gcc/testsuite/gcc.dg/pr100834.c

   1 /* PR tree-optimization/100834 */
   2 /* { dg-do compile { target size32plus } } */
   3 /* { dg-options "-O2 -Wall" } */
   4
   5 #define PAGE_SIZE       4096
   6 #define STACK_SIZE      PAGE_SIZE
   7
   8 union registers
   9 {
  10   struct
  11   {
  12     unsigned long r15, r14, r13, r12, r11, r10, r9, r8;
  13     unsigned long rdi, rsi, rbp, unused, rbx, rdx, rcx, rax;
  14   };
  15   unsigned long by_index[16];
  16 };
  17
  18 struct per_cpu
  19 {
  20   union
  21   {
  22     unsigned char stack[STACK_SIZE];
  23     struct
  24     {
  25       unsigned char __fill[STACK_SIZE - sizeof (union registers)];
  26       union registers guest_regs;
  27     };
  28   };
  29 } __attribute__((aligned (PAGE_SIZE)));
  30
  31 static inline struct per_cpu *
  32 this_cpu_data (void)
  33 {
  34   return (struct per_cpu *) 0xdeadbeef;
  35 }
  36
  37 void
  38 foo (void)
  39 {
  40   struct per_cpu *cpu_data = this_cpu_data ();
  41   __builtin_memset (&cpu_data->guest_regs, 0, sizeof (cpu_data->guest_regs));   /* { dg-bogus "is out of the bounds" } */
  42 }