| /* |
| (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 _FREXPF_H_ |
| #define _FREXPF_H_ 1 |
| |
| #include <spu_intrinsics.h> |
| #include "headers/vec_literal.h" |
| |
| /* Return the normalized fraction and exponent to the number x. |
| */ |
| static __inline float _frexpf(float x, int *pexp) |
| { |
| vec_int4 exp; |
| vec_uint4 mask; |
| vec_uint4 exp_mask = VEC_SPLAT_U32(0x7F800000); |
| vec_float4 half = VEC_SPLAT_F32(0.5f); |
| vec_float4 in, mant; |
| |
| 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, -23), 0xFF); |
| mask = spu_cmpeq(exp, 0); |
| mant = spu_andc(mant, (vec_float4)mask); |
| |
| /* Zero exponent if zero or denorm input. Otherwise, compute |
| * exponent by removing the bias. |
| */ |
| exp = spu_andc(spu_add(exp, -126), (vec_int4)mask); |
| *pexp = spu_extract(exp, 0); |
| |
| return (spu_extract(mant, 0)); |
| } |
| #endif /* _FREXPF_H_ */ |