1 | /* -------------------------------------------------------------- */ |
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2 | /* (C)Copyright 2001,2008, */ |
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3 | /* International Business Machines Corporation, */ |
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4 | /* Sony Computer Entertainment, Incorporated, */ |
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5 | /* Toshiba Corporation, */ |
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6 | /* */ |
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7 | /* All Rights Reserved. */ |
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10 | /* without modification, are permitted provided that the */ |
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11 | /* following conditions are met: */ |
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13 | /* - Redistributions of source code must retain the above copyright*/ |
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14 | /* notice, this list of conditions and the following disclaimer. */ |
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15 | /* */ |
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16 | /* - Redistributions in binary form must reproduce the above */ |
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17 | /* copyright notice, this list of conditions and the following */ |
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18 | /* disclaimer in the documentation and/or other materials */ |
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19 | /* provided with the distribution. */ |
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20 | /* */ |
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21 | /* - Neither the name of IBM Corporation nor the names of its */ |
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22 | /* contributors may be used to endorse or promote products */ |
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23 | /* derived from this software without specific prior written */ |
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24 | /* permission. */ |
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25 | /* */ |
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26 | /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */ |
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27 | /* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */ |
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28 | /* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ |
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29 | /* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */ |
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30 | /* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */ |
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31 | /* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */ |
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38 | /* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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39 | /* -------------------------------------------------------------- */ |
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40 | /* PROLOG END TAG zYx */ |
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41 | #ifdef __SPU__ |
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42 | |
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43 | #ifndef _LDEXPD2_H_ |
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44 | #define _LDEXPD2_H_ 1 |
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45 | |
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46 | #include <spu_intrinsics.h> |
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47 | |
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48 | /* |
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49 | * FUNCTION |
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50 | * vector double _ldexpd2(vector double x, vector signed long long exp) |
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51 | * |
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52 | * DESCRIPTION |
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53 | * The _ldexpd2 function Computes x * 2^exp for each of the two elements |
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54 | * of x using the corresponding elements of exp. |
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55 | * |
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56 | */ |
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57 | static __inline vector double _ldexpd2(vector double x, vector signed long long llexp) |
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58 | { |
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59 | vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80, |
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60 | 12,13,14,15, 0x80,0x80,0x80,0x80 }); |
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61 | vec_int4 exp; |
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62 | vec_int4 e1, e2; |
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63 | vec_int4 min = spu_splats(-2044); |
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64 | vec_int4 max = spu_splats(2046); |
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65 | vec_uint4 cmp_min, cmp_max; |
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66 | vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 }; |
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67 | vec_double2 f1, f2; |
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68 | vec_double2 out; |
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69 | |
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70 | exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even); |
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71 | |
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72 | /* Clamp the specified exponent to the range -2044 to 2046. |
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73 | */ |
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74 | |
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75 | cmp_min = spu_cmpgt(exp, min); |
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76 | cmp_max = spu_cmpgt(exp, max); |
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77 | exp = spu_sel(min, exp, cmp_min); |
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78 | exp = spu_sel(exp, max, cmp_max); |
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79 | |
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80 | /* Generate the factors f1 = 2^e1 and f2 = 2^e2 |
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81 | */ |
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82 | e1 = spu_rlmaska(exp, -1); |
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83 | e2 = spu_sub(exp, e1); |
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84 | |
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85 | f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift); |
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86 | f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift); |
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87 | |
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88 | /* Compute the product x * 2^e1 * 2^e2 |
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89 | */ |
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90 | out = spu_mul(spu_mul(x, f1), f2); |
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91 | |
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92 | return (out); |
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93 | } |
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94 | |
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95 | #endif /* _LDEXPD2_H_ */ |
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96 | #endif /* __SPU__ */ |
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97 | |
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