[Bug target/22017] [3.4/4.0/4.1 Regression] Error to pass struct parameter when compile with mingw's gcc.exe using "-march=i386 -mrtd" flags

["lyuzhou at 21cn dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From lyuzhou at 21cn dot com  2005-06-13 05:41 -------
I just apply your patch to mingw gcc 3.4.4.
But it seems failed too.

(In reply to comment #3)
> Hi,
> This is what is says in the comments above i386/i386.c:
> ix86_return_pop_args:
>    FUNDECL is the declaration node of the function (as a tree),
>    FUNTYPE is the data type of the function (as a tree),
>    or for a library call it is an identifier node for the subroutine name.
> and indeed , the call to build_decl in init_block_move_fn in expr.c
> (where the call to "mmecpy" is generated) has an identifier node as the
> second arg.
> There appears to be a long-standing thinko in the test for library calls
> in ix86_return_pops_args.
> This patch fixes the memcpy call in the testcase on trunk. I'll do a
> bootstrap and regetest overnight. Could you test on 3.4 branch please.
> 	* config/i386/i386 (ix86_return_pops_args): Test the function
> 	type, not the decl node, when testing for library call.
> Index: i386.c
> ===================================================================
> RCS file: /cvs/gcc/gcc/gcc/config/i386/i386.c,v
> retrieving revision 1.829
> diff -c -3 -p -r1.829 i386.c
> *************** ix86_eax_live_at_start_p (void)
> *** 1943,1949 ****
>   int
>   ix86_return_pops_args (tree fundecl, tree funtype, int size)
>   {
> !   int rtd = TARGET_RTD && (!fundecl || TREE_CODE (fundecl) != 
> IDENTIFIER_NODE);
>   
>     /* Cdecl functions override -mrtd, and never pop the stack.  */
>     if (! lookup_attribute ("cdecl", TYPE_ATTRIBUTES (funtype))) {
> --- 1943,1949 ----
>   int
>   ix86_return_pops_args (tree fundecl, tree funtype, int size)
>   {
> !   int rtd = TARGET_RTD  && (!funtype || TREE_CODE (funtype) != 
> IDENTIFIER_NODE);
>   
>     /* Cdecl functions override -mrtd, and never pop the stack.  */
>     if (! lookup_attribute ("cdecl", TYPE_ATTRIBUTES (funtype))) {



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22017