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Diffstat (limited to 'newlib/libm/machine/spu/headers/powd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/powd2.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/powd2.h b/newlib/libm/machine/spu/headers/powd2.h new file mode 100644 index 000000000..98234a620 --- /dev/null +++ b/newlib/libm/machine/spu/headers/powd2.h @@ -0,0 +1,133 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* 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. */ +/* 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 _POWD2_H_ +#define _POWD2_H_ 1 + +#include "exp2d2.h" +#include "log2d2.h" + +/* + * FUNCTION + * vector double _powd2(vector double x, vector double y) + * + * DESCRIPTION + * The _powd2 function computes x raised to the power y for the set of + * vectors. The powd2 function is computed as by decomposing + * the problem into: + * + * x^y = 2^(y*log2(x)) + * + * + */ +static __inline vector double _powd2(vector double x, vector double y) +{ + vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11 }; + vec_int4 exp, shift; + vec_uint4 sign = (vec_uint4) { 0x80000000, 0, 0x80000000, 0 }; + vec_uint4 or_mask, and_mask, evenmask, intmask; + vec_double2 in_hi; + vector double signmask = spu_splats(-0.0); + vector signed int error = spu_splats(-1); + vector double zero = spu_splats(0.0); + vector unsigned int y_is_int, y_is_odd, y_is_even; + vector unsigned int x_is_neg; + vector double xabs, xsign; + vector double out; + + + xsign = spu_and(x, signmask); + xabs = spu_andc(x, signmask); + x_is_neg = (vec_uint4)spu_cmpgt(zero, x); + + + /* First we solve assuming x was non-negative */ + out = _exp2d2(spu_mul(y, _log2d2(xabs))); + + in_hi = spu_shuffle(y, y, splat_hi); + exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF); + + /* Determine if y is an integer */ + shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 }), exp); + or_mask = spu_andc(spu_cmpgt(shift, 0), sign); + and_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 }), shift); + intmask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask); + y_is_int = (vec_uint4)spu_cmpeq(y, spu_andc(y, (vec_double2)(intmask))); + + /* Determine if y is an even integer */ + shift = spu_sub(((vec_int4) { 1024, 1044, 1024, 1044 }), exp); + or_mask = spu_andc(spu_cmpgt(shift, 0), sign); + and_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 }), shift); + evenmask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask); + y_is_even = (vec_uint4)spu_cmpeq(y, spu_andc(y, (vec_double2)(evenmask))); + + y_is_odd = spu_andc(y_is_int, y_is_even); + + + /* Special Cases + */ + + /* x < 0 is only ok when y integer */ + out = spu_sel(out, (vec_double2)error, (vec_ullong2)spu_andc(x_is_neg, y_is_int)); + + /* Preserve the sign of x if y is an odd integer */ + out = spu_sel(out, spu_or(out, xsign), (vec_ullong2)y_is_odd); + + /* x = anything, y = +/- 0, returns 1 */ + out = spu_sel(out, spu_splats(1.0), spu_cmpabseq(y, zero)); + + return(out); +} + +#endif /* _POWD2_H_ */ +#endif /* __SPU__ */ |