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[COMMITTED] ada: Lift restriction on optimization of aliased objects

Message ID 20230116144841.3171334-1-poulhies@adacore.com
State Unresolved
Headers
Series [COMMITTED] ada: Lift restriction on optimization of aliased objects |

Checks

Context Check Description
snail/gcc-patch-check warning Git am fail log

Commit Message

Marc Poulhiès Jan. 16, 2023, 2:48 p.m. UTC 
  From: Eric Botcazou <ebotcazou@adacore.com>

It turns out that the only blocking case is an aliased object whose nominal
subtype is an unconstrained array because the bounds must be allocated.

gcc/ada/

	* exp_ch3.adb (Expand_N_Object_Declaration): Also optimize aliased
	objects if their nominal subtype is not an unconstrained array.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/exp_ch3.adb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

diff --git a/gcc/ada/exp_ch3.adb b/gcc/ada/exp_ch3.adb
index 536ae0c36e4..c866a9c40f5 100644
--- a/gcc/ada/exp_ch3.adb
+++ b/gcc/ada/exp_ch3.adb
@@ -7965,10 +7965,10 @@  package body Exp_Ch3 is
 
               Is_Entity_Name (Original_Node (Obj_Def))
 
-                --  The aliased case has to be excluded because the expression
-                --  will not be aliased in the general case.
+                --  Nor if it is effectively an unconstrained declaration
 
-                and then not Aliased_Present (N)
+                and then not (Is_Array_Type (Typ)
+                               and then Is_Constr_Subt_For_UN_Aliased (Typ))
 
                 --  We may use a renaming if the initializing expression is a
                 --  captured function call that meets a few conditions.