gcc/testsuite/gcc.dg/tree-ssa/20030731-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-dom2 -std=gnu89" } */
   3
   4 extern void abort (void);
   5
   6 struct rtx_def;
   7 typedef struct rtx_def *rtx;
   8 struct rtvec_def;
   9 typedef struct rtvec_def *rtvec;
  10 union tree_node;
  11 typedef union tree_node *tree;
  12 struct rtx_def
  13 {
  14   int code;
  15   int mode;
  16   unsigned int in_struct:1;
  17 };
  18 struct tree_common
  19 {
  20   int code;
  21 };
  22 struct tree_decl
  23 {
  24   rtx rtl;
  25 };
  26 union tree_node
  27 {
  28   struct tree_common common;
  29   struct tree_decl decl;
  30 };
  31 rtx
  32 store_expr (exp, target, want_value)
  33      tree exp;
  34      rtx target;
  35      int want_value;
  36 {
  37   if (exp->common.code == 42)
  38     abort ();
  39   else if (queued_subexp_p (target))
  40     {
  41       blah (target->mode);
  42       if (target->code)
  43         abort ();
  44     }
  45   else
  46     {
  47       if (target->code && (__extension__({target;})->in_struct));
  48     }
  49
  50   if ((target != (exp->decl.rtl
  51                   ? (exp->decl.rtl
  52                      ? exp->decl.rtl
  53                      : (make_decl_rtl (exp, 0), exp->decl.rtl))
  54                   : 0))
  55       && expr_size (exp))
  56     ;
  57 }
  58
  59 /* All paths to the test "target != 0" occurring in the final IF statement
  60    dereference target.  Thus target can not have the value zero at that
  61    point and the test should have been eliminated.  */
  62 /* ??? The dominator walker (A) doesn't merge this data at joins and
  63    (B) only looks at immediate dominators, and only queued_subexp_p
  64    immediately dominates the comparison in question.  We need something
  65    stronger.  */
  66 /* { dg-final { scan-tree-dump-times "target.*!= 0" 0 "dom2" { xfail *-*-* } } } */