155 lines
5.1 KiB
C
155 lines
5.1 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 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"
|
|
#include "specialize.h"
|
|
|
|
float128_t
|
|
softfloat_addMagsF128(
|
|
uint_fast64_t uiA64,
|
|
uint_fast64_t uiA0,
|
|
uint_fast64_t uiB64,
|
|
uint_fast64_t uiB0,
|
|
bool signZ
|
|
)
|
|
{
|
|
int_fast32_t expA;
|
|
struct uint128 sigA;
|
|
int_fast32_t expB;
|
|
struct uint128 sigB;
|
|
int_fast32_t expDiff;
|
|
struct uint128 uiZ, sigZ;
|
|
int_fast32_t expZ;
|
|
uint_fast64_t sigZExtra;
|
|
struct uint128_extra sig128Extra;
|
|
union ui128_f128 uZ;
|
|
|
|
expA = expF128UI64( uiA64 );
|
|
sigA.v64 = fracF128UI64( uiA64 );
|
|
sigA.v0 = uiA0;
|
|
expB = expF128UI64( uiB64 );
|
|
sigB.v64 = fracF128UI64( uiB64 );
|
|
sigB.v0 = uiB0;
|
|
expDiff = expA - expB;
|
|
if ( ! expDiff ) {
|
|
if ( expA == 0x7FFF ) {
|
|
if ( sigA.v64 | sigA.v0 | sigB.v64 | sigB.v0 ) goto propagateNaN;
|
|
uiZ.v64 = uiA64;
|
|
uiZ.v0 = uiA0;
|
|
goto uiZ;
|
|
}
|
|
sigZ = softfloat_add128( sigA.v64, sigA.v0, sigB.v64, sigB.v0 );
|
|
if ( ! expA ) {
|
|
uiZ.v64 = packToF128UI64( signZ, 0, sigZ.v64 );
|
|
uiZ.v0 = sigZ.v0;
|
|
goto uiZ;
|
|
}
|
|
expZ = expA;
|
|
sigZ.v64 |= UINT64_C( 0x0002000000000000 );
|
|
sigZExtra = 0;
|
|
goto shiftRight1;
|
|
}
|
|
if ( expDiff < 0 ) {
|
|
if ( expB == 0x7FFF ) {
|
|
if ( sigB.v64 | sigB.v0 ) goto propagateNaN;
|
|
uiZ.v64 = packToF128UI64( signZ, 0x7FFF, 0 );
|
|
uiZ.v0 = 0;
|
|
goto uiZ;
|
|
}
|
|
expZ = expB;
|
|
if ( expA ) {
|
|
sigA.v64 |= UINT64_C( 0x0001000000000000 );
|
|
} else {
|
|
++expDiff;
|
|
sigZExtra = 0;
|
|
if ( ! expDiff ) goto newlyAligned;
|
|
}
|
|
sig128Extra =
|
|
softfloat_shiftRightJam128Extra( sigA.v64, sigA.v0, 0, -expDiff );
|
|
sigA = sig128Extra.v;
|
|
sigZExtra = sig128Extra.extra;
|
|
} else {
|
|
if ( expA == 0x7FFF ) {
|
|
if ( sigA.v64 | sigA.v0 ) goto propagateNaN;
|
|
uiZ.v64 = uiA64;
|
|
uiZ.v0 = uiA0;
|
|
goto uiZ;
|
|
}
|
|
expZ = expA;
|
|
if ( expB ) {
|
|
sigB.v64 |= UINT64_C( 0x0001000000000000 );
|
|
} else {
|
|
--expDiff;
|
|
sigZExtra = 0;
|
|
if ( ! expDiff ) goto newlyAligned;
|
|
}
|
|
sig128Extra =
|
|
softfloat_shiftRightJam128Extra( sigB.v64, sigB.v0, 0, expDiff );
|
|
sigB = sig128Extra.v;
|
|
sigZExtra = sig128Extra.extra;
|
|
}
|
|
newlyAligned:
|
|
sigZ =
|
|
softfloat_add128(
|
|
sigA.v64 | UINT64_C( 0x0001000000000000 ),
|
|
sigA.v0,
|
|
sigB.v64,
|
|
sigB.v0
|
|
);
|
|
--expZ;
|
|
if ( sigZ.v64 < UINT64_C( 0x0002000000000000 ) ) goto roundAndPack;
|
|
++expZ;
|
|
shiftRight1:
|
|
sig128Extra =
|
|
softfloat_shortShiftRightJam128Extra(
|
|
sigZ.v64, sigZ.v0, sigZExtra, 1 );
|
|
sigZ = sig128Extra.v;
|
|
sigZExtra = sig128Extra.extra;
|
|
roundAndPack:
|
|
return
|
|
softfloat_roundPackToF128( signZ, expZ, sigZ.v64, sigZ.v0, sigZExtra );
|
|
propagateNaN:
|
|
uiZ = softfloat_propagateNaNF128UI( uiA64, uiA0, uiB64, uiB0 );
|
|
uiZ:
|
|
uZ.ui = uiZ;
|
|
return uZ.f;
|
|
|
|
}
|
|
|