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Diffstat (limited to 'newlib/libm/machine/spu/headers/frexp.h')
-rw-r--r-- | newlib/libm/machine/spu/headers/frexp.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/frexp.h b/newlib/libm/machine/spu/headers/frexp.h new file mode 100644 index 000000000..8b525c76e --- /dev/null +++ b/newlib/libm/machine/spu/headers/frexp.h @@ -0,0 +1,74 @@ +/* + (C) Copyright 2001,2006, + 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 names of the copyright holders nor the names of their + 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. +*/ +#ifndef _FREXP_H_ +#define _FREXP_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +/* Return the normalized fraction and exponent to the number x. + * Double precision denorms treated as zero and return a 0 + * fraction and 0 exponent. The results are undefined for infinities + * and NaNs (double precision only). + */ +static __inline double _frexp(double x, int *pexp) +{ + vec_int4 exp; + vec_uint4 denorm, mask; + vec_double2 in, mant; + vec_double2 half = VEC_SPLAT_F64(0.5); + vec_ullong2 exp_mask = VEC_SPLAT_U64(0x7FF0000000000000ULL); + + in = spu_promote(x, 0); + + /* Normalize the mantissa (fraction part). + */ + mant = spu_sel(in, half, exp_mask); + + /* Zero the mantissa if the input is a denorm or zero + */ + exp = spu_and(spu_rlmask((vec_int4)in, -20), 0x7FF); + denorm = spu_cmpeq(exp, 0); + mask = spu_shuffle(denorm, denorm, VEC_SPLAT_U8(0)); + mant = spu_andc(mant, (vec_double2)mask); + + /* Zero exponent if zero or denorm input. Otherwise, compute + * exponent by removing the bias. + */ + exp = spu_andc(spu_add(exp, -1022), (vec_int4)mask); + + *pexp = spu_extract(exp, 0); + + return (spu_extract(mant, 0)); +} +#endif /* _FREXPF_H_ */ |