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Diffstat (limited to 'newlib/libm/machine/spu/headers/recipd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/recipd2.h | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/newlib/libm/machine/spu/headers/recipd2.h b/newlib/libm/machine/spu/headers/recipd2.h deleted file mode 100644 index 0c701ec05..000000000 --- a/newlib/libm/machine/spu/headers/recipd2.h +++ /dev/null @@ -1,113 +0,0 @@ -/* -------------------------------------------------------------- */ -/* (C)Copyright 2001,2008, */ -/* International Business Machines Corporation, */ -/* Sony Computer Entertainment, Incorporated, */ -/* Toshiba 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 _RECIPD2_H_ -#define _RECIPD2_H_ 1 - -#include <spu_intrinsics.h> - - -/* - * FUNCTION - * vector double _recipd2(vector double value) - * - * DESCRIPTION - * The _recipd2 function inverts "value" and returns the result. - * Computation is performed using the single precision reciprocal - * estimate and interpolate instructions to produce a 12 accurate - * estimate. - * - * One (1) iteration of a Newton-Raphson is performed to improve - * accuracy to single precision floating point. Two additional double - * precision iterations are needed to achieve a full double - * preicision result. - * - * The Newton-Raphson iteration is of the form: - * X[i+1] = X[i] * (2.0 - b*X[i]) - * where b is the input value to be inverted - * - */ -static __inline vector double _recipd2(vector double value_d) -{ - vector unsigned long long expmask = (vector unsigned long long) { 0x7FF0000000000000ULL, 0x7FF0000000000000ULL }; - vector float x0; - vector float value; - vector float two = spu_splats(2.0f); - vector double two_d = spu_splats(2.0); - vector double x1, x2, x3; - vector double bias; - - /* Bias the divisor to correct for double precision floating - * point exponents that are out of single precision range. - */ - bias = spu_xor(spu_and(value_d, (vector double)expmask), (vector double)expmask); - - value = spu_roundtf(spu_mul(value_d, bias)); - x0 = spu_re(value); - x1 = spu_extend(spu_mul(x0, spu_nmsub(value, x0, two))); - x1 = spu_mul(x1, bias); - x2 = spu_mul(x1, spu_nmsub(value_d, x1, two_d)); - x3 = spu_mul(x2, spu_nmsub(value_d, x2, two_d)); - - /* Handle input = +/- infinity or +/-0. */ - -#ifdef __SPU_EDP__ - vec_ullong2 is0inf = spu_testsv(value_d, SPU_SV_NEG_ZERO | SPU_SV_POS_ZERO | - SPU_SV_NEG_INFINITY | SPU_SV_POS_INFINITY); -#else - vec_double2 nzero = spu_splats(-0.0); - vec_double2 xabs = spu_andc(value_d, nzero); - vector unsigned char swap = (vector unsigned char) {4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11}; - vec_uint4 isinf = spu_cmpeq((vec_uint4)xabs, (vec_uint4)expmask); - vec_uint4 iszero = spu_cmpeq((vec_uint4)xabs, 0); - isinf = spu_and(isinf, spu_shuffle(isinf, isinf, swap)); - iszero = spu_and(iszero, spu_shuffle(iszero, iszero, swap)); - vec_ullong2 is0inf = (vec_ullong2)spu_or(isinf, iszero); -#endif /* __SPU_EDP__ */ - - x3 = spu_sel(x3, spu_xor(value_d, (vector double)expmask), is0inf); - - return (x3); -} - -#endif /* _RECIPD2_H_ */ -#endif /* __SPU__ */ |