source/uint128.h

/*============================================================================

This C header file is part of TestFloat, Release 3d, a package of programs for
testing the correctness of floating-point arithmetic complying with the IEEE
Standard for Floating-Point, by John R. Hauser.

Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
California.  All rights reserved.

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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,
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 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
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=============================================================================*/

#ifndef uint128_h
#define uint128_h 1

#include <stdbool.h>
#include <stdint.h>

#ifdef LITTLEENDIAN
struct uint128 { uint64_t v0, v64; };
#else
struct uint128 { uint64_t v64, v0; };
#endif

#ifdef INLINE

INLINE bool eq128( struct uint128 a, struct uint128 b )
    { return (a.v64 == b.v64) && (a.v0 == b.v0); }

INLINE bool le128( struct uint128 a, struct uint128 b )
    { return (a.v64 < b.v64) || ((a.v64 == b.v64) && (a.v0 <= b.v0)); }

INLINE bool lt128( struct uint128 a, struct uint128 b )
    { return (a.v64 < b.v64) || ((a.v64 == b.v64) && (a.v0 < b.v0)); }

#else

bool eq128( struct uint128, struct uint128 );
bool le128( struct uint128, struct uint128 );
bool lt128( struct uint128, struct uint128 );

#endif

struct uint128 shortShiftLeft128( struct uint128, int );
struct uint128 shortShiftRight128( struct uint128, int );
struct uint128 shortShiftRightJam128( struct uint128, int );
struct uint128 neg128( struct uint128 );
struct uint128 add128( struct uint128, struct uint128 );

#endif