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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__ */ |
