mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-26 00:12:28 +03:00
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
|
|
||
|
|
/*============================================================================
|
||
|
|
|
||
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
||
|
|
Package, Release 3, by John R. Hauser.
|
||
|
|
|
||
|
|
Copyright 2011, 2012, 2013, 2014, 2015 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 <stdint.h>
|
||
|
|
#include "platform.h"
|
||
|
|
#include "primitiveTypes.h"
|
||
|
|
|
||
|
|
#ifndef softfloat_mul64To128
|
||
|
|
|
||
|
|
struct uint128 softfloat_mul64To128( uint64_t a, uint64_t b )
|
||
|
|
{
|
||
|
|
uint32_t a32, a0, b32, b0;
|
||
|
|
struct uint128 z;
|
||
|
|
uint64_t mid1, mid;
|
||
|
|
|
||
|
|
a32 = a>>32;
|
||
|
|
a0 = a;
|
||
|
|
b32 = b>>32;
|
||
|
|
b0 = b;
|
||
|
|
z.v0 = (uint_fast64_t) a0 * b0;
|
||
|
|
mid1 = (uint_fast64_t) a32 * b0;
|
||
|
|
mid = mid1 + (uint_fast64_t) a0 * b32;
|
||
|
|
z.v64 = (uint_fast64_t) a32 * b32;
|
||
|
|
z.v64 += (uint_fast64_t) (mid < mid1)<<32 | mid>>32;
|
||
|
|
mid <<= 32;
|
||
|
|
z.v0 += mid;
|
||
|
|
z.v64 += (z.v0 < mid);
|
||
|
|
return z;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|