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Diffstat (limited to 'source/luametatex/source/libraries/softposit/source/pX1_sub.c')
| -rw-r--r-- | source/luametatex/source/libraries/softposit/source/pX1_sub.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/source/luametatex/source/libraries/softposit/source/pX1_sub.c b/source/luametatex/source/libraries/softposit/source/pX1_sub.c new file mode 100644 index 000000000..6a6c3ac95 --- /dev/null +++ b/source/luametatex/source/libraries/softposit/source/pX1_sub.c @@ -0,0 +1,88 @@ + +/*============================================================================ + +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" + +posit_1_t pX1_sub( posit_1_t a, posit_1_t b, int x) { + union ui32_pX1 uA, uB, uZ; + uint_fast32_t uiA, uiB; + + if (x<2 || x>32){ + uZ.ui = 0x80000000; + return uZ.p; + } + + uA.p = a; + uiA = uA.ui; + uB.p = b; + uiB = uB.ui; + +#ifdef SOFTPOSIT_EXACT + uZ.ui.exact = (uiA.ui.exact & uiB.ui.exact); +#endif + + //infinity + if ( uiA==0x80000000 || uiB==0x80000000 ){ +#ifdef SOFTPOSIT_EXACT + uZ.ui.v = 0x80000000; + uZ.ui.exact = 0; +#else + uZ.ui = 0x80000000; +#endif + return uZ.p; + } + //Zero + else if ( uiA==0 || uiB==0 ){ +#ifdef SOFTPOSIT_EXACT + uZ.ui.v = (uiA | -uiB); + uZ.ui.exact = 0; +#else + uZ.ui = (uiA | -uiB); +#endif + return uZ.p; + } + + //different signs + if ((uiA^uiB)>>31) + return softposit_addMagsPX1(uiA, (-uiB & 0xFFFFFFFF), x); + else + return softposit_subMagsPX1(uiA, (-uiB & 0xFFFFFFFF), x); + + + +} + |