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Diffstat (limited to 'newlib/libm/machine/spu/headers/sqrtd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/sqrtd2.h | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/newlib/libm/machine/spu/headers/sqrtd2.h b/newlib/libm/machine/spu/headers/sqrtd2.h deleted file mode 100644 index b5c527b13..000000000 --- a/newlib/libm/machine/spu/headers/sqrtd2.h +++ /dev/null @@ -1,150 +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 _SQRTD2_H_ -#define _SQRTD2_H_ 1 - -#include <spu_intrinsics.h> - -/* - * FUNCTION - * vector double _sqrtd2(vector double in) - * - * DESCRIPTION - * The _sqrtd2 function computes the square root of the vector input "in" - * and returns the result. - * - */ -static __inline vector double _sqrtd2(vector double in) -{ - vec_int4 bias_exp; - vec_uint4 exp; - vec_float4 fx, fg, fy, fd, fe, fy2, fhalf; - vec_ullong2 nochange, denorm; - vec_ullong2 mask = spu_splats(0x7FE0000000000000ULL); - vec_double2 dx, de, dd, dy, dg, dy2, dhalf; - vec_double2 neg; - vec_double2 one = spu_splats(1.0); - vec_double2 two_pow_52 = (vec_double2)spu_splats(0x4330000000000000ULL); - - /* If the input is a denorm, then multiply it by 2^52 so that the input is no - * longer denormal. - */ - exp = (vec_uint4)spu_and((vec_ullong2)in, spu_splats(0xFFF0000000000000ULL)); - denorm = (vec_ullong2)spu_cmpeq(exp,0); - - in = spu_mul(in, spu_sel(one, two_pow_52, denorm)); - - fhalf = spu_splats(0.5f); - dhalf = spu_splats(0.5); - - /* Coerce the input, in, into the argument reduced space [0.5, 2.0). - */ - dx = spu_sel(in, dhalf, mask); - - /* Compute an initial single precision guess for the square root (fg) - * and half reciprocal (fy2). - */ - fx = spu_roundtf(dx); - - fy2 = spu_rsqrte(fx); - fy = spu_mul(fy2, fhalf); - fg = spu_mul(fy2, fx); /* 12-bit approximation to sqrt(cx) */ - - /* Perform one single precision Newton-Raphson iteration to improve - * accuracy to about 22 bits. - */ - fe = spu_nmsub(fy, fg, fhalf); - fd = spu_nmsub(fg, fg, fx); - - fy = spu_madd(fy2, fe, fy); - fg = spu_madd(fy, fd, fg); /* 22-bit approximation */ - - dy = spu_extend(fy); - dg = spu_extend(fg); - - /* Perform two double precision Newton-Raphson iteration to improve - * accuracy to about 44 and 88 bits repectively. - */ - dy2 = spu_add(dy, dy); - de = spu_nmsub(dy, dg, dhalf); - dd = spu_nmsub(dg, dg, dx); - dy = spu_madd(dy2, de, dy); - dg = spu_madd(dy, dd, dg); /* 44 bit approximation */ - - dd = spu_nmsub(dg, dg, dx); - dg = spu_madd(dy, dd, dg); /* full double precision approximation */ - - - /* Compute the expected exponent assuming that it is not a special value. - * See special value handling below. - */ - bias_exp = spu_rlmaska(spu_sub((vec_int4)spu_and((vec_ullong2)in, mask), - (vec_int4)spu_splats(0x3FE0000000000000ULL)), - -1); - - /* Adjust the exponent bias if the input was denormalized */ - bias_exp = spu_sub(bias_exp, (vec_int4)spu_and(spu_splats(0x01A0000000000000ULL), denorm)); - - dg = (vec_double2)spu_add((vec_int4)dg, bias_exp); - - /* Handle special inputs. These include: - * - * input output - * ========= ========= - * -0 -0 - * 0 0 - * +infinity +infinity - * NaN NaN - * <0 NaN - */ - exp = spu_shuffle(exp, exp, ((vec_uchar16) { 0,1,2,3,0,1,2,3, 8,9,10,11,8,9,10,11 })); - - neg = (vec_double2)spu_rlmaska((vec_int4)exp, -31); - nochange = spu_or((vec_ullong2)spu_cmpeq(exp, 0x7FF00000), - spu_cmpeq(in, spu_splats(0.0))); - - dg = spu_sel(spu_or(dg, neg), in, nochange); - - return (dg); -} -#endif /* _SQRTD2_H_ */ -#endif /* __SPU__ */ |