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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _SIGNBITD2_H_
#define _SIGNBITD2_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector unsigned long long _signbitd2(vector double x)
*
* DESCRIPTION
* The signbitd2 function returns a vector which contains either all ones
* or all zeros, depending on the sign of the corresponding input vector
* element.
* Note that the signbit functions are not logically equivalent to
* x < 0.0. IEEE 754 floating point rules include a signed zero, so if
* the input value is –0.0, signbit will return non-zero, but the naive
* implementation will not.
* RETURNS
* The function signbitf4 returns an unsigned int vector in which each
* element is defined as:
* - ULLONG_MAX (0xFFFFFFFFFFFFFFFF) if the sign bit is set for the
* corresponding element of x
* - 0 (0x0000000000000000) otherwise.
*/
static __inline vector unsigned long long _signbitd2(vector double x)
{
vec_uchar16 shuf = ((vec_uchar16){0, 1, 2, 3, 0, 1, 2, 3, 8, 9, 10, 11, 8, 9, 10, 11});
vec_uint4 r = spu_rlmaska((vec_uint4)x,-31);
return (vec_ullong2)spu_shuffle(r,r,shuf);
}
#endif /* _SIGNBITD2_H_ */
#endif /* __SPU__ */
