overflow-1.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 26 行

/* PR optimization/13318 */
/* Origin: <[e-mail]> */
/* Reduced testcase: Wolfgang Bangerth <[e-mail]> */

/* Verify that the big multiplier doesn't cause an integer
   overflow in the loop optimizer.  */

/* { dg-do compile } */
/* { dg-options "-O2" } */

struct S {
  int key;
  int rnext,rprev;
};
 
void foo(struct S* H)
{
  int i, k;
  for (i=0; i<2; i++){
    struct S* cell=H+k;
    cell->key=i*(0xffffffffUL/2);
    cell->rnext=k+(1-i);
    cell->rprev=k+(1-i);
  }
}