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3 | /* International Business Machines Corporation */ |
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22 | /* */ |
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23 | /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */ |
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36 | /* -------------------------------------------------------------- */ |
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37 | /* PROLOG END TAG zYx */ |
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38 | #ifdef __SPU__ |
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39 | #ifndef _SIGNBITD2_H_ |
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40 | #define _SIGNBITD2_H_ 1 |
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41 | |
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42 | #include <spu_intrinsics.h> |
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43 | |
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44 | /* |
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45 | * FUNCTION |
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46 | * vector unsigned long long _signbitd2(vector double x) |
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47 | * |
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48 | * DESCRIPTION |
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49 | * The signbitd2 function returns a vector which contains either all ones |
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50 | * or all zeros, depending on the sign of the corresponding input vector |
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51 | * element. |
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52 | * |
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53 | * Note that the signbit functions are not logically equivalent to |
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54 | * x < 0.0. IEEE 754 floating point rules include a signed zero, so if |
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55 | * the input value is –0.0, signbit will return non-zero, but the naive |
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56 | * implementation will not. |
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57 | * |
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58 | * RETURNS |
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59 | * The function signbitf4 returns an unsigned int vector in which each |
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60 | * element is defined as: |
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61 | * |
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62 | * - ULLONG_MAX (0xFFFFFFFFFFFFFFFF) if the sign bit is set for the |
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63 | * corresponding element of x |
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64 | * - 0 (0x0000000000000000) otherwise. |
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65 | * |
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66 | */ |
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67 | static __inline vector unsigned long long _signbitd2(vector double x) |
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68 | { |
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69 | vec_uchar16 shuf = ((vec_uchar16){0, 1, 2, 3, 0, 1, 2, 3, 8, 9, 10, 11, 8, 9, 10, 11}); |
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70 | vec_uint4 r = spu_rlmaska((vec_uint4)x,-31); |
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71 | return (vec_ullong2)spu_shuffle(r,r,shuf); |
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72 | } |
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73 | #endif /* _SIGNBITD2_H_ */ |
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74 | #endif /* __SPU__ */ |
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