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From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/19410] Overlapping memcpy with big struct copies Date: Mon, 12 Sep 2005 07:12:00 -0000 [thread overview] Message-ID: <20050912071222.2791.qmail@sourceware.org> (raw) In-Reply-To: <20050112225244.19410.baldrick@free.fr> ------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-09-12 07:12 ------- Here are 2 equivalent testcases in Ada and C: procedure p is SUBTYPE INT IS INTEGER RANGE 0..1000; TYPE RECTYPE (CONSTRAINT : INT := 80) IS RECORD INTFIELD : INTEGER; STRFIELD : STRING (1..CONSTRAINT); END RECORD; REC1 : RECTYPE(1000); PROCEDURE COPY_RECTYPE (REC : OUT RECTYPE) is begin REC := REC1; end; begin COPY_RECTYPE (REC1); end; struct A { int a[1024]; }; struct A my_a; void g(struct A *a) { *a = my_a; } int main(void) { g(&my_a); } The call to "memcpy" is hard-wired in the middle-end (expr.c:1390): void init_block_move_fn (const char *asmspec) { if (!block_move_fn) { tree args, fn; fn = get_identifier ("memcpy"); args = build_function_type_list (ptr_type_node, ptr_type_node, const_ptr_type_node, sizetype, NULL_TREE); fn = build_decl (FUNCTION_DECL, fn, args); DECL_EXTERNAL (fn) = 1; TREE_PUBLIC (fn) = 1; DECL_ARTIFICIAL (fn) = 1; TREE_NOTHROW (fn) = 1; block_move_fn = fn; } I still don't plan to work on this in the near future. -- What |Removed |Added ---------------------------------------------------------------------------- CC| |ebotcazou at gcc dot gnu dot | |org AssignedTo|ebotcazou at gcc dot gnu dot|unassigned at gcc dot gnu |org |dot org Status|ASSIGNED |NEW http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19410
next prev parent reply other threads:[~2005-09-12 7:12 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2005-01-12 22:52 [Bug ada/19410] New: ACATS c64106a - valgrind detects wrong code (overlapping memcpy) baldrick at free dot fr 2005-01-12 23:12 ` [Bug ada/19410] " baldrick at free dot fr 2005-01-12 23:36 ` [Bug middle-end/19410] Overlapping memcpy with big struct copies (ACATS c64106a) pinskia at gcc dot gnu dot org 2005-01-12 23:52 ` baldrick at free dot fr 2005-01-12 23:57 ` pinskia at gcc dot gnu dot org 2005-01-13 0:08 ` baldrick at free dot fr 2005-01-13 0:13 ` pinskia at gcc dot gnu dot org 2005-01-13 10:49 ` baldrick at free dot fr 2005-02-24 19:00 ` bosch at gcc dot gnu dot org 2005-02-24 21:23 ` ebotcazou at gcc dot gnu dot org 2005-09-12 7:12 ` ebotcazou at gcc dot gnu dot org [this message] [not found] <bug-19410-8622@http.gcc.gnu.org/bugzilla/> 2006-12-01 8:31 ` [Bug middle-end/19410] Overlapping memcpy with big struct copies baldrick at gcc dot gnu dot org
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