70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
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/*
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Copyright 2007
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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
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this 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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#include <errno.h>
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/*
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* dom_chkd_negone_one: "domain check double negative-one and one":
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*
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* Set errno to EDOM if |x| > 1.0.
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*
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* This is for scalar use only, the input is a vector double, but both
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* values in the vector must be the same.
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*
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* We *only* set errno, and do not bother setting the actual return value
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* of any functions to a NAN. That way, we have the same method for double
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* and single precision (there are no float nans for single precision so
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* those can't return a nan).
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*
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* Note that for newlib, errno is/was a function call, so not so obviously
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* we are not branchless here. Unknown if adding a branch (and avoiding a
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* call to __errno) is faster than this current code.
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*/
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static __inline void dom_chkd_negone_one (vector double vx)
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{
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vector unsigned long long domain;
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vector signed int verrno;
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vector double ones = { 1.0, 1.0 };
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vector signed int fail = { EDOM, EDOM, EDOM, EDOM };
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domain = spu_cmpabsgt(vx, ones);
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verrno = spu_splats(errno);
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/*
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* domain is 2 long longs, but they have the same value. Even so, no
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* special code is needed to extract the scalar errno (we have all ones
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* or all zeroes for the preferred scalar slot).
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*/
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errno = spu_extract(spu_sel(verrno, fail, (vector unsigned int) domain), 0);
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}
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