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Diffstat (limited to 'source/uint128.c')
-rw-r--r-- | source/uint128.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/source/uint128.c b/source/uint128.c new file mode 100644 index 0000000..04520cf --- /dev/null +++ b/source/uint128.c @@ -0,0 +1,96 @@ + +/*============================================================================ + +This C source file is part of TestFloat, Release 3, 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 The Regents of the University of California +(Regents). All Rights Reserved. Redistribution and use in source and binary +forms, with or without modification, are permitted provided that the following +conditions are met: + +Redistributions of source code must retain the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer. +Redistributions in binary form must reproduce the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer in the +documentation and/or other materials provided with the distribution. Neither +the name of the Regents nor the names of its contributors may be used to +endorse or promote products derived from this software without specific prior +written permission. + +IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, +SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING +OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS +BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED +TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED +HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE +MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "uint128.h" + +struct uint128 shortShiftLeft128( struct uint128 a, int count ) +{ + struct uint128 z; + + z.v64 = a.v64<<count | a.v0>>(-count & 63); + z.v0 = a.v0<<count; + return z; + +} + +struct uint128 shortShiftRight128( struct uint128 a, int count ) +{ + struct uint128 z; + + z.v64 = a.v64>>count; + z.v0 = a.v64<<(-count & 63) | a.v0>>count; + return z; + +} + +struct uint128 shortShiftRightJam128( struct uint128 a, int count ) +{ + int negCount; + struct uint128 z; + + negCount = -count; + z.v64 = a.v64>>count; + z.v0 = + a.v64<<(negCount & 63) | a.v0>>count + | ((uint64_t) (a.v0<<(negCount & 63)) != 0); + return z; + +} + +struct uint128 neg128( struct uint128 a ) +{ + + if ( a.v0 ) { + a.v64 = ~a.v64; + a.v0 = -a.v0; + } else { + a.v64 = -a.v64; + } + return a; + +} + +struct uint128 add128( struct uint128 a, struct uint128 b ) +{ + struct uint128 z; + + z.v0 = a.v0 + b.v0; + z.v64 = a.v64 + b.v64 + (z.v0 < a.v0); + return z; + +} + |