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Diffstat (limited to 'newlib/libm/machine/spu/headers/erfcd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/erfcd2.h | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/newlib/libm/machine/spu/headers/erfcd2.h b/newlib/libm/machine/spu/headers/erfcd2.h deleted file mode 100644 index 9112fdd70..000000000 --- a/newlib/libm/machine/spu/headers/erfcd2.h +++ /dev/null @@ -1,126 +0,0 @@ -/* -------------------------------------------------------------- */ -/* (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 _ERFCD2_H_ -#define _ERFCD2_H_ 1 - -#include <spu_intrinsics.h> - -#include "expd2.h" -#include "recipd2.h" -#include "divd2.h" -#include "erf_utils.h" - -/* - * FUNCTION - * vector double _erfcd2(vector double x) - * - * DESCRIPTION - * The erfcd2 function computes the complement error function of each element of x. - * - * Accuracy Note: We would benefit from a rational approximation in the domain - * 1.2 < x < 2.0 and also around x = 2.5. - * - * C99 Special Cases: - * - erfc(+0) returns +1 - * - erfc(-0) returns +1 - * - erfc(+infinite) returns +0 - * - erfc(-infinite) returns +2 - * - * Other Cases: - * - erfc(Nan) returns Nan - * - */ - -static __inline vector double _erfcd2(vector double x) -{ - vec_uchar16 dup_even = ((vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }); - vec_double2 onehalfd = spu_splats(0.5); - vec_double2 zerod = spu_splats(0.0); - vec_double2 oned = spu_splats(1.0); - vec_double2 twod = spu_splats(2.0); - vec_double2 sign_mask = spu_splats(-0.0); - - /* This is where we switch from near zero approx. */ - vec_float4 approx_point = spu_splats(1.71f); - - vec_double2 xabs, xsqu, xsign; - vec_uint4 isneg; - vec_double2 tresult, presult, result; - - xsign = spu_and(x, sign_mask); - xabs = spu_andc(x, sign_mask); - xsqu = spu_mul(x, x); - - /* - * Use Taylor Series for x near 0 - * Preserve sign of x in result, since erf(-x) = -erf(x) - * This approximation is for erf, so adjust for erfc. - */ - TAYLOR_ERF(xabs, xsqu, tresult); - tresult = spu_or(tresult, xsign); - tresult = spu_sub(oned, tresult); - - /* - * Now, use the Continued Fractions approximation away - * from 0. If x < 0, use erfc(-x) = 2 - erfc(x) - */ - CONTFRAC_ERFC(xabs, xsqu, presult); - isneg = (vec_uint4)spu_shuffle(x, x, dup_even); - isneg = spu_rlmaska(isneg, -32); - presult = spu_sel(presult, spu_sub(twod, presult), (vec_ullong2)isneg); - - /* - * Select the appropriate approximation. - */ - vec_float4 xf = spu_roundtf(xabs); - xf = spu_shuffle(xf, xf, dup_even); - result = spu_sel(tresult, presult, (vec_ullong2)spu_cmpgt(xf, approx_point)); - - /* - * Special cases - */ - result = spu_sel(result, twod, spu_testsv(x, SPU_SV_NEG_INFINITY)); - result = spu_sel(result, zerod, spu_testsv(x, SPU_SV_POS_INFINITY)); - result = spu_sel(result, x, spu_testsv(x, SPU_SV_NEG_DENORM | SPU_SV_POS_DENORM)); - - return result; -} - -#endif /* _ERFCD2_H_ */ -#endif /* __SPU__ */ |