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Diffstat (limited to 'newlib/libm/machine/spu/headers/sqrtf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/sqrtf4.h | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/newlib/libm/machine/spu/headers/sqrtf4.h b/newlib/libm/machine/spu/headers/sqrtf4.h deleted file mode 100644 index 4565ab406..000000000 --- a/newlib/libm/machine/spu/headers/sqrtf4.h +++ /dev/null @@ -1,116 +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 _SQRTF4_H_ -#define _SQRTF4_H_ 1 - -#include <spu_intrinsics.h> - -/* - * FUNCTION - * vector float _sqrtf4(vector float in) - * - * DESCRIPTION - * The _sqrtf4 function computes the square root of the vector input "in" - *and returns the result. - * - */ -static __inline vector float _sqrtf4(vector float in) -{ - vec_uint4 exp, valid; - vec_uint4 mask = spu_splats((unsigned int)0xFF000000); - vec_uint4 half = spu_splats((unsigned int)0x00800000); - vec_float4 one = spu_splats(1.0f); - vec_float4 three = spu_splats(3.0f); - vec_float4 x, y0, y1, y1_n1, y1_p1, y1_p2, y1_p3; - vec_float4 mant, err, err_p1, err_p2, err_p3; - vec_float4 out; - - /* Compute the mantissa of the result seperately from - * the exponent to assure complete accuracy over the allowable - * input range. The mantissa is computed for inputs in the - * range [0.5, 2.0). - */ - x = spu_sel(in, one, mask); - y0 = spu_rsqrte(x); - - /* Perform one iteration of the Newton-Raphsom method in single precision - * arithmetic. - */ - y1 = spu_mul(spu_nmsub(x, spu_mul(y0, y0), three), - spu_mul(y0, (vec_float4)(spu_sub((vec_uint4)(x), half)))); - - /* Correct the result for possible error. The range of error is -3 to +1. - * Identify the extent of the error and correct for it. - */ - y1_p3 = (vec_float4)spu_add((vec_uint4)(y1), 3); - y1_p2 = (vec_float4)spu_add((vec_uint4)(y1), 2); - y1_p1 = (vec_float4)spu_add((vec_uint4)(y1), 1); - y1_n1 = (vec_float4)spu_add((vec_uint4)(y1), -1); - - err = spu_nmsub(y1, y1, x); - err_p1 = spu_nmsub(y1_p1, y1_p1, x); - err_p2 = spu_nmsub(y1_p2, y1_p2, x); - err_p3 = spu_nmsub(y1_p3, y1_p3, x); - - mant = spu_sel(y1_n1, y1, spu_cmpgt((vec_int4)(err), -1)); - mant = spu_sel(mant, y1_p1, spu_cmpgt((vec_int4)(err_p1), -1)); - mant = spu_sel(mant, y1_p2, spu_cmpgt((vec_int4)(err_p2), -1)); - mant = spu_sel(mant, y1_p3, spu_cmpgt((vec_int4)(err_p3), -1)); - - /* Compute the expected exponent. If the exponent is zero or the input is - * negative, then set the result to zero. - */ - exp = spu_rlmask(spu_add((vec_uint4)(in), (vec_uint4)(one)), -1); - - valid = spu_cmpgt(spu_and((vec_int4)(in), (vec_int4)(mask)), 0); - - /* Merge the computed exponent and mantissa. - */ - out = spu_and(spu_sel(mant, (vec_float4)(exp), spu_splats(0xFF800000)), (vec_float4)(valid)); - - - return (out); - -} - -#endif /* _SQRTF4_H_ */ -#endif /* __SPU__ */ |