gcc/testsuite/c-c++-common/auto-init-7.c

   1 /* Verify zero initialization for array, union, and structure type automatic variables.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-ftrivial-auto-var-init=zero -fdump-tree-gimple" } */
   4
   5 struct S
   6 {
   7   int f1;
   8   float f2;
   9   char f3[20];
  10 };
  11
  12 union U
  13 {
  14   char u1[5];
  15   int u2;
  16   float u3;
  17 };
  18
  19 double result;
  20
  21 double foo()
  22 {
  23   int temp1[3];
  24   double temp2[3];
  25   struct S temp3;
  26   union U temp4;
  27
  28   result = temp1[2] + temp2[1] + temp3.f2 + temp4.u3;
  29   return result;
  30 }
  31
  32 /* { dg-final { scan-tree-dump "temp1 = .DEFERRED_INIT \\(12, 2, \&\"temp1\"" "gimple" } } */
  33 /* { dg-final { scan-tree-dump "temp2 = .DEFERRED_INIT \\(24, 2, \&\"temp2\"" "gimple" } } */
  34 /* { dg-final { scan-tree-dump "temp3 = .DEFERRED_INIT \\(28, 2, \&\"temp3\"" "gimple" } } */
  35 /* { dg-final { scan-tree-dump "temp4 = .DEFERRED_INIT \\((8|5), 2, \&\"temp4\"" "gimple" } } */