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Diffstat (limited to 'source/luametatex/source/libraries/softposit/source/p16_add.c')
-rw-r--r-- | source/luametatex/source/libraries/softposit/source/p16_add.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/source/luametatex/source/libraries/softposit/source/p16_add.c b/source/luametatex/source/libraries/softposit/source/p16_add.c new file mode 100644 index 000000000..07b12bca3 --- /dev/null +++ b/source/luametatex/source/libraries/softposit/source/p16_add.c @@ -0,0 +1,75 @@ + +/*============================================================================ + +This C source file is part of the SoftPosit Posit Arithmetic Package +by S. H. Leong (Cerlane). + +Copyright 2017, 2018 A*STAR. All rights reserved. + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of +California. 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" + +posit16_t p16_add( posit16_t a, posit16_t b ){ + union ui16_p16 uA, uB; + uint_fast16_t uiA, uiB; + union ui16_p16 uZ; + + uA.p = a; + uiA = uA.ui; + uB.p = b; + uiB = uB.ui; + + + //Zero or infinity + if (uiA==0 || uiB==0){ // Not required but put here for speed + uZ.ui = uiA | uiB; + return uZ.p; + } + else if ( uiA==0x8000 || uiB==0x8000 ){ + uZ.ui = 0x8000; + return uZ.p; + } + + //different signs + if ((uiA^uiB)>>15) + return softposit_subMagsP16(uiA, uiB); + else + return softposit_addMagsP16(uiA, uiB); + + + +} + |