83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* acosf4 -
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Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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All rights reserved.
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Redistribution and use in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Sony Computer Entertainment Inc nor the names
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of its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ___SIMD_MATH_ACOSF4_H___
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#define ___SIMD_MATH_ACOSF4_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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#include <simdmath/sqrtf4.h>
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//
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// Computes the inverse cosine of all four slots of x
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//
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static inline vector float
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_acosf4 (vector float x)
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{
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vec_float4 result, xabs;
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vec_float4 t1;
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vec_float4 xabs2, xabs4;
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vec_float4 hi, lo;
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vec_float4 neg, pos;
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vec_uint4 select;
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xabs = (vec_float4)(spu_rlmask(spu_sl((vec_uint4)(x), 1), -1));
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select = (vec_uint4)(spu_rlmaska((vector signed int)(x), -31));
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t1 = _sqrtf4(spu_sub( spu_splats(1.0f), xabs));
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/* Instruction counts can be reduced if the polynomial was
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* computed entirely from nested (dependent) fma's. However,
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* to reduce the number of pipeline stalls, the polygon is evaluated
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* in two halves (hi amd lo).
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*/
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xabs2 = spu_mul(xabs, xabs);
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xabs4 = spu_mul(xabs2, xabs2);
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hi = spu_madd(spu_splats(-0.0012624911f), xabs, spu_splats(0.0066700901f));
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hi = spu_madd(hi, xabs, spu_splats(-0.0170881256f));
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hi = spu_madd(hi, xabs, spu_splats( 0.0308918810f));
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lo = spu_madd(spu_splats(-0.0501743046f), xabs, spu_splats(0.0889789874f));
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lo = spu_madd(lo, xabs, spu_splats(-0.2145988016f));
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lo = spu_madd(lo, xabs, spu_splats( 1.5707963050f));
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result = spu_madd(hi, xabs4, lo);
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/* Adjust the result if x is negactive.
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*/
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neg = spu_nmsub(t1, result, spu_splats(3.1415926535898f));
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pos = spu_mul(t1, result);
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result = spu_sel(pos, neg, select);
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return result;
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}
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#endif
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