115 lines
5.3 KiB
C
115 lines
5.3 KiB
C
/* -------------------------------------------------------------- */
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/* (C)Copyright 2006,2007, */
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/* International Business Machines Corporation */
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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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/* 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 _ISNAND2_H_
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#define _ISNAND2_H_ 1
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#include <spu_intrinsics.h>
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/*
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* FUNCTION
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* vector unsigned long long _isnand2(vector double x)
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*
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* DESCRIPTION
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* The _isnand2 function returns a vector in which each element indicates
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* if the corresponding element of x is not a number. (NaN)
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*
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* RETURNS
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* The function _isnand2 returns an unsigned long long vector in which
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* each element is defined as:
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*
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* - ULLONG_MAX if the element of x is NaN
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* - 0 otherwise
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*
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*/
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static __inline vector unsigned long long _isnand2(vector double x)
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{
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#ifndef __SPU_EDP__
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vec_uint4 sign_mask = (vec_uint4) { 0x7FFFFFFF, 0xFFFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF };
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vec_uint4 test_mask = (vec_uint4) { 0x7FF00000, 0x00000000, 0x7FF00000, 0x00000000 };
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vec_uchar16 hi_promote = (vec_uchar16) { 0, 1, 2, 3, 0, 1, 2, 3, 8, 9, 10, 11, 8, 9, 10, 11 };
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// Remove the sign bits
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vec_uint4 signless = spu_and((vec_uint4)x,sign_mask);
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// Check if the high word is equal to the max_exp
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vec_uint4 x2 = spu_cmpeq(signless,test_mask);
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// This checks two things:
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// 1) If the high word is greater than max_exp (indicates a NaN)
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// 2) If the low word is non-zero (indicates a NaN in conjunction with an
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// exp equal to max_exp)
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vec_uint4 x1 = spu_cmpgt(signless,test_mask);
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// rotate the low word test of x1 into the high word slot, then and it
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// with the high word of x2 (checking for #2 above)
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vec_uint4 exp_and_lw = spu_and(spu_rlqwbyte(x1,4),x2);
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// All the goodies are in the high words, so if the high word of either x1
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// or exp_and_lw is set, then we have a NaN, so we "or" them together
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vec_uint4 result = spu_or(x1,exp_and_lw);
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// And then promote the resulting high word to 64 bit length
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result = spu_shuffle(result,result,hi_promote);
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return (vec_ullong2) result;
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#else
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return spu_testsv(x, SPU_SV_NAN);
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#endif /* __SPU_EDP__ */
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}
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#endif // _ISNAND2_H_
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#endif /* __SPU__ */
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