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Diffstat (limited to 'newlib/libm/machine/spu/headers/atanf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/atanf4.h | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/newlib/libm/machine/spu/headers/atanf4.h b/newlib/libm/machine/spu/headers/atanf4.h deleted file mode 100644 index 3fd803ce9..000000000 --- a/newlib/libm/machine/spu/headers/atanf4.h +++ /dev/null @@ -1,124 +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 _ATANF4_H_ -#define _ATANF4_H_ 1 - -#include <spu_intrinsics.h> - -#include "simdmath.h" -#include "recipf4.h" - -/* - * FUNCTION - * vector float _atanf4(vector float x) - * - * DESCRIPTION - * The _atanf4 function computes the arc tangent of a vector of values x; - * that is the values whose tangent is x. - * - * The _atanf4 function returns the arc tangents in radians and the value - * is mathematically defined to be in the range -PI/2 to PI/2. - * - * The arc tangent function is computed using a polynomial approximation - * (B. Carlson, M. Goldstein, Los Alamos Scientific Laboratory, 1955). - * __8__ - * \ - * \ - * atan(x) = / Ci*x^(2*i+1) - * /____ - * i=0 - * - * for x in the range -1 to 1. The remaining regions are defined to be: - * - * [1, infinity] : PI/2 + atanf(-1/x) - * [-infinity, -1] : -PI/2 + atanf(-1/x) - * - */ -static __inline vector float _atanf4(vector float x) -{ - vector float bias; - vector float x2, x3, x4, x8, x9; - vector float hi, lo; - vector float result; - vector float inv_x; - vector unsigned int sign; - vector unsigned int select; - - sign = spu_sl(spu_rlmask((vector unsigned int)x, -31), 31); - inv_x = _recipf4(x); - inv_x = (vector float)spu_xor((vector unsigned int)inv_x, spu_splats(0x80000000)); - - select = (vector unsigned int)spu_cmpabsgt(x, spu_splats(1.0f)); - bias = (vector float)spu_or(sign, (vector unsigned int)(spu_splats((float)SM_PI_2))); - bias = (vector float)spu_and((vector unsigned int)bias, select); - - x = spu_sel(x, inv_x, select); - - /* Instruction counts can be reduced if the polynomial was - * computed entirely from nested (dependent) fma's. However, - * to reduce the number of pipeline stalls, the polygon is evaluated - * in two halves(hi and lo). - */ - bias = spu_add(bias, x); - x2 = spu_mul(x, x); - x3 = spu_mul(x2, x); - x4 = spu_mul(x2, x2); - x8 = spu_mul(x4, x4); - x9 = spu_mul(x8, x); - hi = spu_madd(spu_splats(0.0028662257f), x2, spu_splats(-0.0161657367f)); - hi = spu_madd(hi, x2, spu_splats(0.0429096138f)); - hi = spu_madd(hi, x2, spu_splats(-0.0752896400f)); - hi = spu_madd(hi, x2, spu_splats(0.1065626393f)); - lo = spu_madd(spu_splats(-0.1420889944f), x2, spu_splats(0.1999355085f)); - lo = spu_madd(lo, x2, spu_splats(-0.3333314528f)); - lo = spu_madd(lo, x3, bias); - - result = spu_madd(hi, x9, lo); - - return (result); -} - -#endif /* _ATANF4_H_ */ -#endif /* __SPU__ */ - - |