Improve handling of pointers in hierarchy_bld

amgprec/impl/amg_c_hierarchy_bld.F90

@@ -454,8 +454,13 @@ subroutine amg_c_hierarchy_bld(a,desc_a,prec,info)
     do i=2, iszv
       prec%precv(i)%base_a       => prec%precv(i)%ac
       prec%precv(i)%base_desc    => prec%precv(i)%desc_ac
-      prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      ! This is needed when the linmap object has been built
-      prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
+      ! reusing the base_desc descriptor through a pointer.
+      ! With PSBLAS 4 we will have a better solution
+      if (associated(prec%precv(i)%linmap%p_desc_U)) &
+           & prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      if (associated(prec%precv(i)%linmap%p_desc_V))&
+           & prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
     end do
   end if
 

amgprec/impl/amg_d_hierarchy_bld.F90

@@ -454,8 +454,13 @@ subroutine amg_d_hierarchy_bld(a,desc_a,prec,info)
     do i=2, iszv
       prec%precv(i)%base_a       => prec%precv(i)%ac
       prec%precv(i)%base_desc    => prec%precv(i)%desc_ac
-      prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      ! This is needed when the linmap object has been built
-      prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
+      ! reusing the base_desc descriptor through a pointer.
+      ! With PSBLAS 4 we will have a better solution
+      if (associated(prec%precv(i)%linmap%p_desc_U)) &
+           & prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      if (associated(prec%precv(i)%linmap%p_desc_V))&
+           & prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
     end do
   end if
 

amgprec/impl/amg_s_hierarchy_bld.F90

@@ -454,8 +454,13 @@ subroutine amg_s_hierarchy_bld(a,desc_a,prec,info)
     do i=2, iszv
       prec%precv(i)%base_a       => prec%precv(i)%ac
       prec%precv(i)%base_desc    => prec%precv(i)%desc_ac
-      prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      ! This is needed when the linmap object has been built
-      prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
+      ! reusing the base_desc descriptor through a pointer.
+      ! With PSBLAS 4 we will have a better solution
+      if (associated(prec%precv(i)%linmap%p_desc_U)) &
+           & prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      if (associated(prec%precv(i)%linmap%p_desc_V))&
+           & prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
     end do
   end if
 

amgprec/impl/amg_z_hierarchy_bld.F90

@@ -454,8 +454,13 @@ subroutine amg_z_hierarchy_bld(a,desc_a,prec,info)
     do i=2, iszv
       prec%precv(i)%base_a       => prec%precv(i)%ac
       prec%precv(i)%base_desc    => prec%precv(i)%desc_ac
-      prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      ! This is needed when the linmap object has been built
-      prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
+      ! reusing the base_desc descriptor through a pointer.
+      ! With PSBLAS 4 we will have a better solution
+      if (associated(prec%precv(i)%linmap%p_desc_U)) &
+           & prec%precv(i)%linmap%p_desc_U => prec%precv(i-1)%base_desc
+      if (associated(prec%precv(i)%linmap%p_desc_V))&
+           & prec%precv(i)%linmap%p_desc_V => prec%precv(i)%base_desc
     end do
   end if