i386.c (x86_this_parameter): Handle aggregate for __thiscall convention.

2010-04-12  Kai Tietz  <kai.tietz@onevision.com>

        PR/43702
        * config/i386/i386.c (x86_this_parameter): Handle aggregate for
        __thiscall convention.

From-SVN: r158232

gcc/ChangeLog

+2010-04-12  Kai Tietz  <kai.tietz@onevision.com>
+
+	PR/43702
+	* config/i386/i386.c (x86_this_parameter): Handle aggregate for
+	__thiscall convention.
+
 2010-04-12  Steve Ellcey  <sje@cup.hp.com>
 
 	* config/pa/pa.c (hppa_legitimize_address): Remove unused variable

gcc/config/i386/i386.c

@@ -26232,11 +26232,13 @@ x86_this_parameter (tree function)
 
       if (lookup_attribute ("fastcall", TYPE_ATTRIBUTES (type)))
 	regno = aggr ? DX_REG : CX_REG;
-      /* ???: To be verified. It is not absolutely clear how aggregates
-         have to be treated for thiscall.  We assume that they are
-	 identical to fastcall.  */
       else if (lookup_attribute ("thiscall", TYPE_ATTRIBUTES (type)))
-	regno = aggr ? DX_REG : CX_REG;
+        {
+	  regno = CX_REG;
+	  if (aggr)
+	    return gen_rtx_MEM (SImode,
+				plus_constant (stack_pointer_rtx, 4));
+	}
       else
         {
 	  regno = AX_REG;