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Diffstat (limited to 'newlib/libm/machine/spu/headers/ldexpd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/ldexpd2.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/ldexpd2.h b/newlib/libm/machine/spu/headers/ldexpd2.h new file mode 100644 index 000000000..f00afceb2 --- /dev/null +++ b/newlib/libm/machine/spu/headers/ldexpd2.h @@ -0,0 +1,114 @@ +/* -------------------------------------------------------------- */ +/* (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 _LDEXPD2_H_ +#define _LDEXPD2_H_ 1 + +#include <spu_intrinsics.h> + +/* + * FUNCTION + * vector double _ldexpd2(vector double x, vector signed long long exp) + * + * DESCRIPTION + * The _ldexpd2 function Computes x * 2^exp for each of the two elements + * of x using the corresponding elements of exp. + * + */ +static __inline vector double _ldexpd2(vector double x, vector signed long long llexp) +{ + vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80, + 12,13,14,15, 0x80,0x80,0x80,0x80 }); + vec_uchar16 dup_even = ((vec_uchar16) { 0,1,2,3, 0,1,2,3, + 8,9,10,11, 8,9,10,11}); + vec_int4 exp; + vec_uint4 exphi; + vec_int4 e1, e2; + vec_int4 min = spu_splats(-2044); + vec_int4 max = spu_splats(2046); + vec_uint4 cmp_min, cmp_max; + vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 }; + vec_double2 f1, f2; + vec_double2 out; + + exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even); + + exphi = (vec_uint4)spu_shuffle(llexp, llexp, dup_even); + + /* Clamp the specified exponent to the range -2044 to 2046. + */ + + cmp_min = spu_cmpgt(exp, min); + cmp_max = spu_cmpgt(exp, max); + exp = spu_sel(min, exp, cmp_min); + exp = spu_sel(exp, max, cmp_max); + + /* Generate the factors f1 = 2^e1 and f2 = 2^e2 + */ + e1 = spu_rlmaska(exp, -1); + e2 = spu_sub(exp, e1); + + f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift); + f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift); + + /* Compute the product x * 2^e1 * 2^e2 + */ + out = spu_mul(spu_mul(x, f1), f2); + + return (out); +} + +#endif /* _LDEXPD2_H_ */ +#endif /* __SPU__ */ + |