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* [gcc r12-2026] [Ada] Fix excessive check for alignment of overlaying objects
@ 2021-07-05 13:14 Pierre-Marie de Rodat
0 siblings, 0 replies; only message in thread
From: Pierre-Marie de Rodat @ 2021-07-05 13:14 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1d1e91f4c3f74bfa4d106d184ca206b5abccec4f
commit r12-2026-g1d1e91f4c3f74bfa4d106d184ca206b5abccec4f
Author: Piotr Trojanek <trojanek@adacore.com>
Date: Thu Apr 29 11:39:24 2021 +0200
[Ada] Fix excessive check for alignment of overlaying objects
gcc/ada/
* sem_util.adb (Has_Compatible_Alignment_Internal): If the
prefix of the Address expression is an entire object with a
known alignment, then skip checks related to its size.
Diff:
---
gcc/ada/sem_util.adb | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index e0a12bddca1..25060cc9502 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -11939,6 +11939,7 @@ package body Sem_Util is
elsif Is_Entity_Name (Expr)
and then Known_Alignment (Entity (Expr))
then
+ Offs := Uint_0;
ExpA := Alignment (Entity (Expr));
-- Otherwise, we can use the alignment of the type of Expr
@@ -11961,9 +11962,9 @@ package body Sem_Util is
Set_Result (Known_Incompatible);
end if;
- -- If Expr is not a piece of a larger object, see if size
- -- is given. If so, check that it is not too small for the
- -- required alignment.
+ -- If Expr is a component or an entire object with a known
+ -- alignment, then we are fine. Otherwise, if its size is
+ -- known, it must be big enough for the required alignment.
if Offs /= No_Uint then
null;
@@ -11982,7 +11983,7 @@ package body Sem_Util is
end if;
-- If we got a size, see if it is a multiple of the Obj
- -- alignment, if not, then the alignment cannot be
+ -- alignment; if not, then the alignment cannot be
-- acceptable, since the size is always a multiple of the
-- alignment.
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