Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3e, by John R. Hauser.
|
|
|
|
Copyright 2011, 2012, 2013, 2014, 2015 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 <stdint.h>
|
|
#include "platform.h"
|
|
#include "primitiveTypes.h"
|
|
|
|
#ifndef softfloat_mul64To128M
|
|
|
|
void softfloat_mul64To128M( uint64_t a, uint64_t b, uint32_t *zPtr )
|
|
{
|
|
uint32_t a32, a0, b32, b0;
|
|
uint64_t z0, mid1, z64, mid;
|
|
|
|
a32 = a>>32;
|
|
a0 = a;
|
|
b32 = b>>32;
|
|
b0 = b;
|
|
z0 = (uint64_t) a0 * b0;
|
|
mid1 = (uint64_t) a32 * b0;
|
|
mid = mid1 + (uint64_t) a0 * b32;
|
|
z64 = (uint64_t) a32 * b32;
|
|
z64 += (uint64_t) (mid < mid1)<<32 | mid>>32;
|
|
mid <<= 32;
|
|
z0 += mid;
|
|
zPtr[indexWord( 4, 1 )] = z0>>32;
|
|
zPtr[indexWord( 4, 0 )] = z0;
|
|
z64 += (z0 < mid);
|
|
zPtr[indexWord( 4, 3 )] = z64>>32;
|
|
zPtr[indexWord( 4, 2 )] = z64;
|
|
|
|
}
|
|
|
|
#endif
|
|
|