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Diffstat (limited to 'newlib/libm/machine/spu/headers/powf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/powf4.h | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/newlib/libm/machine/spu/headers/powf4.h b/newlib/libm/machine/spu/headers/powf4.h deleted file mode 100644 index 4fd2a229b..000000000 --- a/newlib/libm/machine/spu/headers/powf4.h +++ /dev/null @@ -1,120 +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 _POWF4_H_ -#define _POWF4_H_ 1 - -#include <spu_intrinsics.h> -#include <vec_types.h> - -#include "exp2f4.h" -#include "log2f4.h" - -/* - * FUNCTION - * vector float _powf4(vector float x, vector float y) - * - * DESCRIPTION - * The _powf4 function computes x raised to the power y for the set of - * vectors. The powf4 function is computed as by decomposing - * the problem into: - * - * x^y = 2^(y*log2(x)) - * - */ -static __inline vector float _powf4(vector float x, vector float y) -{ - vec_uint4 y_exp; - vec_uint4 y_mantissa; - vec_uint4 mant_shift; - vec_uint4 y_is_int; - vec_uint4 y_is_odd; - vec_uint4 x_sign_bit; - vec_uint4 zero = (vec_uint4)spu_splats(0); - vec_uint4 bit0 = (vec_uint4)spu_splats(0x80000000); - vec_int4 error = spu_splats(-1); - vec_float4 out; - - y_exp = spu_and(spu_rlmask((vec_uint4)y, -23), 0x000000FF); - - /* Need the implied bit in the mantissa to catch - * y = 1 case later - */ - y_mantissa = spu_or(spu_sl((vec_uint4)y, (unsigned int)8), bit0); - - x_sign_bit = spu_and((vec_uint4)x, bit0); - - /* We are going to shift the mantissa over enough to - * determine if we have an integer. - */ - mant_shift = spu_add(y_exp, -127); - - - /* Leave the lowest-order integer bit of mantissa on the - * high end so we can see if the integer is odd. - */ - y_mantissa = spu_sl(y_mantissa, mant_shift); - - y_is_int = spu_cmpeq(spu_andc(y_mantissa, bit0), 0); - y_is_int = spu_and(y_is_int, spu_cmpgt(y_exp, 126)); - - y_is_odd = spu_and(spu_cmpeq(y_mantissa, bit0), y_is_int); - - out = _exp2f4(spu_mul(y, _log2f4(spu_andc(x, (vec_float4)bit0)))); - - /* x < 0 is only ok when y integer - */ - out = spu_sel(out, (vec_float4)error, - spu_andc(spu_cmpeq(x_sign_bit, bit0), y_is_int)); - - /* Preserve the sign of x if y is an odd integer - */ - out = spu_sel(out, spu_or(out, (vec_float4)x_sign_bit), y_is_odd); - - /* x = anything, y = +/- 0, returns 1 - */ - out = spu_sel(out, spu_splats(1.0f), spu_cmpabseq(y, (vec_float4)zero)); - - return(out); -} - -#endif /* _POWF4_H_ */ -#endif /* __SPU__ */ |