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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [machine/] [spu/] [headers/] [log1pd2.h] - Rev 207
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/* -------------------------------------------------------------- */ /* (C)Copyright 2007,2008, */ /* International Business Machines Corporation */ /* All Rights Reserved. */ /* */ /* Redistribution and use in source and binary forms, with or */ /* without modification, are permitted provided that the */ /* following conditions are met: */ /* */ /* - Redistributions of source code must retain the above copyright*/ /* notice, this list of conditions and the following disclaimer. */ /* */ /* - Redistributions in binary form must reproduce the above */ /* copyright notice, this list of conditions and the following */ /* disclaimer in the documentation and/or other materials */ /* provided with the distribution. */ /* */ /* - Neither the name of IBM Corporation nor the names of its */ /* contributors may be used to endorse or promote products */ /* derived from this software without specific prior written */ /* permission. */ /* */ /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */ /* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */ /* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ /* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */ /* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */ /* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */ /* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */ /* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */ /* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */ /* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ /* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */ /* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ /* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* -------------------------------------------------------------- */ /* PROLOG END TAG zYx */ #ifdef __SPU__ #ifndef _LOG1PD2_H_ #define _LOG1PD2_H_ 1 #include <spu_intrinsics.h> #include "simdmath.h" #include "logd2.h" #include "divd2.h" #define LOG1PD2_P0 0.0000000000000000000000000e+00 #define LOG1PD2_P1 1.0000000000000000000000000e+00 #define LOG1PD2_P2 2.3771612265431403265836252e+00 #define LOG1PD2_P3 2.0034423569559494104908026e+00 #define LOG1PD2_P4 7.1309327316770110272159400e-01 #define LOG1PD2_P5 9.8219761968547217301228613e-02 #define LOG1PD2_P6 3.4385125174546914139650511e-03 #define LOG1PD2_Q0 1.0000000000000000000000000e+00 #define LOG1PD2_Q1 2.8771612265431403265836252e+00 #define LOG1PD2_Q2 3.1086896368941925317130881e+00 #define LOG1PD2_Q3 1.5583843494335058998956356e+00 #define LOG1PD2_Q4 3.6047236436186669283898709e-01 #define LOG1PD2_Q5 3.2620075387969869884496887e-02 #define LOG1PD2_Q6 6.8047193336239690346356479e-04 /* * FUNCTION * vector double _log1pd2(vector double x) * * DESCRIPTION * The function _log1pd2 computes the natural logarithm of x + 1 * for each of the double word elements of x. * */ static __inline vector double _log1pd2(vector double x) { vector double oned = spu_splats(1.0); vector double rangehi = spu_splats(0.35); vector double rangelo = spu_splats(0.0); vector unsigned long long use_log; vector double pr, qr; vector double eresult; vector double rresult; vector double result; /* Compiler Bug. Replace xbug with x when spu_cmp*() doesn't * modify it's arguments! */ volatile vector double xbug = x; use_log = spu_or(spu_cmpgt(xbug, rangehi), spu_cmpgt(rangelo, xbug)); /* * Calculate directly using log(x+1) */ eresult = _logd2(spu_add(x, oned)); /* * For x in [0.0,0.35], use a rational approximation. */ pr = spu_madd(x, spu_splats(LOG1PD2_P6), spu_splats(LOG1PD2_P5)); qr = spu_madd(x, spu_splats(LOG1PD2_Q6), spu_splats(LOG1PD2_Q5)); pr = spu_madd(pr, x, spu_splats(LOG1PD2_P4)); qr = spu_madd(qr, x, spu_splats(LOG1PD2_Q4)); pr = spu_madd(pr, x, spu_splats(LOG1PD2_P3)); qr = spu_madd(qr, x, spu_splats(LOG1PD2_Q3)); pr = spu_madd(pr, x, spu_splats(LOG1PD2_P2)); qr = spu_madd(qr, x, spu_splats(LOG1PD2_Q2)); pr = spu_madd(pr, x, spu_splats(LOG1PD2_P1)); qr = spu_madd(qr, x, spu_splats(LOG1PD2_Q1)); pr = spu_madd(pr, x, spu_splats(LOG1PD2_P0)); qr = spu_madd(qr, x, spu_splats(LOG1PD2_Q0)); rresult = _divd2(pr, qr); /* * Select either direct calculation or rational approximation. */ result = spu_sel(rresult, eresult, use_log); return result; } #endif /* _LOG1PD2_H_ */ #endif /* __SPU__ */