1  /* Check that no unnecessary T bit stores are done before conditional
       2     branches.
       3     This case was extracted from the CSiBE set and contained the following
       4     sequence:
       5  	mov.l	@(8,r4),r2
       6  	mov.l	@(4,r4),r3
       7  	cmp/gt	r2,r3
       8  	movt	r2
       9  .L3:
      10  	tst	r2,r2
      11  	bt/s	.L12
      12  	mov	#-1,r0
      13  
      14  	.....
      15  
      16  	mov.l	@r4,r2
      17  	tst	r2,r2
      18  	bra	.L3
      19  	movt	r2
      20  
      21     In this reduced code the movt insns were only present in the
      22     unwanted sequences.  Thus, if we see any movt insns, something is not
      23     working as expected.  This test requires -O2 because the T bit stores
      24     in question will be eliminated in additional insn split passes after
      25     reload.  */
      26  /* { dg-do compile }  */
      27  /* { dg-options "-O2" } */
      28  /* { dg-final { scan-assembler-not "movt" } } */
      29  
      30  struct request
      31  {
      32   unsigned long nr_sectors;
      33  };
      34  
      35  struct request_list
      36  {
      37   int count;
      38  };
      39  
      40  struct request_queue
      41  {
      42   struct request_list rq;
      43   volatile int nr_sectors;
      44   int max_queue_sectors;
      45   int can_throttle;
      46   unsigned long bounce_pfn;
      47  };
      48  
      49  typedef struct request_queue request_queue_t;
      50  
      51  static inline int
      52  blk_oversized_queue (request_queue_t* q)
      53  {
      54    if (q->can_throttle)
      55      return q->nr_sectors > q->max_queue_sectors;
      56    return q->rq.count == 0;
      57  }
      58  
      59  struct request*
      60  get_request (request_queue_t* q, int rw)
      61  {
      62    struct request* rq = ((void*)0);
      63    struct request_list *rl = &q->rq;
      64  
      65    if (blk_oversized_queue (q))
      66      {
      67        if ((rw == 1) || (rw == 0))
      68  	return ((void*)0);
      69        if (blk_oversized_queue (q))
      70  	return ((void*)0);
      71      }
      72  
      73    return (void*)-100;
      74  }