gcc/testsuite/gcc.dg/union-4.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-rtl-cse1" } */
   3
   4 extern void abort(void);
   5
   6 typedef unsigned int uint32;
   7 typedef unsigned long long uint64;
   8
   9 typedef union {
  10   uint32 i32;
  11   uint64 i64;
  12 } u64;
  13
  14 void foo(void)
  15 {
  16   u64 data;
  17   data.i64 = 1;
  18   if (data.i32 != 1)
  19     abort ();
  20 }
  21
  22 /* { dg-final { scan-rtl-dump-not "abort" "cse1" { target i?86-*-* x86_64-*-* } } } */