73 lines
3.0 KiB
C
73 lines
3.0 KiB
C
/* nextafterf4 - for each of four float slots,
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return the the next representable value after x in the direction fo y,
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if x is euqal to y, the result is y.
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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_NEXTAFTERF4_H___
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#define ___SIMD_MATH_NEXTAFTERF4_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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static inline vector float
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_nextafterf4(vector float x, vector float y)
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{
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vec_float4 x_not_dec, lala_inc, lala_dec;
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vec_uint4 abs_inc_number, abs_dec_number;
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vec_uint4 A, B;
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//abs_inc, abs_dec
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abs_inc_number = spu_sel(spu_splats((unsigned int)0x800000), spu_add((vec_uint4)x, spu_splats((unsigned int)0x1)), spu_cmpabsgt(x, spu_splats(0.0f)));
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abs_dec_number = (vec_uint4)spu_add((vec_float4)spu_sub((vec_uint4)x, spu_splats((unsigned int)0x1)), spu_splats(0.0f));
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//x<= y
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A= spu_andc(abs_inc_number, spu_splats((unsigned int)0x80000000));
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// in < 0
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B= abs_dec_number;
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lala_inc = spu_sel((vec_float4)A, (vec_float4)B, spu_cmpgt(spu_splats(0.0f), x));
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// in <=0, abs_inc ( if in==0, set result's sign to -)
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//A= spu_or(spu_splats((unsigned int)0x80000000), spu_andc(abs_inc_number, spu_splats((unsigned int)0x80000000)));
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A= spu_or(abs_inc_number, spu_splats((unsigned int)0x80000000));
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// in > 0
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B = abs_dec_number;
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lala_dec = spu_sel((vec_float4)A, (vec_float4)B, spu_cmpgt(x, spu_splats(0.0f)));
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x_not_dec = spu_sel(y, lala_inc, spu_cmpgt(y, x));
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// (x <= y) || (x > y)
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return spu_sel(x_not_dec, lala_dec, spu_cmpgt(x, y));
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}
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#endif
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