mirror of
https://github.com/urbit/shrub.git
synced 2024-12-23 19:05:48 +03:00
108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3, by John R. Hauser.
|
|
|
|
Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
|
|
(Regents). All Rights Reserved. Redistribution and use in source and binary
|
|
forms, with or without modification, are permitted provided that the following
|
|
conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions, and the following two paragraphs of disclaimer.
|
|
Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions, and the following two paragraphs of disclaimer in the
|
|
documentation and/or other materials provided with the distribution. Neither
|
|
the name of the Regents nor the names of its contributors may be used to
|
|
endorse or promote products derived from this software without specific prior
|
|
written permission.
|
|
|
|
IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
|
|
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
|
|
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
|
|
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
|
|
HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
|
|
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
|
|
=============================================================================*/
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "platform.h"
|
|
#include "internals.h"
|
|
#include "specialize.h"
|
|
#include "softfloat.h"
|
|
|
|
#ifdef SOFTFLOAT_FAST_INT64
|
|
|
|
float32_t extF80M_to_f32( const extFloat80_t *aPtr )
|
|
{
|
|
|
|
return extF80_to_f32( *aPtr );
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
float32_t extF80M_to_f32( const extFloat80_t *aPtr )
|
|
{
|
|
const struct extFloat80M *aSPtr;
|
|
uint_fast16_t uiA64;
|
|
bool sign;
|
|
int32_t exp;
|
|
uint64_t sig;
|
|
struct commonNaN commonNaN;
|
|
uint32_t uiZ, sig32;
|
|
union ui32_f32 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_commonNaNToF32UI( &commonNaN );
|
|
} else {
|
|
uiZ = packToF32UI( sign, 0xFF, 0 );
|
|
}
|
|
goto uiZ;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sig ) {
|
|
uiZ = packToF32UI( sign, 0, 0 );
|
|
goto uiZ;
|
|
}
|
|
exp += softfloat_normExtF80SigM( &sig );
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
sig32 = softfloat_shortShiftRightJam64( sig, 33 );
|
|
exp -= 0x3F81;
|
|
if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
|
|
if ( exp < -0x1000 ) exp = -0x1000;
|
|
}
|
|
return softfloat_roundPackToF32( sign, exp, sig32 | 0x40000000 );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
uiZ:
|
|
uZ.ui = uiZ;
|
|
return uZ.f;
|
|
|
|
}
|
|
|
|
#endif
|
|
|