fails with r191092, worked with r190380 on the 4.7 branch, taken from a cython testcase, with -O[0-3]:

$ gcc -c -g -O0 -I/usr/include/python2.7 pyx.c
pyx.c: In function '__pyx_t_long_double_complex_from_parts':
pyx.c:14:16: internal compiler error: in gimplify_expr, at gimplify.c:7592
Please submit a full bug report,
with preprocessed source if appropriate.

typedef struct {
    double real;
    double imag;
} Py_complex;

typedef struct _object {
    unsigned int refcnt;
} PyObject;

typedef long double _Complex __pyx_t_long_double_complex;

static __inline__ __pyx_t_long_double_complex
__pyx_t_long_double_complex_from_parts(long double x, long double y)
{
    return x + y*(__pyx_t_long_double_complex)(__extension__ 1.0iF);
}

static __pyx_t_long_double_complex
__Pyx_PyComplex_As___pyx_t_long_double_complex(PyObject* o) {
    Py_complex cval;
    return __pyx_t_long_double_complex_from_parts(
               (long double)cval.real,
               (long double)cval.imag);
}