To be tested...

casts.c

int my_int;

float my_float;

char my_char;

long long my_longlong;

struct { char a; long long b; } my_aligned;

#pragma pack(1)
struct { char a; long long b; } my_unaligned;

void who_is_right(void)
{
  asm("nop ; explicit cast from float to int");
  my_int = (int) my_float;
  asm("nop ; explicit cast from int to float");
  my_float = (float) my_int;
  asm("nop ; implicit cast from float to int");
  my_int = my_float;
  asm("nop ; implicit cast from int to float");
  my_float = my_int;

  asm("nop ; access to aligned struct");
  my_char = my_aligned.a;
  my_longlong = my_aligned.b;

  asm("nop ; access to unaligned struct");
  my_char = my_unaligned.a;
  my_longlong = my_unaligned.b;
}