[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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| 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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| 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 | #ifndef _TANF4_H_ |
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| 43 | #define _TANF4_H_ 1 |
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| 44 | |
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| 45 | #include <spu_intrinsics.h> |
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| 46 | |
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| 47 | #include "cos_sin.h" |
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| 48 | #include "divf4.h" |
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| 49 | |
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| 50 | /* |
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| 51 | * FUNCTION |
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| 52 | * vector float _tanf4(vector float angle) |
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| 53 | * |
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| 54 | * DESCRIPTION |
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| 55 | * The _tanf4 function computes the tangent of a vector of "angle"s |
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| 56 | * (expressed in radians) to an accuracy of single precision floating |
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| 57 | * point. |
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| 58 | * |
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| 59 | */ |
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| 60 | static __inline vector float _tanf4(vector float angle) |
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| 61 | { |
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| 62 | vec_int4 octant; |
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| 63 | vec_uint4 select; |
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| 64 | vec_float4 cos, sin; |
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| 65 | vec_float4 num, den; |
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| 66 | vec_float4 toggle_sign, answer; |
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| 67 | |
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| 68 | /* Range reduce the input angle x into the range -PI/4 to PI/4 |
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| 69 | * by performing simple modulus. |
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| 70 | */ |
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| 71 | MOD_PI_OVER_FOUR_F(angle, octant); |
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| 72 | |
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| 73 | /* Compute the cosine and sine of the range reduced input. |
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| 74 | */ |
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| 75 | COMPUTE_COS_SIN_F(angle, cos, sin); |
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| 76 | |
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| 77 | /* For each SIMD element, select the numerator, denominator, and sign |
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| 78 | * correction depending upon the octant of the original angle. |
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| 79 | * |
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| 80 | * octants angles numerator denominator sign toggle |
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| 81 | * ------- ------------ --------- ----------- ----------- |
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| 82 | * 0 0 to 45 sin cos no |
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| 83 | * 1,2 45 to 135 cos sin no,yes |
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| 84 | * 3,4 135 to 225 sin cos yes,no |
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| 85 | * 5,6 225 to 315 cos sin no,yes |
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| 86 | * 7 315 to 360 sin cos yes |
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| 87 | */ |
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| 88 | toggle_sign = (vec_float4)spu_sl(spu_and(octant, 2), 30); |
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| 89 | |
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| 90 | select = spu_cmpeq(spu_and(octant, 2), 0); |
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| 91 | num = spu_sel(cos, sin, select); |
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| 92 | den = spu_sel(sin, cos, select); |
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| 93 | |
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| 94 | answer = spu_xor(_divf4(num, den), toggle_sign); |
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| 95 | |
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| 96 | return (answer); |
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| 97 | } |
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| 98 | |
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| 99 | #endif /* _TANF4_H_ */ |
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| 100 | #endif /* __SPU__ */ |
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