File: pr67736.c

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gcc-arm-none-eabi 15%3A8-2019-q3-1
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/* { dg-do run { target { stdint_types } } } */

#include <stdint.h>
#include <stdlib.h>

void f(uint64_t *a, uint64_t aa) __attribute__((noinline));
void f(uint64_t *a, uint64_t aa)
{
  uint64_t new_value = aa;
  uint64_t old_value = *a;
  int bit_size = 32;
    uint64_t mask = (uint64_t)(unsigned)(-1);
    uint64_t tmp = old_value & mask;
    new_value &= mask;
    /* On overflow we need to add 1 in the upper bits */
    if (tmp > new_value)
        new_value += 1ull<<bit_size;
    /* Add in the upper bits from the old value */
    new_value += old_value & ~mask;
    *a = new_value;
}
int main(void)
{
  uint64_t value, new_value, old_value;
  value = 0x100000001;
  old_value = value;
  new_value = (value+1)&(uint64_t)(unsigned)(-1);
  f(&value, new_value);
  if (value != old_value+1)
    __builtin_abort ();
  return 0;
}