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jeremybenn |
/*
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(C) Copyright 2001,2006,
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International Business Machines Corporation,
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Sony Computer Entertainment, Incorporated,
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Toshiba Corporation,
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LROUND_H_
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#define _LROUND_H_ 1
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#include <spu_intrinsics.h>
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#include "headers/vec_literal.h"
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/* Round the input to the nearest integer value, rounding halfway cases
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* away from zero. No special handling is performed when values are
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* outside the 32-bit range.
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*/
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static __inline long int _lround(double x)
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{
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int shift;
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vec_int4 exp;
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vec_uint4 mant, sign, mask, addend;
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vec_double2 in;
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in = spu_promote(x, 0);
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/* Determine how many bits to shift the mantissa to correctly
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* align it into long long element 0.
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*/
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exp = spu_and(spu_rlmask((vec_int4)in, -20), 0x7FF);
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exp = spu_add(exp, -979);
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shift = spu_extract(exp, 0);
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mask = spu_cmpgt(exp, 0);
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/* Algn mantissa bits
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*/
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mant = spu_sel(spu_rlmaskqwbyte((vec_uint4)in, -8), VEC_SPLAT_U32(0x00100000),
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VEC_LITERAL(vec_uint4, 0,0,0xFFF00000,0));
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mant = spu_slqwbytebc(spu_slqw(mant, shift), shift);
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/* Perform round by adding 1 if the fraction bits are
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* greater than or equal to .5
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*/
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addend = spu_and(spu_rlqw(mant, 1), 1);
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mant = spu_and(spu_add(mant, addend), mask);
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/* Compute the two's complement of the mantissa if the
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* input is negative.
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*/
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sign = (vec_uint4)spu_rlmaska((vec_int4)in, -31);
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mant = spu_sub(spu_xor(mant, sign), sign);
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return ((long int)spu_extract(mant, 0));
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}
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#endif /* _LROUND_H_ */
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