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/* PROLOG END TAG zYx                                              */
#ifdef __SPU__

#ifndef _LDEXPD2_H_
#define _LDEXPD2_H_ 1

#include <spu_intrinsics.h>

/*
 * FUNCTION
 *      vector double _ldexpd2(vector double x, vector signed long long exp)
 *
 * DESCRIPTION
 *      The _ldexpd2 function Computes x * 2^exp for each of the two elements
 *      of x using the corresponding elements of exp.
 *
 */
static __inline vector double
_ldexpd2(vector double x, vector signed long long llexp)
{
    vec_uchar16 odd_to_even = ((vec_uchar16) { 4, 5, 6, 7, 0x80, 0x80, 0x80, 0x80, 12, 13, 14, 15,
                                               0x80, 0x80, 0x80, 0x80 });
    vec_int4    exp;
    vec_int4    e1, e2;
    vec_int4    min = spu_splats(-2044);
    vec_int4    max = spu_splats(2046);
    vec_uint4   cmp_min, cmp_max;
    vec_uint4   shift = (vec_uint4) { 20, 32, 20, 32 };
    vec_double2 f1, f2;
    vec_double2 out;

    exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even);

    /* Clamp the specified exponent to the range -2044 to 2046.
     */

    cmp_min = spu_cmpgt(exp, min);
    cmp_max = spu_cmpgt(exp, max);
    exp = spu_sel(min, exp, cmp_min);
    exp = spu_sel(exp, max, cmp_max);

    /* Generate the factors f1 = 2^e1 and f2 = 2^e2
     */
    e1 = spu_rlmaska(exp, -1);
    e2 = spu_sub(exp, e1);

    f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift);
    f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift);

    /* Compute the product x * 2^e1 * 2^e2
     */
    out = spu_mul(spu_mul(x, f1), f2);

    return (out);
}

#endif /* _LDEXPD2_H_ */
#endif /* __SPU__ */
