mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-24 07:26:51 +03:00
127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3c, 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"
|
|
#include "specialize.h"
|
|
|
|
float32_t softfloat_addMagsF32( uint_fast32_t uiA, uint_fast32_t uiB )
|
|
{
|
|
int_fast16_t expA;
|
|
uint_fast32_t sigA;
|
|
int_fast16_t expB;
|
|
uint_fast32_t sigB;
|
|
int_fast16_t expDiff;
|
|
uint_fast32_t uiZ;
|
|
bool signZ;
|
|
int_fast16_t expZ;
|
|
uint_fast32_t sigZ;
|
|
union ui32_f32 uZ;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
expA = expF32UI( uiA );
|
|
sigA = fracF32UI( uiA );
|
|
expB = expF32UI( uiB );
|
|
sigB = fracF32UI( uiB );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
expDiff = expA - expB;
|
|
if ( ! expDiff ) {
|
|
/*--------------------------------------------------------------------
|
|
*--------------------------------------------------------------------*/
|
|
if ( ! expA ) {
|
|
uiZ = uiA + sigB;
|
|
goto uiZ;
|
|
}
|
|
if ( expA == 0xFF ) {
|
|
if ( sigA | sigB ) goto propagateNaN;
|
|
uiZ = uiA;
|
|
goto uiZ;
|
|
}
|
|
signZ = signF32UI( uiA );
|
|
expZ = expA;
|
|
sigZ = 0x01000000 + sigA + sigB;
|
|
if ( ! (sigZ & 1) && (expZ < 0xFE) ) {
|
|
uiZ = packToF32UI( signZ, expZ, sigZ>>1 );
|
|
goto uiZ;
|
|
}
|
|
sigZ <<= 6;
|
|
} else {
|
|
/*--------------------------------------------------------------------
|
|
*--------------------------------------------------------------------*/
|
|
signZ = signF32UI( uiA );
|
|
sigA <<= 6;
|
|
sigB <<= 6;
|
|
if ( expDiff < 0 ) {
|
|
if ( expB == 0xFF ) {
|
|
if ( sigB ) goto propagateNaN;
|
|
uiZ = packToF32UI( signZ, 0xFF, 0 );
|
|
goto uiZ;
|
|
}
|
|
expZ = expB;
|
|
sigA += expA ? 0x20000000 : sigA;
|
|
sigA = softfloat_shiftRightJam32( sigA, -expDiff );
|
|
} else {
|
|
if ( expA == 0xFF ) {
|
|
if ( sigA ) goto propagateNaN;
|
|
uiZ = uiA;
|
|
goto uiZ;
|
|
}
|
|
expZ = expA;
|
|
sigB += expB ? 0x20000000 : sigB;
|
|
sigB = softfloat_shiftRightJam32( sigB, expDiff );
|
|
}
|
|
sigZ = 0x20000000 + sigA + sigB;
|
|
if ( sigZ < 0x40000000 ) {
|
|
--expZ;
|
|
sigZ <<= 1;
|
|
}
|
|
}
|
|
return softfloat_roundPackToF32( signZ, expZ, sigZ );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
propagateNaN:
|
|
uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
|
|
uiZ:
|
|
uZ.ui = uiZ;
|
|
return uZ.f;
|
|
|
|
}
|
|
|