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Diffstat (limited to 'newlib/libm/machine/spu/headers/recipf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/recipf4.h | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/newlib/libm/machine/spu/headers/recipf4.h b/newlib/libm/machine/spu/headers/recipf4.h deleted file mode 100644 index d313c022e..000000000 --- a/newlib/libm/machine/spu/headers/recipf4.h +++ /dev/null @@ -1,142 +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 _RECIPF4_H_ -#define _RECIPF4_H_ 1 - -#include <spu_intrinsics.h> - -/* - * FUNCTION - * vector float _recipf4(vector float value) - * - * DESCRIPTION - * The _recipf4 function inverts the vector "value" and returns the - * result. - * - */ -static __inline vector float _recipf4(vector float a) -{ - /* This function has been designed to provide a - * full function operation that presisely computes - * the reciprocal for the entire range of extended - * single precision input <a>. This includes: - * - * 1) Computing the reciprocal to full single precision - * floating point accuracy. - * 2) Round the result consistently with the rounding - * mode of the processor - truncated toward zero. - * 3) Underflow and overflow results are clamped to - * Smin and Smax and flagged with the appropriate - * UNF or OVF exception in the FPSCR. - * 4) Divide By Zero (DBZ) exception is produced when - * the input <a> has a zero exponent. A reciprocal - * of correctly signed Smax is produced. - * 5) Resulting denorm reciprocal will be coerced to +0. - * 6) If a non-compliant IEEE result is produced, the - * a DIFF exception is generated. - */ - vector float err, x0, x1; - vector float mult; - vector float mant_a; - vector float one = spu_splats(1.0f); - vector unsigned int exp, exp_a; - vector unsigned int exp_mask = (vec_uint4)spu_splats(0x7F800000); - - /* If a has a zero exponent, then set the divide by zero - * (DBZ) exception flag. The estimate result is discarded. - */ - (void)si_frest((qword)(a)); - - /* For computing the reciprocal, force the value - * into the range (1.0 <= 0 < 2.0). - */ - mant_a = spu_sel(a, one, exp_mask); - - /* Compute the reciprocal using the reciprocal estimate - * followed by one iteration of the Newton-Raphson. - * Due to truncation error, the quotient result may be low - * by 1 ulp (unit of least position). Conditionally add one - * if the estimate is too small. - */ - x0 = spu_re(mant_a); - x0 = spu_madd(spu_nmsub(mant_a, x0, one), x0, x0); - - x1 = (vector float)(spu_add((vector unsigned int)(x0), 1)); - err = spu_nmsub(mant_a, x1, one); - - x1 = spu_sel(x0, x1, spu_cmpgt((vector signed int)(err), -1)); - - /* Compute the reciprocal's expected exponent. If the exponent - * is out of range, then force the resulting exponent to 0. - * (127 with the bias). We correct for the out of range - * values by computing a multiplier (mult) that will force the - * result to the correct out of range value and set the - * correct exception flag (UNF, OVF, or neither). The multiplier - * is also conditioned to generate correctly signed Smax if the - * inoput <a> is a denorm or zero. - */ - exp_a = spu_and((vector unsigned int)a, exp_mask); - exp = spu_add(spu_sub(spu_splats((unsigned int)0x7F000000), exp_a), spu_cmpabsgt(mant_a, one)); - - /* The default multiplier is 1.0. If an underflow is detected (ie, - * either the dividend <a> is a denorm/zero, or the computed exponent is - * less than or equal to a biased 0), force the multiplier to 0.0. - */ - mult = spu_and(one, (vector float)spu_cmpgt((vector signed int)(exp), 0)); - - /* Force the multiplier to positive Smax (0x7FFFFFFF) and the biased exponent - * to 127, if the divisor is denorm/zero or the computed biased exponent is - * greater than 255. - */ - mult = spu_or(mult, (vector float)spu_rlmask(spu_cmpeq(exp_a, 0), -1)); - - /* Insert the exponent into the result and perform the - * final multiplication. - */ - x1 = spu_sel(x1, (vector float)exp, exp_mask); - x1 = spu_mul(x1, mult); - - return (x1); -} - -#endif /* _RECIPF4_H_ */ -#endif /* __SPU__ */ |