69 lines
2.6 KiB
C
69 lines
2.6 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, 2016 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 "internals.h"
|
||
|
|
#include "softfloat.h"
|
||
|
|
|
||
|
|
float128_t ui64_to_f128( uint64_t a )
|
||
|
|
{
|
||
|
|
uint_fast64_t uiZ64, uiZ0;
|
||
|
|
int_fast8_t shiftDist;
|
||
|
|
struct uint128 zSig;
|
||
|
|
union ui128_f128 uZ;
|
||
|
|
|
||
|
|
if ( ! a ) {
|
||
|
|
uiZ64 = 0;
|
||
|
|
uiZ0 = 0;
|
||
|
|
} else {
|
||
|
|
shiftDist = softfloat_countLeadingZeros64( a ) + 49;
|
||
|
|
if ( 64 <= shiftDist ) {
|
||
|
|
zSig.v64 = a<<(shiftDist - 64);
|
||
|
|
zSig.v0 = 0;
|
||
|
|
} else {
|
||
|
|
zSig = softfloat_shortShiftLeft128( 0, a, shiftDist );
|
||
|
|
}
|
||
|
|
uiZ64 = packToF128UI64( 0, 0x406E - shiftDist, zSig.v64 );
|
||
|
|
uiZ0 = zSig.v0;
|
||
|
|
}
|
||
|
|
uZ.ui.v64 = uiZ64;
|
||
|
|
uZ.ui.v0 = uiZ0;
|
||
|
|
return uZ.f;
|
||
|
|
|
||
|
|
}
|
||
|
|
|