added updated version of simdmathlibrary-1.0.1
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ejcoumans
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Extras/simdmathlibrary/spu/simdmath/frexpd2.h
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Extras/simdmathlibrary/spu/simdmath/frexpd2.h
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/* frexpd2 - for each element of vector x, return the normalized fraction and store the exponent of x'
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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_FREXPD2_H___
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#define ___SIMD_MATH_FREXPD2_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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#include <math.h>
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#define __FREXPD_DBL_NAN 0x7FF8000000000000ull
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static inline vector double
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_frexpd2 (vector double x, vector signed long long *pexp)
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{
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vec_uchar16 even = (vec_uchar16)(vec_uint4){ 0x00010203, 0x00010203, 0x08090a0b, 0x08090a0b };
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vec_uchar16 swapEvenOdd = (vec_uchar16)(vec_uint4){ 0x04050607, 0x00010203, 0x0c0d0e0f, 0x08090a0b };
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vec_ullong2 maskdw = (vec_ullong2){0xffffffffffffffffull, 0ull};
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vec_ullong2 sign = spu_splats(0x8000000000000000ull);
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vec_ullong2 expn = spu_splats(0x7ff0000000000000ull);
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vec_ullong2 zero = spu_splats(0x0000000000000000ull);
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vec_ullong2 isnan, isinf, iszero;
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vec_ullong2 e0, x0, x1;
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vec_uint4 cmpgt, cmpeq, cmpzr;
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vec_int4 lz, lz0, sh, ex;
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vec_double2 fr, frac = (vec_double2)zero;
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//NAN: x is NaN (all-ones exponent and non-zero mantissa)
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cmpgt = spu_cmpgt( (vec_uint4)spu_or( (vec_ullong2)x, sign ), (vec_uint4)spu_or(sign, expn) );
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cmpeq = spu_cmpeq( (vec_uint4)spu_or( (vec_ullong2)x, sign ), (vec_uint4)spu_or(sign, expn) );
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isnan = (vec_ullong2)spu_or( cmpgt, spu_and( cmpeq, spu_rlqwbyte( cmpgt, -4 ) ) );
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isnan = (vec_ullong2)spu_shuffle( isnan, isnan, even );
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frac = spu_sel( frac, (vec_double2)spu_splats(__FREXPD_DBL_NAN), isnan );
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//INF: x is infinite (all-ones exponent and zero mantissa)
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isinf = (vec_ullong2)spu_and( cmpeq, spu_shuffle( cmpeq, cmpeq, swapEvenOdd ) );
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frac = spu_sel( frac, x , isinf );
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//x is zero (zero exponent and zero mantissa)
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cmpzr = spu_cmpeq( (vec_uint4)spu_andc( (vec_ullong2)x, sign ), (vec_uint4)zero );
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iszero = (vec_ullong2)spu_and( cmpzr, spu_shuffle( cmpzr, cmpzr, swapEvenOdd ) );
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frac = spu_sel( frac, (vec_double2)zero , iszero );
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*pexp = spu_sel( *pexp, (vec_llong2)zero , iszero );
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//Integer Exponent: if x is normal or subnormal
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//...shift left to normalize fraction, zero shift if normal
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lz = (vec_int4)spu_cntlz( (vec_uint4)spu_andc( (vec_ullong2)x, sign) );
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lz0 = (vec_int4)spu_shuffle( lz, lz, even );
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sh = spu_sel( (vec_int4)zero, spu_sub( lz0, spu_splats((int)11) ), spu_cmpgt( lz0, (int)11 ) );
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sh = spu_sel( sh, spu_add( sh, lz ), spu_cmpeq( lz0, (int)32 ) );
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x0 = spu_slqw( spu_slqwbytebc( spu_and( (vec_ullong2)x, maskdw ), spu_extract(sh, 1) ), spu_extract(sh, 1) );
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x1 = spu_slqw( spu_slqwbytebc( (vec_ullong2)x, spu_extract(sh, 3) ), spu_extract(sh, 3) );
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fr = (vec_double2)spu_sel( x1, x0, maskdw );
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fr = spu_sel( fr, (vec_double2)spu_splats(0x3FE0000000000000ull), expn );
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fr = spu_sel( fr, x, sign );
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e0 = spu_rlmaskqw( spu_rlmaskqwbyte(spu_and( (vec_ullong2)x, expn ),-6), -4 );
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ex = spu_sel( spu_sub( (vec_int4)e0, spu_splats((int)1022) ), spu_sub( spu_splats((int)-1021), sh ), spu_cmpgt( sh, (int)0 ) );
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frac = spu_sel( frac, fr, spu_nor( isnan, spu_or( isinf, iszero ) ) );
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*pexp = spu_sel( *pexp, spu_extend( ex ), spu_nor( isnan, spu_or( isinf, iszero ) ) );
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return frac;
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}
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#endif
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