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https://github.com/openhwgroup/cvw
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100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
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/*============================================================================
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This C source file is part of TestFloat, Release 3e, a package of programs for
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testing the correctness of floating-point arithmetic complying with the IEEE
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Standard for Floating-Point, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
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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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1. 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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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING 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 <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "uint128.h"
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struct uint128 shortShiftLeft128( struct uint128 a, int count )
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{
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struct uint128 z;
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z.v64 = a.v64<<count | a.v0>>(-count & 63);
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z.v0 = a.v0<<count;
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return z;
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}
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struct uint128 shortShiftRight128( struct uint128 a, int count )
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{
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struct uint128 z;
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z.v64 = a.v64>>count;
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z.v0 = a.v64<<(-count & 63) | a.v0>>count;
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return z;
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}
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struct uint128 shortShiftRightJam128( struct uint128 a, int count )
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{
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int negCount;
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struct uint128 z;
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negCount = -count;
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z.v64 = a.v64>>count;
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z.v0 =
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a.v64<<(negCount & 63) | a.v0>>count
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| ((uint64_t) (a.v0<<(negCount & 63)) != 0);
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return z;
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}
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struct uint128 neg128( struct uint128 a )
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{
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if ( a.v0 ) {
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a.v64 = ~a.v64;
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a.v0 = -a.v0;
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} else {
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a.v64 = -a.v64;
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}
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return a;
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}
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struct uint128 add128( struct uint128 a, struct uint128 b )
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{
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struct uint128 z;
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z.v0 = a.v0 + b.v0;
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z.v64 = a.v64 + b.v64 + (z.v0 < a.v0);
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return z;
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}
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