> !fir.ref<f32>
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[coor]]) : (!fir.ref<f32>) -> ()
+  call takes_real_scalar(a1_0%p(7))
+
+  ! CHECK: %[[a1_1_coor:.*]] = fir.coordinate_of %[[arg3]], %{{.*}} : (!fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>>, i64) -> !fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>
+  ! CHECK: %[[fld:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_1_coor]], %[[fld]] : (!fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+  ! CHECK-DAG: %[[addr:.*]] = fir.box_addr %[[box]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>) -> !fir.heap<!fir.array<?xf32>>
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}} : (!fir.box<!fir.heap<!fir.array<?xf32>>>, index) -> (index, index, index)
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[addr]], %[[index]] : (!fir.heap<!fir.array<?xf32>>, i64) -> !fir.ref<f32>
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[coor]]) : (!fir.ref<f32>) -> ()
+  call takes_real_scalar(a1_1(5)%p(7))
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPref_array_real_a(
+! CHECK-SAME:        %[[VAL_0:.*]]: !fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>{{.*}}, %[[VAL_1:.*]]: !fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>>{{.*}}) {
+! CHECK:         %[[VAL_2:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>
+! CHECK:         %[[VAL_3:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_2]] : (!fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+! CHECK:         %[[VAL_4:.*]] = fir.load %[[VAL_3]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+! CHECK:         %[[VAL_5:.*]] = arith.constant 0 : index
+! CHECK:         %[[VAL_6:.*]]:3 = fir.box_dims %[[VAL_4]], %[[VAL_5]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>, index) -> (index, index, index)
+! CHECK:         %[[VAL_7:.*]] = fir.box_addr %[[VAL_4]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>) -> !fir.heap<!fir.array<?xf32>>
+! CHECK:         %[[VAL_8:.*]] = arith.constant 20 : i64
+! CHECK:         %[[VAL_9:.*]] = fir.convert %[[VAL_8]] : (i64) -> index
+! CHECK:         %[[VAL_10:.*]] = arith.constant 2 : i64
+! CHECK:         %[[VAL_11:.*]] = fir.convert %[[VAL_10]] : (i64) -> index
+! CHECK:         %[[VAL_12:.*]] = arith.constant 50 : i64
+! CHECK:         %[[VAL_13:.*]] = fir.convert %[[VAL_12]] : (i64) -> index
+! CHECK:         %[[VAL_14:.*]] = fir.shape_shift %[[VAL_6]]#0, %[[VAL_6]]#1 : (index, index) -> !fir.shapeshift<1>
+! CHECK:         %[[VAL_15:.*]] = fir.slice %[[VAL_9]], %[[VAL_13]], %[[VAL_11]] : (index, index, index) -> !fir.slice<1>
+! CHECK:         %[[VAL_16:.*]] = fir.embox %[[VAL_7]](%[[VAL_14]]) {{\[}}%[[VAL_15]]] : (!fir.heap<!fir.array<?xf32>>, !fir.shapeshift<1>, !fir.slice<1>) -> !fir.box<!fir.array<?xf32>>
+! CHECK:         fir.call @_QPtakes_real_array(%[[VAL_16]]) : (!fir.box<!fir.array<?xf32>>) -> ()
+! CHECK:         %[[VAL_17:.*]] = arith.constant 5 : i64
+! CHECK:         %[[VAL_18:.*]] = arith.constant 1 : i64
+! CHECK:         %[[VAL_19:.*]] = arith.subi %[[VAL_17]], %[[VAL_18]] : i64
+! CHECK:         %[[VAL_20:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_19]] : (!fir.ref<!fir.array<100x!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>>, i64) -> !fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>
+! CHECK:         %[[VAL_21:.*]] = fir.field_index p, !fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>
+! CHECK:         %[[VAL_22:.*]] = fir.coordinate_of %[[VAL_20]], %[[VAL_21]] : (!fir.ref<!fir.type<_QMacompTreal_a1{p:!fir.box<!fir.heap<!fir.array<?xf32>>>}>>, !fir.field) -> !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+! CHECK:         %[[VAL_23:.*]] = fir.load %[[VAL_22]] : !fir.ref<!fir.box<!fir.heap<!fir.array<?xf32>>>>
+! CHECK:         %[[VAL_24:.*]] = arith.constant 0 : index
+! CHECK:         %[[VAL_25:.*]]:3 = fir.box_dims %[[VAL_23]], %[[VAL_24]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>, index) -> (index, index, index)
+! CHECK:         %[[VAL_26:.*]] = fir.box_addr %[[VAL_23]] : (!fir.box<!fir.heap<!fir.array<?xf32>>>) -> !fir.heap<!fir.array<?xf32>>
+! CHECK:         %[[VAL_27:.*]] = arith.constant 20 : i64
+! CHECK:         %[[VAL_28:.*]] = fir.convert %[[VAL_27]] : (i64) -> index
+! CHECK:         %[[VAL_29:.*]] = arith.constant 2 : i64
+! CHECK:         %[[VAL_30:.*]] = fir.convert %[[VAL_29]] : (i64) -> index
+! CHECK:         %[[VAL_31:.*]] = arith.constant 50 : i64
+! CHECK:         %[[VAL_32:.*]] = fir.convert %[[VAL_31]] : (i64) -> index
+! CHECK:         %[[VAL_33:.*]] = fir.shape_shift %[[VAL_25]]#0, %[[VAL_25]]#1 : (index, index) -> !fir.shapeshift<1>
+! CHECK:         %[[VAL_34:.*]] = fir.slice %[[VAL_28]], %[[VAL_32]], %[[VAL_30]] : (index, index, index) -> !fir.slice<1>
+! CHECK:         %[[VAL_35:.*]] = fir.embox %[[VAL_26]](%[[VAL_33]]) {{\[}}%[[VAL_34]]] : (!fir.heap<!fir.array<?xf32>>, !fir.shapeshift<1>, !fir.slice<1>) -> !fir.box<!fir.array<?xf32>>
+! CHECK:         fir.call @_QPtakes_real_array(%[[VAL_35]]) : (!fir.box<!fir.array<?xf32>>) -> ()
+! CHECK:         return
+! CHECK:       }
+
+subroutine ref_array_real_a(a1_0, a1_1)
+  type(real_a1) :: a1_0, a1_1(100)
+  call takes_real_array(a1_0%p(20:50:2))
+  call takes_real_array(a1_1(5)%p(20:50:2))
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPref_scalar_cst_char_a
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine ref_scalar_cst_char_a(a0_0, a1_0, a0_1, a1_1)
+  type(cst_char_a0) :: a0_0, a0_1(100)
+  type(cst_char_a1) :: a1_0, a1_1(100)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[addr:.*]] = fir.box_addr %[[box]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %c10{{.*}}
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[addr:.*]] = fir.box_addr %[[box]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %c10{{.*}}
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a0_1(5)%p)
+
+
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[base:.*]] = fir.box_addr %[[box]]
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[base]], %[[index]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %c10{{.*}}
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a1_0%p(7))
+
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[base:.*]] = fir.box_addr %[[box]]
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[base]], %[[index]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %c10{{.*}}
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a1_1(5)%p(7))
+
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPref_scalar_def_char_a
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine ref_scalar_def_char_a(a0_0, a1_0, a0_1, a1_1)
+  type(def_char_a0) :: a0_0, a0_1(100)
+  type(def_char_a1) :: a1_0, a1_1(100)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[len:.*]] = fir.box_elesize %[[box]]
+  ! CHECK-DAG: %[[addr:.*]] = fir.box_addr %[[box]]
+  ! CHECK-DAG: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %[[len]]
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[len:.*]] = fir.box_elesize %[[box]]
+  ! CHECK-DAG: %[[addr:.*]] = fir.box_addr %[[box]]
+  ! CHECK-DAG: %[[cast:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cast]], %[[len]]
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a0_1(5)%p)
+
+
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK-DAG: %[[len:.*]] = fir.box_elesize %[[box]]
+  ! CHECK-DAG: %[[base:.*]] = fir.box_addr %[[box]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[base]] : (!fir.heap<!fir.array<?x!fir.char<1,?>>>) -> !fir.ref<!fir.array<?x!fir.char<1,?>>>
+  ! CHECK: %[[c7:.*]] = fir.convert %c7{{.*}} : (i64) -> index 
+  ! CHECK: %[[sub:.*]] = arith.subi %[[c7]], %[[dims]]#0 : index 
+  ! CHECK: %[[mul:.*]] = arith.muli %[[len]], %[[sub]] : index 
+  ! CHECK: %[[offset:.*]] = arith.addi %[[mul]], %c0{{.*}} : index
+  ! CHECK: %[[cnvt:.*]] = fir.convert %[[cast]]
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[cnvt]], %[[offset]]
+  ! CHECK: %[[cnvt:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cnvt]], %[[len]]
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a1_0%p(7))
+
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK-DAG: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK-DAG: %[[len:.*]] = fir.box_elesize %[[box]]
+  ! CHECK-DAG: %[[base:.*]] = fir.box_addr %[[box]]
+  ! CHECK: %[[cast:.*]] = fir.convert %[[base]] : (!fir.heap<!fir.array<?x!fir.char<1,?>>>) -> !fir.ref<!fir.array<?x!fir.char<1,?>>>
+  ! CHECK: %[[c7:.*]] = fir.convert %c7{{.*}} : (i64) -> index 
+  ! CHECK: %[[sub:.*]] = arith.subi %[[c7]], %[[dims]]#0 : index 
+  ! CHECK: %[[mul:.*]] = arith.muli %[[len]], %[[sub]] : index 
+  ! CHECK: %[[offset:.*]] = arith.addi %[[mul]], %c0{{.*}} : index
+  ! CHECK: %[[cnvt:.*]] = fir.convert %[[cast]]
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[cnvt]], %[[offset]]
+  ! CHECK: %[[cnvt:.*]] = fir.convert %[[addr]]
+  ! CHECK: %[[boxchar:.*]] = fir.emboxchar %[[cnvt]], %[[len]]
+  ! CHECK: fir.call @_QPtakes_char_scalar(%[[boxchar]])
+  call takes_char_scalar(a1_1(5)%p(7))
+
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPref_scalar_derived
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine ref_scalar_derived(a0_0, a1_0, a0_1, a1_1)
+  type(derived_a0) :: a0_0, a0_1(100)
+  type(derived_a1) :: a1_0, a1_1(100)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[fldx:.*]] = fir.field_index x
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[box]], %[[fldx]]
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[addr]])
+  call takes_real_scalar(a0_0%p%x)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[fldx:.*]] = fir.field_index x
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[box]], %[[fldx]]
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[addr]])
+  call takes_real_scalar(a0_1(5)%p%x)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[elem:.*]] = fir.coordinate_of %[[box]], %[[index]]
+  ! CHECK: %[[fldx:.*]] = fir.field_index x
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[elem]], %[[fldx]]
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[addr]])
+  call takes_real_scalar(a1_0%p(7)%x)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: %[[dims:.*]]:3 = fir.box_dims %[[box]], %c0{{.*}}
+  ! CHECK: %[[lb:.*]] = fir.convert %[[dims]]#0 : (index) -> i64
+  ! CHECK: %[[index:.*]] = arith.subi %c7{{.*}}, %[[lb]] : i64
+  ! CHECK: %[[elem:.*]] = fir.coordinate_of %[[box]], %[[index]]
+  ! CHECK: %[[fldx:.*]] = fir.field_index x
+  ! CHECK: %[[addr:.*]] = fir.coordinate_of %[[elem]], %[[fldx]]
+  ! CHECK: fir.call @_QPtakes_real_scalar(%[[addr]])
+  call takes_real_scalar(a1_1(5)%p(7)%x)
+
+end subroutine
+
+! -----------------------------------------------------------------------------
+!            Test passing allocatable component references as allocatables
+! -----------------------------------------------------------------------------
+
+! CHECK-LABEL: func @_QMacompPpass_real_a
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine pass_real_a(a0_0, a1_0, a0_1, a1_1)
+  type(real_a0) :: a0_0, a0_1(100)
+  type(real_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: fir.call @_QPtakes_real_scalar_pointer(%[[coor]])
+  call takes_real_scalar_pointer(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.call @_QPtakes_real_scalar_pointer(%[[coor]])
+  call takes_real_scalar_pointer(a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: fir.call @_QPtakes_real_array_pointer(%[[coor]])
+  call takes_real_array_pointer(a1_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.call @_QPtakes_real_array_pointer(%[[coor]])
+  call takes_real_array_pointer(a1_1(5)%p)
+end subroutine
+
+! -----------------------------------------------------------------------------
+!            Test usage in intrinsics where pointer aspect matters
+! -----------------------------------------------------------------------------
+
+! CHECK-LABEL: func @_QMacompPallocated_p
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine allocated_p(a0_0, a1_0, a0_1, a1_1)
+  type(real_a0) :: a0_0, a0_1(100)
+  type(def_char_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: fir.box_addr %[[box]]
+  call takes_logical(allocated(a0_0%p))
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: fir.box_addr %[[box]]
+  call takes_logical(allocated(a0_1(5)%p))
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: fir.box_addr %[[box]]
+  call takes_logical(allocated(a1_0%p))
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: %[[box:.*]] = fir.load %[[coor]]
+  ! CHECK: fir.box_addr %[[box]]
+  call takes_logical(allocated(a1_1(5)%p))
+end subroutine
+
+! -----------------------------------------------------------------------------
+!            Test allocation
+! -----------------------------------------------------------------------------
+
+! CHECK-LABEL: func @_QMacompPallocate_real
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine allocate_real(a0_0, a1_0, a0_1, a1_1)
+  type(real_a0) :: a0_0, a0_1(100)
+  type(real_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a1_0%p(100))
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a1_1(5)%p(100))
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPallocate_cst_char
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine allocate_cst_char(a0_0, a1_0, a0_1, a1_1)
+  type(cst_char_a0) :: a0_0, a0_1(100)
+  type(cst_char_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a1_0%p(100))
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(a1_1(5)%p(100))
+end subroutine
+
+! CHECK-LABEL: func @_QMacompPallocate_def_char
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine allocate_def_char(a0_0, a1_0, a0_1, a1_1)
+  type(def_char_a0) :: a0_0, a0_1(100)
+  type(def_char_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(character(18)::a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(character(18)::a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(character(18)::a1_0%p(100))
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  allocate(character(18)::a1_1(5)%p(100))
+end subroutine
+
+! -----------------------------------------------------------------------------
+!            Test deallocation
+! -----------------------------------------------------------------------------
+
+! CHECK-LABEL: func @_QMacompPdeallocate_real
+! CHECK-SAME: (%[[a0_0:.*]]: {{.*}}, %[[a1_0:.*]]: {{.*}}, %[[a0_1:.*]]: {{.*}}, %[[a1_1:.*]]: {{.*}})
+subroutine deallocate_real(a0_0, a1_0, a0_1, a1_1)
+  type(real_a0) :: a0_0, a0_1(100)
+  type(real_a1) :: a1_0, a1_1(100)
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a0_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  deallocate(a0_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a0_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  deallocate(a0_1(5)%p)
+
+  ! CHECK: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[a1_0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  deallocate(a1_0%p)
+
+  ! CHECK-DAG: %[[coor0:.*]] = fir.coordinate_of %[[a1_1]], %{{.*}}
+  ! CHECK-DAG: %[[fld:.*]] = fir.field_index p
+  ! CHECK: %[[coor:.*]] = fir.coordinate_of %[[coor0]], %[[fld]]
+  ! CHECK: fir.store {{.*}} to %[[coor]]
+  deallocate(a1_1(5)%p)
+end subroutine
+
+! -----------------------------------------------------------------------------
+!            Test a recursive derived type reference
+! -----------------------------------------------------------------------------
+
+! CHECK: func @_QMacompPtest_recursive
+! CHECK-SAME: (%[[x:.*]]: {{.*}})
+subroutine test_recursive(x)
+  type t
+    integer :: i
+    type(t), allocatable :: next
+  end type
+  type(t) :: x
+
+  ! CHECK: %[[fldNext1:.*]] = fir.field_index next
+  ! CHECK: %[[next1:.*]] = fir.coordinate_of %[[x]], %[[fldNext1]]
+  ! CHECK: %[[nextBox1:.*]] = fir.load %[[next1]]
+  ! CHECK: %[[fldNext2:.*]] = fir.field_index next
+  ! CHECK: %[[next2:.*]] = fir.coordinate_of %[[nextBox1]], %[[fldNext2]]
+  ! CHECK: %[[nextBox2:.*]] = fir.load %[[next2]]
+  ! CHECK: %[[fldNext3:.*]] = fir.field_index next
+  ! CHECK: %[[next3:.*]] = fir.coordinate_of %[[nextBox2]], %[[fldNext3]]
+  ! CHECK: %[[nextBox3:.*]] = fir.load %[[next3]]
+  ! CHECK: %[[fldi:.*]] = fir.field_index i
+  ! CHECK: %[[i:.*]] = fir.coordinate_of %[[nextBox3]], %[[fldi]]
+  ! CHECK: %[[nextBox3:.*]] = fir.load %[[i]] : !fir.ref<i32>
+  print *, x%next%next%next%i
+end subroutine
+
+end module

flang/test/Lower/derived-assignments.f90

+! Test lowering of derived type assignments
+! RUN: bbc -emit-fir %s -o - | FileCheck %s
+
+! Assignment of simple "struct" with trivial intrinsic members.
+! CHECK-LABEL: func @_QPtest1
+subroutine test1
+  type t
+     integer a
+     integer b
+  end type t
+  type(t) :: t1, t2
+  ! CHECK-DAG:  %[[VAL_0:.*]] = fir.alloca !fir.type<_QFtest1Tt{a:i32,b:i32}> {{{.*}}uniq_name = "_QFtest1Et1"}
+  ! CHECK-DAG:  %[[VAL_1:.*]] = fir.alloca !fir.type<_QFtest1Tt{a:i32,b:i32}> {{{.*}}uniq_name = "_QFtest1Et2"}
+  ! CHECK:  %[[VAL_2:.*]] = fir.field_index a, !fir.type<_QFtest1Tt{a:i32,b:i32}>
+  ! CHECK:  %[[VAL_3:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest1Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_4:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest1Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_5:.*]] = fir.load %[[VAL_3]] : !fir.ref<i32>
+  ! CHECK:  fir.store %[[VAL_5]] to %[[VAL_4]] : !fir.ref<i32>
+  ! CHECK:  %[[VAL_6:.*]] = fir.field_index b, !fir.type<_QFtest1Tt{a:i32,b:i32}>
+  ! CHECK:  %[[VAL_7:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_6]] : (!fir.ref<!fir.type<_QFtest1Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_8:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_6]] : (!fir.ref<!fir.type<_QFtest1Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_9:.*]] = fir.load %[[VAL_7]] : !fir.ref<i32>
+  ! CHECK:  fir.store %[[VAL_9]] to %[[VAL_8]] : !fir.ref<i32>
+  t1 = t2
+end subroutine test1
+
+! Test a defined assignment on a simple struct.
+module m2
+  type t
+     integer a
+     integer b
+  end type t
+  interface assignment (=)
+     module procedure t_to_t
+  end interface assignment (=)
+contains
+  ! CHECK-LABEL: func @_QMm2Ptest2
+  subroutine test2
+    type(t) :: t1, t2
+    ! CHECK: fir.call @_QMm2Pt_to_t(%{{.*}}, %{{.*}}) : (!fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>, !fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>) -> ()
+    t1 = t2
+    ! CHECK: return
+  end subroutine test2
+
+  ! Swap elements on assignment.
+  ! CHECK-LABEL: func @_QMm2Pt_to_t(
+  ! CHECK-SAME: %[[a1:[^:]*]]: !fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>{{.*}}, %[[b1:[^:]*]]: !fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>{{.*}}) {
+  subroutine t_to_t(a1,b1)
+    type(t), intent(out) :: a1
+    type(t), intent(in) :: b1
+    ! CHECK: %[[b:.*]] = fir.field_index b, !fir.type<_QMm2Tt{a:i32,b:i32}>
+    ! CHECK: %[[b1b:.*]] = fir.coordinate_of %[[b1]], %[[b]] : (!fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+    ! CHECK: %[[v:.*]] = fir.load %[[b1b]] : !fir.ref<i32>
+    ! CHECK: %[[a:.*]] = fir.field_index a, !fir.type<_QMm2Tt{a:i32,b:i32}>
+    ! CHECK: %[[a1a:.*]] = fir.coordinate_of %[[a1]], %[[a]] : (!fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+    ! CHECK: fir.store %[[v]] to %[[a1a]] : !fir.ref<i32>
+    ! CHECK: %[[a:.*]] = fir.field_index a, !fir.type<_QMm2Tt{a:i32,b:i32}>
+    ! CHECK: %[[b1a:.*]] = fir.coordinate_of %[[b1]], %[[a]] : (!fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+    ! CHECK: %[[v:.*]] = fir.load %[[b1a]] : !fir.ref<i32>
+    ! CHECK: %[[b:.*]] = fir.field_index b, !fir.type<_QMm2Tt{a:i32,b:i32}>
+    ! CHECK: %[[a1b:.*]] = fir.coordinate_of %[[a1]], %[[b]] : (!fir.ref<!fir.type<_QMm2Tt{a:i32,b:i32}>>, !fir.field) -> !fir.ref<i32>
+    ! CHECK: fir.store %[[v]] to %[[a1b]] : !fir.ref<i32>
+    a1%a = b1%b
+    a1%b = b1%a
+    ! CHECK: return
+  end subroutine t_to_t
+end module m2
+
+! CHECK-LABEL: func @_QPtest3
+subroutine test3
+  type t
+     character(LEN=20) :: m_c
+     integer :: m_i
+  end type t
+  type(t) :: t1, t2
+  ! CHECK-DAG:  %[[VAL_0:.*]] = fir.alloca !fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}> {{{.*}}uniq_name = "_QFtest3Et1"}
+  ! CHECK-DAG:  %[[VAL_1:.*]] = fir.alloca !fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}> {{{.*}}uniq_name = "_QFtest3Et2"}
+  ! CHECK:  %[[VAL_2:.*]] = fir.field_index m_c, !fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>
+  ! CHECK:  %[[VAL_3:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.char<1,20>>
+  ! CHECK:  %[[VAL_4:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.char<1,20>>
+  ! CHECK:  %[[VAL_5:.*]] = arith.constant 20 : index
+  ! CHECK:  %[[VAL_6:.*]] = arith.constant 1 : i64
+  ! CHECK:  %[[VAL_7:.*]] = fir.convert %[[VAL_5]] : (index) -> i64
+  ! CHECK:  %[[VAL_8:.*]] = arith.muli %[[VAL_6]], %[[VAL_7]] : i64
+  ! CHECK:  %[[VAL_9:.*]] = arith.constant false
+  ! CHECK:  %[[VAL_10:.*]] = fir.convert %[[VAL_4]] : (!fir.ref<!fir.char<1,20>>) -> !fir.ref<i8>
+  ! CHECK:  %[[VAL_11:.*]] = fir.convert %[[VAL_3]] : (!fir.ref<!fir.char<1,20>>) -> !fir.ref<i8>
+  ! CHECK:  fir.call @llvm.memmove.p0i8.p0i8.i64(%[[VAL_10]], %[[VAL_11]], %[[VAL_8]], %[[VAL_9]]) : (!fir.ref<i8>, !fir.ref<i8>, i64, i1) -> ()
+  ! CHECK:  %[[VAL_12:.*]] = fir.field_index m_i, !fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>
+  ! CHECK:  %[[VAL_13:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_12]] : (!fir.ref<!fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_14:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_12]] : (!fir.ref<!fir.type<_QFtest3Tt{m_c:!fir.char<1,20>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_15:.*]] = fir.load %[[VAL_13]] : !fir.ref<i32>
+  ! CHECK:  fir.store %[[VAL_15]] to %[[VAL_14]] : !fir.ref<i32>
+  t1 = t2
+  ! CHECK: return
+end subroutine test3
+
+! CHECK-LABEL: func @_QPtest_array_comp(
+! CHECK-SAME: %[[VAL_0:.*]]: !fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>{{.*}}, %[[VAL_1:.*]]: !fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>{{.*}}) {
+subroutine test_array_comp(t1, t2)
+  type t
+     real :: m_x(10)
+     integer :: m_i
+  end type t
+  type(t) :: t1, t2
+
+  ! CHECK:  %[[VAL_2:.*]] = fir.field_index m_x, !fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>
+  ! CHECK:  %[[VAL_3:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.array<10xf32>>
+  ! CHECK:  %[[VAL_4:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.array<10xf32>>
+  ! CHECK:  %[[VAL_5:.*]] = arith.constant 0 : index
+  ! CHECK:  %[[VAL_6:.*]] = arith.constant 1 : index
+  ! CHECK:  %[[VAL_7:.*]] = arith.constant 9 : index
+  ! CHECK:  fir.do_loop %[[VAL_8:.*]] = %[[VAL_5]] to %[[VAL_7]] step %[[VAL_6]] {
+  ! CHECK:    %[[VAL_9:.*]] = fir.coordinate_of %[[VAL_4]], %[[VAL_8]] : (!fir.ref<!fir.array<10xf32>>, index) -> !fir.ref<f32>
+  ! CHECK:    %[[VAL_10:.*]] = fir.coordinate_of %[[VAL_3]], %[[VAL_8]] : (!fir.ref<!fir.array<10xf32>>, index) -> !fir.ref<f32>
+  ! CHECK:    %[[VAL_11:.*]] = fir.load %[[VAL_10]] : !fir.ref<f32>
+  ! CHECK:    fir.store %[[VAL_11]] to %[[VAL_9]] : !fir.ref<f32>
+  ! CHECK:  }
+  ! CHECK:  %[[VAL_12:.*]] = fir.field_index m_i, !fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>
+  ! CHECK:  %[[VAL_13:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_12]] : (!fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_14:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_12]] : (!fir.ref<!fir.type<_QFtest_array_compTt{m_x:!fir.array<10xf32>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_15:.*]] = fir.load %[[VAL_13]] : !fir.ref<i32>
+  ! CHECK:  fir.store %[[VAL_15]] to %[[VAL_14]] : !fir.ref<i32>
+  t1 = t2
+end subroutine
+
+! CHECK-LABEL: func @_QPtest_ptr_comp(
+! CHECK-SAME: %[[VAL_0:.*]]: !fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>{{.*}}, %[[VAL_1]]: !fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>{{.*}}) {
+subroutine test_ptr_comp(t1, t2)
+  type t
+     complex, pointer :: ptr(:)
+     integer :: m_i
+  end type t
+  type(t) :: t1, t2
+
+  ! CHECK:  %[[VAL_2:.*]] = fir.field_index ptr, !fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>
+  ! CHECK:  %[[VAL_3:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>>
+  ! CHECK:  %[[VAL_4:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_2]] : (!fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>, !fir.field) -> !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>>
+  ! CHECK:  %[[VAL_5:.*]] = fir.load %[[VAL_3]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>>
+  ! CHECK:  fir.store %[[VAL_5]] to %[[VAL_4]] : !fir.ref<!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>>
+  ! CHECK:  %[[VAL_6:.*]] = fir.field_index m_i, !fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>
+  ! CHECK:  %[[VAL_7:.*]] = fir.coordinate_of %[[VAL_1]], %[[VAL_6]] : (!fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_8:.*]] = fir.coordinate_of %[[VAL_0]], %[[VAL_6]] : (!fir.ref<!fir.type<_QFtest_ptr_compTt{ptr:!fir.box<!fir.ptr<!fir.array<?x!fir.complex<4>>>>,m_i:i32}>>, !fir.field) -> !fir.ref<i32>
+  ! CHECK:  %[[VAL_9:.*]] = fir.load %[[VAL_7]] : !fir.ref<i32>
+  ! CHECK:  fir.store %[[VAL_9]] to %[[VAL_8]] : !fir.ref<i32>
+  t1 = t2
+end subroutine
+
+! CHECK-LABEL: func @_QPtest_box_assign(
+! CHECK-SAME: %[[t1:.*]]: !fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>{{.*}}, %[[t2:.*]]: !fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>{{.*}}) {
+subroutine test_box_assign(t1, t2)
+  type t
+     integer :: i
+  end type t
+  ! Note: the implementation of this case is not optimal, the runtime call is overkill, but right now
+  ! lowering is conservative with derived type pointers because it does not make a difference between the
+  ! polymorphic and non polymorphic ones at the FIR level.
+  type(t), pointer :: t1, t2
+  ! CHECK: %[[tmpBox:.*]] = fir.alloca !fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>
+  ! CHECK: %[[t2Load:.*]] = fir.load %[[t2]] : !fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>
+  ! CHECK: %[[t1Load:.*]] = fir.load %[[t1]] : !fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>
+  ! CHECK: fir.store %[[t1Load]] to %[[tmpBox]] : !fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>
+  ! CHECK: %[[lhs:.*]] = fir.convert %[[tmpBox]] : (!fir.ref<!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>>) -> !fir.ref<!fir.box<none>>
+  ! CHECK: %[[rhs:.*]] = fir.convert %[[t2Load]] : (!fir.box<!fir.ptr<!fir.type<_QFtest_box_assignTt{i:i32}>>>) -> !fir.box<none>
+  ! CHECK: fir.call @_FortranAAssign(%[[lhs]], %[[rhs]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.ref<i8>, i32) -> none
+  t1 = t2
+end subroutine
+
+! CHECK-LABEL: func @_QPtest_alloc_comp(
+! CHECK-SAME: %[[t1:.*]]: !fir.ref<!fir.type<_QFtest_alloc_compTt{x:!fir.box<!fir.heap<!fir.array<?x?xf32>>>,i:i32}>>{{.*}}, %[[t2:.*]]: !fir.ref<!fir.type<_QFtest_alloc_compTt{x:!fir.box<!fir.heap<!fir.array<?x?xf32>>>,i:i32}>>{{.*}}) {
+subroutine test_alloc_comp(t1, t2)
+! Test that derived type assignment with allocatable components are using the
+! runtime to handle the deep copy.
+  type t
+    real, allocatable :: x(:, :)
+    integer :: i
+  end type
+  type(t) :: t1, t2
+  ! CHECK: %[[tmpBox:.*]] = fir.alloca !fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>
+  ! CHECK: %[[t1Box:.*]] = fir.embox %[[t1]] : (!fir.ref<!fir.type<_QFtest_alloc_compTt{{.*}}>>) -> !fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>
+  ! CHECK: %[[t2Box:.*]] = fir.embox %[[t2]] : (!fir.ref<!fir.type<_QFtest_alloc_compTt{{.*}}>>) -> !fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>
+  ! CHECK: fir.store %[[t1Box]] to %[[tmpBox]] : !fir.ref<!fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>>
+  ! CHECK: %[[lhs:.*]] = fir.convert %[[tmpBox]] : (!fir.ref<!fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>>) -> !fir.ref<!fir.box<none>>
+  ! CHECK: %[[rhs:.*]] = fir.convert %[[t2Box]] : (!fir.box<!fir.type<_QFtest_alloc_compTt{{.*}}>>) -> !fir.box<none>
+  ! CHECK: fir.call @_FortranAAssign(%[[lhs]], %[[rhs]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.ref<i8>, i32) -> none
+  t1 = t2
+end subroutine
+
+! Reinstate this test when polymorphic types are more fully supported.
+!
+!module component_with_user_def_assign
+!  type t0
+!    integer :: i
+!    integer :: j
+!  contains
+!    procedure :: user_def
+!    generic :: assignment(=) => user_def
+!  end type
+!  interface
+!  subroutine user_def(other, self)
+!    import t0
+!    class(t0), intent(out) :: other
+!    class(t0), intent(in) :: self
+!  end subroutine
+!  end interface
+
+!  ! Assignments of type(t) must call the user defined assignment for component a.
+!  ! Currently this is delegated to the runtime.
+!  type t
+!    type(t0) :: a
+!    integer :: i
+!  end type
+
+!contains
+!  ! cHECK-LABEL: func @_QMcomponent_with_user_def_assignPtest(
+!  ! cHECK-SAME: %[[t1:.*]]: !fir.ref<!fir.type<_QMcomponent_with_user_def_assignTt{a:!fir.type<_QMcomponent_with_user_def_assignTt0{i:i32,j:i32}>,i:i32}>>{{.*}}, %[[t2:.*]]: !fir.ref<!fir.type<_QMcomponent_with_user_def_assignTt{a:!fir.type<_QMcomponent_with_user_def_assignTt0{i:i32,j:i32}>,i:i32}>>{{.*}}) {
+!  subroutine test(t1, t2)
+!    type(t) :: t1, t2
+!    ! cHECK: %[[tmpBox:.*]] = fir.alloca !fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>
+!    ! cHECK: %[[t1Box:.*]] = fir.embox %[[t1]] : (!fir.ref<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>) -> !fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>
+!    ! cHECK: %[[t2Box:.*]] = fir.embox %[[t2]] : (!fir.ref<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>) -> !fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>
+!    ! cHECK: fir.store %[[t1Box]] to %[[tmpBox]] : !fir.ref<!fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>>
+!    ! cHECK: %[[lhs:.*]] = fir.convert %[[tmpBox]] : (!fir.ref<!fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>>) -> !fir.ref<!fir.box<none>>
+!    ! cHECK: %[[rhs:.*]] = fir.convert %[[t2Box]] : (!fir.box<!fir.type<_QMcomponent_with_user_def_assignTt{{.*}}>>) -> !fir.box<none>
+!    ! cHECK: fir.call @_FortranAAssign(%[[lhs]], %[[rhs]], %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.box<none>, !fir.ref<i8>, i32) -> none
+!    t1 = t2
+!  end subroutine
+!end module

flang/test/Lower/derived-type-descriptor.f90

+! Test lowering of derived type descriptors builtin data
+! RUN: bbc -emit-fir %s -o - | FileCheck %s
+
+subroutine foo()
+  real, save, target :: init_values(10, 10)
+  type sometype
+    integer :: num = 42
+    real, pointer :: values(:, :) => init_values
+  end type
+  type(sometype), allocatable, save :: x(:)
+end subroutine
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.n.num constant : !fir.char<1,3> {
+! CHECK: %[[res:.*]] = fir.string_lit "num"(3) : !fir.char<1,3>
+! CHECK: fir.has_value %[[res]] : !fir.char<1,3>
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.di.sometype.num constant : i32
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.n.values constant : !fir.char<1,6> {
+! CHECK: %[[res:.*]] = fir.string_lit "values"(6) : !fir.char<1,6>
+! CHECK: fir.has_value %[[res]] : !fir.char<1,6>
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.n.sometype constant : !fir.char<1,8> {
+! CHECK: %[[res:.*]] = fir.string_lit "sometype"(8) : !fir.char<1,8>
+! CHECK: fir.has_value %[[res]] : !fir.char<1,8>
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.di.sometype.values constant : !fir.type<_QFfooT.dp.sometype.values{values:!fir.box<!fir.ptr<!fir.array<?x?xf32>>>}> {
+  ! CHECK: fir.address_of(@_QFfooEinit_values)
+! CHECK: }
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.dt.sometype constant {{.*}} {
+  !CHECK: fir.address_of(@_QFfooE.n.sometype)
+  !CHECK: fir.address_of(@_QFfooE.c.sometype)
+! CHECK:}
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFfooE.c.sometype constant {{.*}} {
+  ! CHECK: fir.address_of(@_QFfooE.n.num)
+  ! CHECK: fir.address_of(@_QFfooE.di.sometype.num) : !fir.ref<i32>
+  ! CHECK: fir.address_of(@_QFfooE.n.values)
+  ! CHECK: fir.address_of(@_QFfooE.di.sometype.values)
+! CHECK: }
+
+subroutine char_comp_init()
+  implicit none  
+  type t
+     character(8) :: name='Empty'
+  end type t
+  type(t) :: a
+end subroutine
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFchar_comp_initE.di.t.name constant : !fir.char<1,8> {
+! CHECK: %[[res:.*]] = fir.string_lit "Empty   "(8) : !fir.char<1,8>
+! CHECK: fir.has_value %[[res]] : !fir.char<1,8>
+
+! CHECK-LABEL: fir.global linkonce_odr @_QFchar_comp_initE.c.t constant : {{.*}} {
+  ! CHECK: fir.address_of(@_QFchar_comp_initE.di.t.name) : !fir.ref<!fir.char<1,8>>
+! CHECK: }