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* [Bug ada/37602] New: Renaming of volatile causes variable access
@ 2008-09-20 19:57 sam at gcc dot gnu dot org
2009-10-02 21:36 ` [Bug ada/37602] " sam at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: sam at gcc dot gnu dot org @ 2008-09-20 19:57 UTC (permalink / raw)
To: gcc-bugs
The following procedure generates an access to A because of its renaming as B,
even though no explicit access is made to A or B. I think this violates the
second sentence of C.6(20).
with Interfaces; use Interfaces;
with System.Storage_Elements; use System.Storage_Elements;
procedure T is
A : Unsigned_8;
for A'Address use To_Address (1000);
pragma Volatile (A);
B : Unsigned_8 renames A;
begin
null;
end T;
The generated assembler code (-O3 -fomit-frame-pointer) for this procedure is:
_ada_t:
subl $12, %esp
movzbl 1000, %eax
addl $12, %esp
ret
--
Summary: Renaming of volatile causes variable access
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: ada
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sam at gcc dot gnu dot org
GCC host triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37602
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug ada/37602] Renaming of volatile causes variable access
2008-09-20 19:57 [Bug ada/37602] New: Renaming of volatile causes variable access sam at gcc dot gnu dot org
@ 2009-10-02 21:36 ` sam at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: sam at gcc dot gnu dot org @ 2009-10-02 21:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from sam at gcc dot gnu dot org 2009-10-02 21:36 -------
Still present in GCC trunk (4.5.0 20090930)
--
sam at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-10-02 21:36:12
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37602
^ permalink raw reply [flat|nested] 2+ messages in thread
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2008-09-20 19:57 [Bug ada/37602] New: Renaming of volatile causes variable access sam at gcc dot gnu dot org
2009-10-02 21:36 ` [Bug ada/37602] " sam at gcc dot gnu dot org
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