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[Bug rtl-optimization/59890] var-tracking.c:val_reset segfaults


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59890

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
typedef unsigned long int mp_limb_t;
typedef mp_limb_t * mp_ptr;
typedef const mp_limb_t * mp_srcptr;
typedef long int mp_size_t;
mp_limb_t __quadmath_mpn_add_n (mp_ptr, mp_srcptr, mp_srcptr, mp_size_t);
mp_limb_t __quadmath_mpn_addmul_1 (mp_ptr, mp_srcptr, mp_size_t, mp_limb_t);
void __quadmath_mpn_impn_mul_n_basecase (mp_ptr prodp, mp_srcptr up,
                                         mp_srcptr vp, mp_size_t size)
{
  mp_size_t i;
  mp_limb_t cy_limb;
  mp_limb_t v_limb = vp[0];
  for (i = 1; i < size; i++)
    {
      if (v_limb <= 1)
        {
          cy_limb = 0;
          if (v_limb == 1)
            cy_limb = __quadmath_mpn_add_n (prodp, prodp, up, size);
        }
      else
        cy_limb = __quadmath_mpn_addmul_1 (prodp, up, size, v_limb);
      prodp[size] = cy_limb;
    }
}

fails to converge at -O2 -g -m32 with the patch applied.


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