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37 /* PROLOG END TAG zYx */
38 #ifdef __SPU__
39 #ifndef _SIGNBITD2_H_
40 #define _SIGNBITD2_H_ 1
41
42 #include <spu_intrinsics.h>
43
44 /*
45 * FUNCTION
46 * vector unsigned long long _signbitd2(vector double x)
47 *
48 * DESCRIPTION
49 * The signbitd2 function returns a vector which contains either all ones
50 * or all zeros, depending on the sign of the corresponding input vector
51 * element.
52 *
53 * Note that the signbit functions are not logically equivalent to
54 * x < 0.0. IEEE 754 floating point rules include a signed zero, so if
55 * the input value is –0.0, signbit will return non-zero, but the naive
56 * implementation will not.
57 *
58 * RETURNS
59 * The function signbitf4 returns an unsigned int vector in which each
60 * element is defined as:
61 *
62 * - ULLONG_MAX (0xFFFFFFFFFFFFFFFF) if the sign bit is set for the
63 * corresponding element of x
64 * - 0 (0x0000000000000000) otherwise.
65 *
66 */
_signbitd2(vector double x)67 static __inline vector unsigned long long _signbitd2(vector double x)
68 {
69 vec_uchar16 shuf = ((vec_uchar16){0, 1, 2, 3, 0, 1, 2, 3, 8, 9, 10, 11, 8, 9, 10, 11});
70 vec_uint4 r = spu_rlmaska((vec_uint4)x,-31);
71 return (vec_ullong2)spu_shuffle(r,r,shuf);
72 }
73 #endif /* _SIGNBITD2_H_ */
74 #endif /* __SPU__ */
75
