| 1 | /* |
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| 2 | Copyright 2007 |
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| 3 | International Business Machines Corporation, |
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| 4 | Sony Computer Entertainment, Incorporated, |
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| 5 | Toshiba Corporation, |
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| 6 | |
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| 7 | All rights reserved. |
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| 8 | |
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| 9 | Redistribution and use in source and binary forms, with or without |
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| 10 | modification, are permitted provided that the following conditions are met: |
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| 11 | |
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| 12 | * Redistributions of source code must retain the above copyright notice, |
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| 13 | this list of conditions and the following disclaimer. |
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| 14 | * Redistributions in binary form must reproduce the above copyright |
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| 15 | notice, this list of conditions and the following disclaimer in the |
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| 16 | documentation and/or other materials provided with the distribution. |
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| 17 | * Neither the names of the copyright holders nor the names of their |
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| 18 | contributors may be used to endorse or promote products derived from |
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| 19 | this software without specific prior written permission. |
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| 20 | |
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| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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| 22 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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| 23 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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| 24 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
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| 25 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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| 26 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 27 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 28 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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| 29 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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| 30 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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| 31 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 32 | */ |
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| 33 | |
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| 34 | #include <errno.h> |
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| 35 | |
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| 36 | /* |
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| 37 | * dom_chkd_negone_one: "domain check double negative-one and one": |
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| 38 | * |
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| 39 | * Set errno to EDOM if |x| > 1.0. |
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| 40 | * |
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| 41 | * This is for scalar use only, the input is a vector double, but both |
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| 42 | * values in the vector must be the same. |
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| 43 | * |
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| 44 | * We *only* set errno, and do not bother setting the actual return value |
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| 45 | * of any functions to a NAN. That way, we have the same method for double |
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| 46 | * and single precision (there are no float nans for single precision so |
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| 47 | * those can't return a nan). |
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| 48 | * |
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| 49 | * Note that for newlib, errno is/was a function call, so not so obviously |
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| 50 | * we are not branchless here. Unknown if adding a branch (and avoiding a |
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| 51 | * call to __errno) is faster than this current code. |
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| 52 | */ |
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| 53 | |
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| 54 | static __inline void dom_chkd_negone_one (vector double vx) |
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| 55 | { |
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| 56 | vector unsigned long long domain; |
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| 57 | vector signed int verrno; |
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| 58 | vector double ones = { 1.0, 1.0 }; |
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| 59 | vector signed int fail = { EDOM, EDOM, EDOM, EDOM }; |
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| 60 | |
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| 61 | domain = spu_cmpabsgt(vx, ones); |
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| 62 | verrno = spu_splats(errno); |
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| 63 | /* |
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| 64 | * domain is 2 long longs, but they have the same value. Even so, no |
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| 65 | * special code is needed to extract the scalar errno (we have all ones |
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| 66 | * or all zeroes for the preferred scalar slot). |
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| 67 | */ |
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| 68 | errno = spu_extract(spu_sel(verrno, fail, (vector unsigned int) domain), 0); |
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| 69 | } |
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