/* PR rtl-optimization/20532 *//* { dg-do run } *//* { dg-options "" } *//* { dg-options "-march=i386" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } *//* We used to optimize the DImode shift-by-32 to zero because in combine   we turned:     (v << 31) + (v << 31)   into:     (v * (((HOST_WIDE_INT)1 << 31) + ((HOST_WIDE_INT)1 << 31)))   With a 32-bit HOST_WIDE_INT, the coefficient overflowed to zero.  */unsigned long long int badshift(unsigned long long int v){        return v << 31 << 1;}extern void abort ();int main() {  if (badshift (1) == 0)    abort ();  return 0;}