re PR tree-optimization/46620 (32-bit structures containing bitfields are not…

re PR tree-optimization/46620 (32-bit structures containing bitfields are not copied correctly on -O2 , x86 backend)

PR tree-optimization/46620
* gcc.dg/pr46620.c: New.

From-SVN: r170325

gcc/testsuite/ChangeLog

+2011-02-19  Alexandre Oliva  <aoliva@redhat.com>
+
+	PR tree-optimization/46620
+	* gcc.dg/pr46620.c: New.
+
 2011-02-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/47809

gcc/testsuite/gcc.dg/pr46620.c

+/* PR tree-optimization/46620 */
+/* SRA bitfield grouping used to lose track at padding bitfields in
+   the middle of a word.  */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+#include <stdlib.h>
+
+struct PCT
+{
+  unsigned char	pi1	: 4;
+  unsigned char	pi2	: 3;
+  unsigned char	pif	: 5;
+
+  unsigned char	sl	: 2;
+  unsigned char	uc	: 1;
+  unsigned char	st	: 1;
+
+  unsigned char	p	: 1;
+  unsigned char	cs	: 1;
+  unsigned char	ss	: 1;
+
+  unsigned char	pc	: 3;
+  unsigned char	dmv	: 4;
+  unsigned char	cv	: 4;
+};
+
+struct rt
+{
+  struct rt*		d;
+  void (*edo)(void * const);
+  short			lId;
+  char          dac;
+};
+
+struct pedr
+{
+  struct rt re;
+  struct PCT pc;
+  unsigned char mid;
+} ;
+
+void __attribute__((__noinline__))
+rei(struct rt* const me, unsigned short anId, void *ad )
+{
+  asm volatile ("");
+}
+
+void __attribute__((__noinline__))
+pedrdo(void * const p)
+{
+  asm volatile ("");
+}
+
+void __attribute__((__noinline__))
+pedri (struct pedr* const  me, struct PCT ppc, unsigned char pmid)
+{
+  rei(&(me->re), 0x7604, 0);
+  me->pc = ppc;
+  me->mid = pmid;
+  (me)->re.edo = pedrdo;
+}
+
+int main()
+{
+  struct PCT ps;
+  struct pedr pm;
+
+  pm.pc.dmv = 0;
+  ps.dmv = 1;
+  pedri(&pm, ps, 32);
+
+  if (pm.pc.dmv != 1)
+    abort ();
+  exit (0);
+}