re PR middle-end/20491 (internal compiler error: in subreg_regno_offset, at rtlanal.c:3042)

PR middle-end/20491
* gcc.dg/torture/asm-subreg-1.c: New test.

From-SVN: r97204

gcc/testsuite/ChangeLog

+2005-03-29  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR middle-end/20491
+	* gcc.dg/torture/asm-subreg-1.c: New test.
+
 2005-03-29  Joseph S. Myers  <joseph@codesourcery.com>
 
 	PR c/20672

gcc/testsuite/gcc.dg/torture/asm-subreg-1.c

+/* PR middle-end/20491 */
+
+/* { dg-do compile } */
+
+/* Combine used to introduce invalid subregs for the asm input, and
+   we'd crash later on, when removing all subregs.  */
+
+volatile unsigned short _const_32 [4] = {1,2,3,4};
+void
+evas_common_convert_yuv_420p_601_rgba()
+{
+  __asm__ __volatile__ ("" : : "X" (*_const_32));
+}
+