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Diffstat (limited to 'source/luametatex/source/libraries/softposit/source/p8_sqrt.c')
| -rw-r--r-- | source/luametatex/source/libraries/softposit/source/p8_sqrt.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/source/luametatex/source/libraries/softposit/source/p8_sqrt.c b/source/luametatex/source/libraries/softposit/source/p8_sqrt.c new file mode 100644 index 000000000..32a289b8d --- /dev/null +++ b/source/luametatex/source/libraries/softposit/source/p8_sqrt.c @@ -0,0 +1,63 @@ + +/*============================================================================ + +This C source file is part of the SoftPosit Posit Arithmetic Package +by S. H. Leong (Cerlane). + +Copyright 2017 A*STAR. All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include "platform.h" +#include "internals.h" + +posit8_t p8_sqrt( posit8_t pA ) { + union ui8_p8 uA; + uint_fast8_t uiA; + + static const uint8_t p8Sqrt [] = + {0, 8, 11, 14, 16, 18, 20, 21, 23, 24, 25, 27, 28, 29, 30, 31, 32, + 33, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42, 42, 43, 44, 45, 45, 46, + 47, 47, 48, 49, 49, 50, 51, 51, 52, 52, 53, 54, 54, 55, 55, 56, 57, + 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63, 64, 64, 65, 65, + 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 70, 71, 71, 72, 72, 72, 73, + 73, 74, 74, 74, 75, 75, 75, 76, 76, 77, 77, 77, 79, 80, 81, 83, 84, + 85, 86, 87, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 100, + 101, 102, 103, 105, 108, 110, 112, 114, 115, 120}; + uA.p = pA; + uiA = uA.ui; + + if (uiA>=0x80){ + uA.ui = 0x80; + return uA.p; + } + uA.ui = p8Sqrt[uiA]; + + return uA.p; +} + |