Warn passing SSE argument ABI change for -m64

gcc/

	PR target/53425
	* config/i386/i386.c (type_natural_mode): Warn passing SSE
	vector argument without SSE enabled changes the ABI.

gcc/testsuite/

	PR target/53425
	* gcc.target/i386/pr53425-1.c: New file.
	* gcc.target/i386/pr53425-2.c: Likewise.

From-SVN: r187711

gcc/ChangeLog

+2012-05-21  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/53425
+	* config/i386/i386.c (type_natural_mode): Warn passing SSE
+	vector argument without SSE enabled changes the ABI.
+
 2012-05-21  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/53408

gcc/config/i386/i386.c

@@ -5827,6 +5827,20 @@ type_natural_mode (const_tree type, const CUMULATIVE_ARGS *cum)
 		      }
 		    return TYPE_MODE (type);
 		  }
+		else if ((size == 8 || size == 16) && !TARGET_SSE)
+		  {
+		    static bool warnedsse;
+
+		    if (cum
+			&& !warnedsse
+			&& cum->warn_sse)
+		      {
+			warnedsse = true;
+			warning (0, "SSE vector argument without SSE "
+				 "enabled changes the ABI");
+		      }
+		    return mode;
+		  }
 		else
 		  return mode;
 	      }

gcc/testsuite/ChangeLog

+2012-05-21  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/53425
+	* gcc.target/i386/pr53425-1.c: New file.
+	* gcc.target/i386/pr53425-2.c: Likewise.
+
 2012-05-21  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/53408

gcc/testsuite/gcc.target/i386/pr53425-1.c

+/* PR target/53425 */
+/* { dg-do compile { target { ! { ia32 } } } } */
+/* { dg-options "-O2 -mno-sse" } */
+
+typedef double __v2df __attribute__ ((__vector_size__ (16)));
+
+extern __v2df x;
+
+extern void bar (__v2df);
+void
+foo (void)
+{
+  bar (x); /* { dg-message "warning: SSE vector argument without SSE enabled changes the ABI" } */
+}

gcc/testsuite/gcc.target/i386/pr53425-2.c

+/* PR target/53425 */
+/* { dg-do compile { target { ! { ia32 } } } } */
+/* { dg-options "-O2 -mno-sse" } */
+
+typedef float __v2sf __attribute__ ((__vector_size__ (8)));
+
+extern __v2sf x;
+
+extern void bar (__v2sf);
+void
+foo (void)
+{
+  bar (x); /* { dg-message "warning: SSE vector argument without SSE enabled changes the ABI" } */
+}