80 lines
3.7 KiB
C
80 lines
3.7 KiB
C
/* -------------------------------------------------------------- */
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/* (C)Copyright 2001,2008, */
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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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/* */
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/* All Rights Reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the */
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/* following conditions are met: */
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/* */
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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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/* */
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/* - Redistributions in binary form must reproduce the above */
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/* copyright notice, this list of conditions and the following */
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/* disclaimer in the documentation and/or other materials */
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/* provided with the distribution. */
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/* */
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/* - Neither the name of IBM Corporation nor the names of its */
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/* contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written */
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/* permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
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/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
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/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
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/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
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/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
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/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
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/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
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/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* -------------------------------------------------------------- */
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/* PROLOG END TAG zYx */
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#ifdef __SPU__
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#ifndef _TRUNCF4_H_
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#define _TRUNCF4_H_ 1
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#include <spu_intrinsics.h>
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/*
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* FUNCTION
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* vector float _truncf4(vector float x)
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*
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* DESCRIPTION
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* The _truncf4 function truncates the elements of the input vector
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* downwards (towards zero) to the nearest integer.
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*
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*/
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static __inline vector float _truncf4(vector float x)
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{
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vec_int4 exp;
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vec_uint4 or_mask, and_mask, mask;
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vec_float4 out;
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// Construct a mask to remove the fraction bits. The mask
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// depends on the exponent of the floating point
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// input value.
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exp = spu_sub(127, spu_and(spu_rlmask((vec_int4) x, -23), 0xFF));
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// Be sure to always preserve the sign bit
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or_mask = spu_rlmask(spu_cmpgt(exp, 0),-1);
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and_mask = spu_rlmask(spu_splats((unsigned int)0x7FFFFF), exp);
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mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask);
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// Apply the mask and return the result.
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out = spu_andc(x, (vec_float4) (mask));
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return (out);
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}
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#endif /* _TRUNCF4_H_ */
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#endif /* __SPU__ */
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