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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42
43 #ifndef _LDEXPD2_H_
44 #define _LDEXPD2_H_ 1
45
46 #include <spu_intrinsics.h>
47
48 /*
49 * FUNCTION
50 * vector double _ldexpd2(vector double x, vector signed long long exp)
51 *
52 * DESCRIPTION
53 * The _ldexpd2 function Computes x * 2^exp for each of the two elements
54 * of x using the corresponding elements of exp.
55 *
56 */
_ldexpd2(vector double x,vector signed long long llexp)57 static __inline vector double _ldexpd2(vector double x, vector signed long long llexp)
58 {
59 vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80,
60 12,13,14,15, 0x80,0x80,0x80,0x80 });
61 vec_int4 exp;
62 vec_int4 e1, e2;
63 vec_int4 min = spu_splats(-2044);
64 vec_int4 max = spu_splats(2046);
65 vec_uint4 cmp_min, cmp_max;
66 vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 };
67 vec_double2 f1, f2;
68 vec_double2 out;
69
70 exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even);
71
72 /* Clamp the specified exponent to the range -2044 to 2046.
73 */
74
75 cmp_min = spu_cmpgt(exp, min);
76 cmp_max = spu_cmpgt(exp, max);
77 exp = spu_sel(min, exp, cmp_min);
78 exp = spu_sel(exp, max, cmp_max);
79
80 /* Generate the factors f1 = 2^e1 and f2 = 2^e2
81 */
82 e1 = spu_rlmaska(exp, -1);
83 e2 = spu_sub(exp, e1);
84
85 f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift);
86 f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift);
87
88 /* Compute the product x * 2^e1 * 2^e2
89 */
90 out = spu_mul(spu_mul(x, f1), f2);
91
92 return (out);
93 }
94
95 #endif /* _LDEXPD2_H_ */
96 #endif /* __SPU__ */
97
98