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Diffstat (limited to 'newlib/libm/machine/spu/headers/expf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/expf4.h | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/newlib/libm/machine/spu/headers/expf4.h b/newlib/libm/machine/spu/headers/expf4.h deleted file mode 100644 index 7dac9217c..000000000 --- a/newlib/libm/machine/spu/headers/expf4.h +++ /dev/null @@ -1,112 +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 _EXPF4_H_ -#define _EXPF4_H_ 1 - - -#include "floorf4.h" -#include "ldexpf4.h" - -/* - * FUNCTION - * vector float _expf4(vector float x) - * - * DESCRIPTION - * The _expf4 function computes e raised to the input x for - * each of the element of the float vector. - * - */ -static __inline vector float _expf4(vector float x) -{ - - // log2(e) - vec_float4 log2e = spu_splats(1.4426950408889634074f); - - // Extra precision for the ln2 multiply - vec_float4 ln2_hi = spu_splats(0.693359375f); - vec_float4 ln2_lo = spu_splats(-2.12194440E-4f); - - // Coefficents for the Taylor series - vec_float4 f02 = spu_splats(5.0000000000000000E-1f); // 1/2! - vec_float4 f03 = spu_splats(1.6666666666666667E-1f); // 1/3! - vec_float4 f04 = spu_splats(4.1666666666666667E-2f); // 1/4! - vec_float4 f05 = spu_splats(8.3333333333333333E-3f); // 1/5! - vec_float4 f06 = spu_splats(1.3888888888888889E-3f); // 1/6! - vec_float4 f07 = spu_splats(1.9841269841269841E-4f); // 1/7! - - // Range reduce input, so that: - // e^x = e^z * 2^n - // e^x = e^z * e^(n * ln(2)) - // e^x = e^(z + (n * ln(2))) - - vec_int4 n; // exponent of reduction - vec_float4 q; // range reduced result - - vec_float4 z; - vec_float4 r; - - z = spu_madd(x,log2e,spu_splats(0.5f)); - z = _floorf4(z); - r = spu_nmsub(z,ln2_hi,x); - r = spu_nmsub(z,ln2_lo,r); - n = spu_convts(z,0); - z = spu_mul(r,r); - - // Use Horner's method on the Taylor series - q = spu_madd(r,f07,f06); - q = spu_madd(q,r,f05); - q = spu_madd(q,r,f04); - q = spu_madd(q,r,f03); - q = spu_madd(q,r,f02); - q = spu_madd(q,z,r); - q = spu_add(q,spu_splats(1.0f)); - - // Adjust the result by the range reduction - r = _ldexpf4( q, n ); - - return(r); - -} - -#endif /* _EXPF4_H_ */ -#endif /* __SPU__ */ - |