gcc_is_broken.c

#include <stdio.h>
#define go(n) __asm__("jmp *%%rax\n"::"a"(n))

void sw(int n) {
  volatile void *dests[4] = {&&l0,&&l1,&&l2,&&l3};
  go(dests[n]);
l0:
  printf("zero\n");
  goto end;
l1:
  printf("one\n");
  goto end;
l2:
  printf("two\n");
  goto end;
l3:
  printf("three\n");
  goto end;
end:
  return;
}
int main() {
  int i;
  for(i=0;i<4;i++) {
    sw(i);
  }
  return 0;
}