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Diffstat (limited to 'newlib/libm/machine/spu/headers/cbrtf.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/cbrtf.h | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/newlib/libm/machine/spu/headers/cbrtf.h b/newlib/libm/machine/spu/headers/cbrtf.h deleted file mode 100644 index 2fd95af01..000000000 --- a/newlib/libm/machine/spu/headers/cbrtf.h +++ /dev/null @@ -1,130 +0,0 @@ -/* - (C) Copyright 2001,2006, - 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 names of the copyright holders nor the names of their - 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. -*/ -#ifndef _CBRTF_H_ -#define _CBRTF_H_ 1 - -#include <spu_intrinsics.h> -#include "headers/vec_literal.h" - -static double cbrt_factors[5] = { - 0.629960524947436484311, /* 2^(-2/3) */ - 0.793700525984099680699, /* 2^(-1/3) */ - 1.0, /* 2^(0) */ - 1.259921049894873164666, /* 2^(1/3) */ - 1.587401051968199583441 /* 2^(2/3) */ -}; - -/* Compute the cube root of the floating point input x. - */ - -static __inline float _cbrtf(float x) -{ - vec_int4 exp, bias; - vec_uint4 mask, e_div_3, e_mod_3; - vec_uint4 mant_mask = VEC_SPLAT_U32(0x7FFFFF); - vec_float4 in; - vec_float4 half = VEC_SPLAT_F32(0.5f); - vec_float4 onef = VEC_SPLAT_F32(1.0f); - vec_float4 out, mant, ym, bf, inv_bf; - vec_double2 two = VEC_SPLAT_F64(2.0); - /* Polynomial coefficients */ - vec_double2 c2 = VEC_SPLAT_F64(0.191502161678719066); - vec_double2 c1 = VEC_SPLAT_F64(0.697570460207922770); - vec_double2 c0 = VEC_SPLAT_F64(0.492659620528969547); - vec_double2 a0, b0, inv_b0, ym0; - vec_double2 mant0, u0, u0_3, factor0; - - in = spu_promote(x, 0); - - /* Normalize the mantissa (fraction part) into the range [0.5, 1.0) and - * extract the exponent. - */ - mant = spu_sel(half, in, mant_mask); - exp = spu_and(spu_rlmask((vec_int4)in, -23), 0xFF); - - /* Generate mask used to zero result if the exponent is zero (ie, in is either - * zero or a denorm - */ - mask = spu_cmpeq(exp, 0); - exp = spu_add(exp, -126); - - mant0 = spu_extend(mant); - - u0 = spu_madd(mant0, spu_nmsub(mant0, c2, c1), c0); - u0_3 = spu_mul(spu_mul(u0, u0), u0); - - /* Compute: e_div_3 = exp/3 - * - * Fetch: factor = factor[2+exp%3] - * - * The factors array contains 5 values: 2^(-2/3), 2^(-1/3), 2^0, 2^(1/3), 2^(2/3), 2^1. - */ - bias = spu_rlmask(spu_rlmaska(exp, -15), -16); - e_div_3 = (vec_uint4)spu_rlmaska(spu_madd((vec_short8)exp, VEC_SPLAT_S16(0x5556), bias), -16); - - e_mod_3 = (vec_uint4)spu_sub((vec_int4)(exp), spu_mulo((vec_short8)e_div_3, VEC_SPLAT_S16(3))); - - e_mod_3 = spu_add(e_mod_3, 2); - - factor0 = spu_promote(cbrt_factors[spu_extract(e_mod_3, 0)], 0); - - /* Compute the estimated mantissa cube root (ym) equals: - * ym = (u * factor * (2.0 * mant + u3)) / (2.0 * u3 + mant); - */ - a0 = spu_mul(spu_mul(factor0, u0), spu_madd(two, mant0, u0_3)); - b0 = spu_madd(two, u0_3, mant0); - - bf = spu_roundtf(b0); - - inv_bf = spu_re(bf); - inv_bf = spu_madd(spu_nmsub(bf, inv_bf, onef), inv_bf, inv_bf); - - inv_b0 = spu_extend(inv_bf); - - ym0 = spu_mul(a0, inv_b0); - ym0 = spu_madd(spu_nmsub(b0, ym0, a0), inv_b0, ym0); - - ym = spu_roundtf(ym0); - - /* Merge sign, computed exponent, and computed mantissa. - */ - exp = spu_rl(spu_add((vec_int4)e_div_3, 127), 23); - out = spu_sel((vec_float4)exp, in, VEC_SPLAT_U32(0x80000000)); - out = spu_mul(out, ym); - - out = spu_andc(out, (vec_float4)mask); - - return (spu_extract(out, 0)); -} - -#endif /* _CBRTF_H_ */ |