re PR target/34001 (Incorrect x86 fastcall behavior)

2007-11-27  H.J. Lu  <hongjiu.lu@intel.com>
	    Joey Ye <joey.ye@intel.com>

	PR target/34001
	* config/i386/i386.c (function_arg_32): Don't pass aggregate
	arguments in ECX/EDX for fastcall.

Co-Authored-By: Joey Ye <joey.ye@intel.com>

From-SVN: r130488

gcc/ChangeLog

+2007-11-27  H.J. Lu  <hongjiu.lu@intel.com>
+	    Joey Ye <joey.ye@intel.com>
+
+	PR target/34001
+	* config/i386/i386.c (function_arg_32): Don't pass aggregate
+	arguments in ECX/EDX for fastcall.
+
 2007-11-28  Rask Ingemann Lambertsen  <rask@sygehus.dk>
 
 	* config/i386/linux.h (CRT_GET_RFIB_DATA): Add Intel syntax inline

gcc/config/i386/i386.c

@@ -4253,10 +4253,13 @@ function_arg_32 (CUMULATIVE_ARGS *cum, enum machine_mode mode,
 	  int regno = cum->regno;
 
 	  /* Fastcall allocates the first two DWORD (SImode) or
-	     smaller arguments to ECX and EDX.  */
+            smaller arguments to ECX and EDX if it isn't an
+            aggregate type .  */
 	  if (cum->fastcall)
 	    {
-	      if (mode == BLKmode || mode == DImode)
+	      if (mode == BLKmode
+		  || mode == DImode
+		  || (type && AGGREGATE_TYPE_P (type)))
 	        break;
 
 	      /* ECX not EAX is the first allocated register.  */