68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/* divi4 -
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Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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All rights reserved.
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Redistribution and use in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, 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 name of the Sony Computer Entertainment Inc nor the names
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of its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ___SIMD_MATH_DIVI4_H___
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#define ___SIMD_MATH_DIVI4_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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#include <simdmath/divu4.h>
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// divi4 - for each of four integer slots, compute quotient and remainder of numer/denom
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// and store in divi4_t struct. Divide by zero produces quotient = 0, remainder = numerator.
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static inline divi4_t
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_divi4 (vector signed int numer, vector signed int denom)
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{
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divu4_t resAbs;
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divi4_t res;
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vec_uint4 numerPos, denomPos, quotNeg;
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vec_uint4 numerAbs, denomAbs;
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// Determine whether result needs sign change
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numerPos = spu_cmpgt( numer, -1 );
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denomPos = spu_cmpgt( denom, -1 );
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quotNeg = spu_xor( numerPos, denomPos );
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// Use absolute values of numerator, denominator
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numerAbs = (vec_uint4)spu_sel( spu_sub( 0, numer ), numer, numerPos );
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denomAbs = (vec_uint4)spu_sel( spu_sub( 0, denom ), denom, denomPos );
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resAbs = _divu4(numerAbs, denomAbs);
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res.quot = spu_sel( (vec_int4)resAbs.quot, spu_sub( 0, (vec_int4)resAbs.quot ), quotNeg );
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res.rem = spu_sel( spu_sub( 0, (vec_int4)resAbs.rem ), (vec_int4)resAbs.rem, numerPos );
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return res;
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}
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#endif
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