82 lines
3.1 KiB
C
82 lines
3.1 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 <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include "platform.h"
|
||
|
|
#include "internals.h"
|
||
|
|
|
||
|
|
float128_t
|
||
|
|
softfloat_normRoundPackToF128(
|
||
|
|
bool sign, int_fast32_t exp, uint_fast64_t sig64, uint_fast64_t sig0 )
|
||
|
|
{
|
||
|
|
int_fast8_t shiftDist;
|
||
|
|
struct uint128 sig128;
|
||
|
|
union ui128_f128 uZ;
|
||
|
|
uint_fast64_t sigExtra;
|
||
|
|
struct uint128_extra sig128Extra;
|
||
|
|
|
||
|
|
if ( ! sig64 ) {
|
||
|
|
exp -= 64;
|
||
|
|
sig64 = sig0;
|
||
|
|
sig0 = 0;
|
||
|
|
}
|
||
|
|
shiftDist = softfloat_countLeadingZeros64( sig64 ) - 15;
|
||
|
|
exp -= shiftDist;
|
||
|
|
if ( 0 <= shiftDist ) {
|
||
|
|
if ( shiftDist ) {
|
||
|
|
sig128 = softfloat_shortShiftLeft128( sig64, sig0, shiftDist );
|
||
|
|
sig64 = sig128.v64;
|
||
|
|
sig0 = sig128.v0;
|
||
|
|
}
|
||
|
|
if ( (uint32_t) exp < 0x7FFD ) {
|
||
|
|
uZ.ui.v64 = packToF128UI64( sign, sig64 | sig0 ? exp : 0, sig64 );
|
||
|
|
uZ.ui.v0 = sig0;
|
||
|
|
return uZ.f;
|
||
|
|
}
|
||
|
|
sigExtra = 0;
|
||
|
|
} else {
|
||
|
|
sig128Extra =
|
||
|
|
softfloat_shortShiftRightJam128Extra( sig64, sig0, 0, -shiftDist );
|
||
|
|
sig64 = sig128Extra.v.v64;
|
||
|
|
sig0 = sig128Extra.v.v0;
|
||
|
|
sigExtra = sig128Extra.extra;
|
||
|
|
}
|
||
|
|
return softfloat_roundPackToF128( sign, exp, sig64, sig0, sigExtra );
|
||
|
|
|
||
|
|
}
|
||
|
|
|