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Diffstat (limited to 'newlib/libm/machine/spu/headers/recipd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/recipd2.h | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/newlib/libm/machine/spu/headers/recipd2.h b/newlib/libm/machine/spu/headers/recipd2.h deleted file mode 100644 index b53d4efc8..000000000 --- a/newlib/libm/machine/spu/headers/recipd2.h +++ /dev/null @@ -1,168 +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: - * a) X[i+1] = X[i] * (2.0 - b*X[i]) - * or - * b) X[i+1] = X[i] + X[i]*(1.0 - X[i]*b) - * where b is the input value to be inverted - * - * The later (b) form improves the accuracy to 99.95% correctly rounded. - */ -static __inline vector double _recipd2(vector double value_in) -{ - vec_float4 x0; - vec_float4 value; - vec_float4 one = spu_splats(1.0f); - vec_double2 one_d = spu_splats(1.0); - vec_double2 x1, x2, x3; - vec_double2 scale; - vec_double2 exp, value_d; - vec_ullong2 expmask = spu_splats(0x7FF0000000000000ULL); - vec_ullong2 is0inf; - -#ifdef __SPU_EDP__ - vec_ullong2 isdenorm; - vec_ullong2 expmask_minus1 = spu_splats(0x7FE0000000000000ULL); - - /* Determine special input values. For example, if the input is a denorm, infinity or 0 */ - - isdenorm = spu_testsv(value_in, (SPU_SV_POS_DENORM | SPU_SV_NEG_DENORM)); - is0inf = spu_testsv(value_in, (SPU_SV_NEG_ZERO | SPU_SV_POS_ZERO | - SPU_SV_NEG_INFINITY | SPU_SV_POS_INFINITY)); - - /* Scale the divisor to correct for double precision floating - * point exponents that are out of single precision range. - */ - exp = spu_and(value_in, (vec_double2)expmask); - scale = spu_xor(exp, (vec_double2)spu_sel(expmask, expmask_minus1, isdenorm)); - value_d = spu_mul(value_in, scale); - value = spu_roundtf(value_d); - - /* Perform reciprocal with 1 single precision and 2 double precision - * Newton-Raphson iterations. - */ - x0 = spu_re(value); - x1 = spu_extend(spu_madd(spu_nmsub(value, x0, one), x0, x0)); - x2 = spu_madd(spu_nmsub(value_d, x1, one_d), x1, x1); - x3 = spu_madd(spu_nmsub(value_d, x2, one_d), x2, x2); - x3 = spu_sel(spu_mul(x3, scale), spu_xor(value_in, (vector double)expmask), is0inf); - -#else /* !__SPU_EDP__ */ - - vec_uint4 isinf, iszero, isdenorm0; - vec_double2 value_abs; - vec_double2 sign = spu_splats(-0.0); - vec_double2 denorm_scale = (vec_double2)spu_splats(0x4330000000000000ULL); - vec_double2 exp_53 = (vec_double2)spu_splats(0x0350000000000000ULL); - vec_uchar16 splat_hi = (vec_uchar16){0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11}; - vec_uchar16 swap = (vec_uchar16){4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11}; - - value_abs = spu_andc(value_in, sign); - exp = spu_and(value_in, (vec_double2)expmask); - - /* Determine if the input is a special value. These include: - * denorm - then we must coerce it to a normal value. - * zero - then we must return an infinity - * infinity - then we must return a zero. - */ - isdenorm0 = spu_cmpeq(spu_shuffle((vec_uint4)exp, (vec_uint4)exp, splat_hi), 0); - - isinf = spu_cmpeq((vec_uint4)value_abs, (vec_uint4)expmask); - iszero = spu_cmpeq((vec_uint4)value_abs, 0); - isinf = spu_and(isinf, spu_shuffle(isinf, isinf, swap)); - iszero = spu_and(iszero, spu_shuffle(iszero, iszero, swap)); - is0inf = (vec_ullong2)spu_or(isinf, iszero); - - /* If the inputs is a denorm, we must first convert it to a normal number since - * arithmetic operations on denormals produces 0 on Cell/B.E. - */ - value_d = spu_sub(spu_or(value_abs, exp_53), exp_53); - value_d = spu_sel(value_abs, value_d, (vec_ullong2)isdenorm0); - - /* Scale the divisor to correct for double precision floating - * point exponents that are out of single precision range. - */ - scale = spu_xor(spu_and(value_d, (vec_double2)expmask), (vec_double2)expmask); - value_d = spu_mul(value_d, scale); - value = spu_roundtf(value_d); - - /* Perform reciprocal with 1 single precision and 2 double precision - * Newton-Raphson iterations. The bias is removed after the single - * precision iteration. - */ - x0 = spu_re(value); - x1 = spu_extend(spu_madd(spu_nmsub(value, x0, one), x0, x0)); - x2 = spu_madd(spu_nmsub(value_d, x1, one_d), x1, x1); - x3 = spu_madd(spu_nmsub(value_d, x2, one_d), x2, x2); - x3 = spu_mul(x3, spu_sel(scale, value_in, (vec_ullong2)sign)); - x3 = spu_sel(x3, spu_mul(x3, denorm_scale), (vec_ullong2)isdenorm0); - x3 = spu_sel(x3, spu_xor(value_in, (vector double)expmask), is0inf); - -#endif /* __SPU_EDP__ */ - - return (x3); -} - -#endif /* _RECIPD2_H_ */ -#endif /* __SPU__ */ |