113 lines
4.3 KiB
C
113 lines
4.3 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 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"
|
||
|
|
|
||
|
|
#ifdef SOFTFLOAT_FAST_INT64
|
||
|
|
|
||
|
|
float16_t extF80M_to_f16( const extFloat80_t *aPtr )
|
||
|
|
{
|
||
|
|
|
||
|
|
return extF80_to_f16( *aPtr );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
float16_t extF80M_to_f16( const extFloat80_t *aPtr )
|
||
|
|
{
|
||
|
|
const struct extFloat80M *aSPtr;
|
||
|
|
uint_fast16_t uiA64;
|
||
|
|
bool sign;
|
||
|
|
int32_t exp;
|
||
|
|
uint64_t sig;
|
||
|
|
struct commonNaN commonNaN;
|
||
|
|
uint16_t uiZ, sig16;
|
||
|
|
union ui16_f16 uZ;
|
||
|
|
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
aSPtr = (const struct extFloat80M *) aPtr;
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
uiA64 = aSPtr->signExp;
|
||
|
|
sign = signExtF80UI64( uiA64 );
|
||
|
|
exp = expExtF80UI64( uiA64 );
|
||
|
|
sig = aSPtr->signif;
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
if ( exp == 0x7FFF ) {
|
||
|
|
if ( sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) {
|
||
|
|
softfloat_extF80MToCommonNaN( aSPtr, &commonNaN );
|
||
|
|
uiZ = softfloat_commonNaNToF16UI( &commonNaN );
|
||
|
|
} else {
|
||
|
|
uiZ = packToF16UI( sign, 0x1F, 0 );
|
||
|
|
}
|
||
|
|
goto uiZ;
|
||
|
|
}
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) {
|
||
|
|
if ( ! sig ) {
|
||
|
|
uiZ = packToF16UI( sign, 0, 0 );
|
||
|
|
goto uiZ;
|
||
|
|
}
|
||
|
|
exp += softfloat_normExtF80SigM( &sig );
|
||
|
|
}
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
sig16 = softfloat_shortShiftRightJam64( sig, 49 );
|
||
|
|
exp -= 0x3FF1;
|
||
|
|
if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
|
||
|
|
if ( exp < -0x40 ) exp = -0x40;
|
||
|
|
}
|
||
|
|
return softfloat_roundPackToF16( sign, exp, sig16 );
|
||
|
|
/*------------------------------------------------------------------------
|
||
|
|
*------------------------------------------------------------------------*/
|
||
|
|
uiZ:
|
||
|
|
uZ.ui = uiZ;
|
||
|
|
return uZ.f;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|