[444] | 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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| 8 | /* */ |
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| 9 | /* Redistribution and use in source and binary forms, with or */ |
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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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| 12 | /* */ |
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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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| 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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| 32 | /* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */ |
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| 33 | /* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */ |
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| 34 | /* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */ |
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| 35 | /* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ |
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| 36 | /* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */ |
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| 37 | /* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ |
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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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