[Bug target/69176] [6 Regression] ICE in in final_scan_insn, at final.c:2981 on aarch64-linux-gnu

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69176

--- Comment #19 from Matthias Klose <doko at gcc dot gnu.org> ---
here is a test case from an ICE I saw when backporting the patch to the gcc-5
Linaro branch. Fails with -O2, works with -O1

typedef int Nlm_Int4, ValNodePtr;
Nlm_Int4 b, e;
char c, d;
void fn1();
typedef struct { double patternProbability; } patternSearchItems;
char fn2();
void fn3();
patternSearchItems a;
void fn4() {
  Nlm_Int4 f[20000];
  char g[1];
  a = *(patternSearchItems *)fn3;
  while (fn2(c, d & e, b))
    if (a.patternProbability) {
      fn1(g);
      fn1(f);
    }
}