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Diffstat (limited to 'newlib/libm/machine/spu/headers/exp2f4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/exp2f4.h | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/newlib/libm/machine/spu/headers/exp2f4.h b/newlib/libm/machine/spu/headers/exp2f4.h deleted file mode 100644 index e9de71be0..000000000 --- a/newlib/libm/machine/spu/headers/exp2f4.h +++ /dev/null @@ -1,134 +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 _EXP2F4_H_ -#define _EXP2F4_H_ 1 - - -#include <spu_intrinsics.h> -#include "simdmath.h" - -/* - * FUNCTION - * vector float _exp2f4(vector float x) - * - * DESCRIPTION - * The _exp2f4 function computes 2 raised to the input vector x. - * Computation is performed by observing the 2^(a+b) = 2^a * 2^b. - * We decompose x into a and b (above) by letting. - * a = ceil(x), b = x - a; - * - * 2^a is easilty computed by placing a into the exponent - * or a floating point number whose mantissa is all zeros. - * - * 2^b is computed using the following polynomial approximation. - * (C. Hastings, Jr, 1955). - * - * __7__ - * \ - * \ - * 2^(-x) = / Ci*x^i - * /____ - * i=1 - * - * for x in the range 0.0 to 1.0 - * - * C0 = 1.0 - * C1 = -0.9999999995 - * C2 = 0.4999999206 - * C3 = -0.1666653019 - * C4 = 0.0416573475 - * C5 = -0.0083013598 - * C6 = 0.0013298820 - * C7 = -0.0001413161 - * - */ -static __inline vector float _exp2f4(vector float x) -{ - vector signed int ix; - vector unsigned int overflow, underflow; - vector float frac, frac2, frac4; - vector float exp_int, exp_frac; - vector float result; - vector float hi, lo; - - vector float bias; - /* Break in the input x into two parts ceil(x), x - ceil(x). - */ - bias = (vector float)(spu_rlmaska((vector signed int)(x), -31)); - bias = (vector float)(spu_andc(spu_splats((unsigned int)0x3F7FFFFF), (vector unsigned int)bias)); - ix = spu_convts(spu_add(x, bias), 0); - frac = spu_sub(spu_convtf(ix, 0), x); - frac = spu_mul(frac, spu_splats((float)SM_LN2)); - - overflow = spu_rlmask(spu_cmpgt(ix, 128), -1); - underflow = spu_cmpgt(ix, -128); - - exp_int = (vector float)spu_and((vector unsigned int)spu_sl(spu_add(ix, 127), 23), underflow); - - /* 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 amd lo). - */ - frac2 = spu_mul(frac, frac); - frac4 = spu_mul(frac2, frac2); - - hi = spu_madd(frac, spu_splats(-0.0001413161f), spu_splats(0.0013298820f)); - hi = spu_madd(frac, hi, spu_splats(-0.0083013598f)); - hi = spu_madd(frac, hi, spu_splats(0.0416573475f)); - lo = spu_madd(frac, spu_splats(-0.1666653019f), spu_splats(0.4999999206f)); - lo = spu_madd(frac, lo, spu_splats(-0.9999999995f)); - lo = spu_madd(frac, lo, spu_splats(1.0f)); - - exp_frac = spu_madd(frac4, hi, lo); - ix = spu_add(ix, spu_rlmask((vector signed int)(exp_frac), -23)); - result = spu_mul(exp_frac, exp_int); - - /* Handle overflow */ - result = spu_or(result, (vector float)overflow); - - return (result); - -} - -#endif /* _EXP2F4_H_ */ -#endif /* __SPU__ */ |