87 lines
4.2 KiB
C
87 lines
4.2 KiB
C
/* logbd2 - for each element of vector x, return the exponent of normalized double x' as floating point value
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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_LOGBD2_H___
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#define ___SIMD_MATH_LOGBD2_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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static inline vector double
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_logbd2 (vector double x)
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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 odd = (vec_uchar16)(vec_uint4){ 0x04050607, 0x04050607, 0x0c0d0e0f, 0x0c0d0e0f };
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vec_uchar16 swapEvenOdd = (vec_uchar16)(vec_uint4){ 0x04050607, 0x00010203, 0x0c0d0e0f, 0x08090a0b };
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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_double2 logb = (vec_double2)zero;
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vec_llong2 e1, e2;
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vec_uint4 cmpgt, cmpeq, cmpzr;
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vec_int4 lz, lz0, lz1;
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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( spu_shuffle( cmpgt, cmpgt, even ),
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spu_and( spu_shuffle( cmpeq, cmpeq, even ),
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spu_shuffle( cmpgt, cmpgt, odd ) ) );
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logb = spu_sel( logb, (vec_double2)spu_splats(0x7FF8000000000000ll), 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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logb = spu_sel( logb, (vec_double2)spu_splats(__builtin_huge_val()), isinf );
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//HUGE_VAL: 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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logb = spu_sel( logb, (vec_double2)spu_splats(-__builtin_huge_val()), iszero );
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//Integer Exponent: if x is normal or subnormal, return unbiased exponent of normalized double x
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e1 = (vec_llong2)spu_and( (vec_llong2)x, (vec_llong2)expn );
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e2 = (vec_llong2)spu_rlmask((vec_uint4)e1, -20);
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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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lz0 = spu_sel( (vec_int4)zero, spu_sub( lz0, spu_splats((int)12) ), spu_cmpgt( lz0, (int)11 ) );
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lz1 = spu_sel( (vec_int4)zero, spu_shuffle( lz, lz, odd), spu_cmpeq( lz0, (int)20 ) );
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logb = spu_sel( logb, spu_extend( spu_convtf( spu_sub( spu_sub( (vec_int4)e2, spu_splats((int)1023) ), spu_add( lz0, lz1 ) ), 0 ) ),
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spu_nor( isnan, spu_or( isinf, iszero ) ) );
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return logb;
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}
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#endif
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