ICE in trunc_int_for_mode, at explow.c:55

[Matthias Klose]

seen on aarch64-linux-gnu with gcc-4.8.x everywhere, fixed in 4.9 (worked around with -O1)

$ cat trunctfdf2.i
long a;
double b;
double fn1() {
  union {
    long double f;
    __uint128_t i;
  } c = {b};
  __uint128_t d = c.i & 2;
  a = 1;
  long e = 1 | d;
  return e;
}

$ gcc -std=gnu99 -c -g -O2 trunctfdf2.i
trunctfdf2.i: In function 'fn1':
trunctfdf2.i:12:1: internal compiler error: in trunc_int_for_mode, at explow.c:55
 }
 ^
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with preprocessed source if appropriate.