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Diffstat (limited to 'newlib/libm/machine/spu/headers/tand2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/tand2.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/tand2.h b/newlib/libm/machine/spu/headers/tand2.h new file mode 100644 index 000000000..70b35a3ee --- /dev/null +++ b/newlib/libm/machine/spu/headers/tand2.h @@ -0,0 +1,117 @@ +/* -------------------------------------------------------------- */ +/* (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 _TAND2_H_ +#define _TAND2_H_ 1 + +#include <spu_intrinsics.h> + +#include "cos_sin.h" +#include "divd2.h" + +/* + * FUNCTION + * vector double _tand2(vector double angle) + * + * DESCRIPTION + * The _tand2 function computes the tangent of a vector of "angle"s + * (expressed in radians) to an accuracy of double precision floating + * point. + * + */ +static __inline vector double _tand2(vector double angle) +{ + vec_int4 octant; + vec_ullong2 select; + vec_double2 cos, sin; + vec_double2 num, den; + vec_double2 toggle_sign, answer; + + /* Range reduce the input angle x into the range -PI/4 to PI/4 + * by performing simple modulus. + */ + MOD_PI_OVER_FOUR(angle, octant); + + /* Compute the cosine and sine of the range reduced input. + */ + COMPUTE_COS_SIN(angle, cos, sin); + + /* For each SIMD element, select the numerator, denominator, and sign + * correction depending upon the octant of the original angle. + * + * octants angles numerator denominator sign toggle + * ------- ------------ --------- ----------- ----------- + * 0 0 to 45 sin cos no + * 1,2 45 to 135 cos sin no,yes + * 3,4 135 to 225 sin cos yes,no + * 5,6 225 to 315 cos sin no,yes + * 7 315 to 360 sin cos yes + */ + octant = spu_shuffle(octant, octant, ((vec_uchar16) { + 0,1, 2, 3, 0,1, 2, 3, + 8,9,10,11, 8,9,10,11 })); + + toggle_sign = spu_and((vec_double2)spu_sl(octant, 30), + (vec_double2) spu_splats(0x8000000000000000ULL)); + + select = (vec_ullong2)spu_cmpeq(spu_and(octant, 2), 0); + num = spu_sel(cos, sin, select); + den = spu_sel(sin, cos, select); + + answer = spu_xor(_divd2(num, den), toggle_sign); + + return (answer); +} + +#endif /* _TAND2_H_ */ +#endif /* __SPU__ */ |