gcc/testsuite/gcc.dg/pr46620.c

   1 /* PR tree-optimization/46620 */
   2 /* SRA bitfield grouping used to lose track at padding bitfields in
   3    the middle of a word.  */
   4 /* { dg-do run } */
   5 /* { dg-options "-O2" } */
   6
   7 #include <stdlib.h>
   8
   9 struct PCT
  10 {
  11   unsigned char pi1     : 4;
  12   unsigned char pi2     : 3;
  13   unsigned char pif     : 5;
  14
  15   unsigned char sl      : 2;
  16   unsigned char uc      : 1;
  17   unsigned char st      : 1;
  18
  19   unsigned char p       : 1;
  20   unsigned char cs      : 1;
  21   unsigned char ss      : 1;
  22
  23   unsigned char pc      : 3;
  24   unsigned char dmv     : 4;
  25   unsigned char cv      : 4;
  26 };
  27
  28 struct rt
  29 {
  30   struct rt*            d;
  31   void (*edo)(void * const);
  32   short                 lId;
  33   char          dac;
  34 };
  35
  36 struct pedr
  37 {
  38   struct rt re;
  39   struct PCT pc;
  40   unsigned char mid;
  41 } ;
  42
  43 void __attribute__((__noinline__))
  44 rei(struct rt* const me, unsigned short anId, void *ad )
  45 {
  46   asm volatile ("");
  47 }
  48
  49 void __attribute__((__noinline__))
  50 pedrdo(void * const p)
  51 {
  52   asm volatile ("");
  53 }
  54
  55 void __attribute__((__noinline__))
  56 pedri (struct pedr* const  me, struct PCT ppc, unsigned char pmid)
  57 {
  58   rei(&(me->re), 0x7604, 0);
  59   me->pc = ppc;
  60   me->mid = pmid;
  61   (me)->re.edo = pedrdo;
  62 }
  63
  64 int main()
  65 {
  66   struct PCT ps;
  67   struct pedr pm;
  68
  69   pm.pc.dmv = 0;
  70   ps.dmv = 1;
  71   pedri(&pm, ps, 32);
  72
  73   if (pm.pc.dmv != 1)
  74     abort ();
  75   exit (0);
  76 }