Eyck Jentzsch
dcaf5467e8
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
107 lines
4.4 KiB
C
107 lines
4.4 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, 2018 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"
|
|
#include "softfloat.h"
|
|
|
|
/*----------------------------------------------------------------------------
|
|
| Interpreting the unsigned integer formed from concatenating 'uiA64' and
|
|
| 'uiA0' as an 80-bit extended floating-point value, and likewise interpreting
|
|
| the unsigned integer formed from concatenating 'uiB64' and 'uiB0' as another
|
|
| 80-bit extended floating-point value, and assuming at least on of these
|
|
| floating-point values is a NaN, returns the bit pattern of the combined NaN
|
|
| result. If either original floating-point value is a signaling NaN, the
|
|
| invalid exception is raised.
|
|
*----------------------------------------------------------------------------*/
|
|
struct uint128
|
|
softfloat_propagateNaNExtF80UI(
|
|
uint_fast16_t uiA64,
|
|
uint_fast64_t uiA0,
|
|
uint_fast16_t uiB64,
|
|
uint_fast64_t uiB0
|
|
)
|
|
{
|
|
bool isSigNaNA, isSigNaNB;
|
|
uint_fast64_t uiNonsigA0, uiNonsigB0;
|
|
uint_fast16_t uiMagA64, uiMagB64;
|
|
struct uint128 uiZ;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
isSigNaNA = softfloat_isSigNaNExtF80UI( uiA64, uiA0 );
|
|
isSigNaNB = softfloat_isSigNaNExtF80UI( uiB64, uiB0 );
|
|
/*------------------------------------------------------------------------
|
|
| Make NaNs non-signaling.
|
|
*------------------------------------------------------------------------*/
|
|
uiNonsigA0 = uiA0 | UINT64_C( 0xC000000000000000 );
|
|
uiNonsigB0 = uiB0 | UINT64_C( 0xC000000000000000 );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( isSigNaNA | isSigNaNB ) {
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
if ( isSigNaNA ) {
|
|
if ( isSigNaNB ) goto returnLargerMag;
|
|
if ( isNaNExtF80UI( uiB64, uiB0 ) ) goto returnB;
|
|
goto returnA;
|
|
} else {
|
|
if ( isNaNExtF80UI( uiA64, uiA0 ) ) goto returnA;
|
|
goto returnB;
|
|
}
|
|
}
|
|
returnLargerMag:
|
|
uiMagA64 = uiA64 & 0x7FFF;
|
|
uiMagB64 = uiB64 & 0x7FFF;
|
|
if ( uiMagA64 < uiMagB64 ) goto returnB;
|
|
if ( uiMagB64 < uiMagA64 ) goto returnA;
|
|
if ( uiA0 < uiB0 ) goto returnB;
|
|
if ( uiB0 < uiA0 ) goto returnA;
|
|
if ( uiA64 < uiB64 ) goto returnA;
|
|
returnB:
|
|
uiZ.v64 = uiB64;
|
|
uiZ.v0 = uiNonsigB0;
|
|
return uiZ;
|
|
returnA:
|
|
uiZ.v64 = uiA64;
|
|
uiZ.v0 = uiNonsigA0;
|
|
return uiZ;
|
|
|
|
}
|
|
|