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Diffstat (limited to 'newlib/libm/machine/spu/headers/log1pd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/log1pd2.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/log1pd2.h b/newlib/libm/machine/spu/headers/log1pd2.h new file mode 100644 index 000000000..0433f37b8 --- /dev/null +++ b/newlib/libm/machine/spu/headers/log1pd2.h @@ -0,0 +1,137 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* 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. */ +/* 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__ */ |