test_passing_unions.c: Avoid undefined array access.

	* gcc.target/x86_64/abi/avx/test_passing_unions.c: Avoid undefined
	array access.
	* gcc.target/x86_64/abi/avx/test_passing_structs.c: Likewise.

From-SVN: r186629

gcc/testsuite/ChangeLog

+2012-04-20  Uros Bizjak  <ubizjak@gmail.com>
+
+	* gcc.target/x86_64/abi/avx/test_passing_unions.c: Avoid undefined
+	array access.
+	* gcc.target/x86_64/abi/avx/test_passing_structs.c: Likewise.
+
 2012-04-20  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	PR rtl-optimization/44214

gcc/testsuite/gcc.target/x86_64/abi/avx/test_passing_structs.c

@@ -53,7 +53,7 @@ avx_test (void)
 
   clear_struct_registers;
   for (i = 0; i < 8; i++)
-    fregs.ymm0._m256[i] = m256s[i].x;
+    (&fregs.ymm0)[i]._m256[0] = m256s[i].x;
   num_fregs = 8;
   WRAP_CALL (check_struct_passing1)(m256s[0], m256s[1], m256s[2], m256s[3],
 				    m256s[4], m256s[5], m256s[6], m256s[7]);

gcc/testsuite/gcc.target/x86_64/abi/avx/test_passing_unions.c

@@ -113,7 +113,7 @@ avx_test (void)
 
   clear_struct_registers;
   for (i = 0; i < 8; i++)
-    fregs.ymm0._m256[i] = u1[i].x;
+    (&fregs.ymm0)[i]._m256[0] = u1[i].x;
   num_fregs = 8;
   check_union_passing1(u1[0], u1[1], u1[2], u1[3],
 		       u1[4], u1[5], u1[6], u1[7]);
@@ -122,7 +122,7 @@ avx_test (void)
   for (i = 0; i < 8; i++)
     {
       u2[i].x = u1[i].x;
-      fregs.ymm0._m256[i] = u2[i].x;
+      (&fregs.ymm0)[i]._m256[0] = u2[i].x;
     }
   num_fregs = 8;
   check_union_passing2(u2[0], u2[1], u2[2], u2[3],
@@ -132,7 +132,7 @@ avx_test (void)
   for (i = 0; i < 8; i++)
     {
       u3[i].x = u1[i].x;
-      fregs.ymm0._m256[i] = u3[i].x;
+      (&fregs.ymm0)[i]._m256[0] = u3[i].x;
     }
   num_fregs = 8;
   check_union_passing3(u3[0], u3[1], u3[2], u3[3],