mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-12 05:04:56 +03:00
100 lines
3.3 KiB
C
100 lines
3.3 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
|
|
|
|
float64_t f128M_to_f64( const float128_t *aPtr )
|
|
{
|
|
|
|
return f128_to_f64( *aPtr );
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
float64_t f128M_to_f64( const float128_t *aPtr )
|
|
{
|
|
const uint32_t *aWPtr;
|
|
uint32_t uiA96;
|
|
bool sign;
|
|
int32_t exp;
|
|
uint64_t sig64;
|
|
struct commonNaN commonNaN;
|
|
uint64_t uiZ;
|
|
uint32_t sig32;
|
|
union ui64_f64 uZ;
|
|
|
|
aWPtr = (const uint32_t *) aPtr;
|
|
uiA96 = aWPtr[indexWordHi( 4 )];
|
|
sign = signF128UI96( uiA96 );
|
|
exp = expF128UI96( uiA96 );
|
|
sig64 = (uint64_t) fracF128UI96( uiA96 )<<32 | aWPtr[indexWord( 4, 2 )];
|
|
if ( exp == 0x7FFF ) {
|
|
if ( sig64 || aWPtr[indexWord( 4, 1 )] | aWPtr[indexWord( 4, 0 )] ) {
|
|
softfloat_f128MToCommonNaN( aWPtr, &commonNaN );
|
|
uiZ = softfloat_commonNaNToF64UI( &commonNaN );
|
|
} else {
|
|
uiZ = packToF64UI( sign, 0x7FF, 0 );
|
|
}
|
|
goto uiZ;
|
|
}
|
|
sig32 = aWPtr[indexWord( 4, 1 )];
|
|
sig64 = sig64<<14 | sig32>>18;
|
|
if ( (sig32 & 0x0003FFFF) || aWPtr[indexWord( 4, 0 )] ) sig64 |= 1;
|
|
if ( ! exp && ! sig64 ) {
|
|
uiZ = packToF64UI( sign, 0, 0 );
|
|
goto uiZ;
|
|
}
|
|
exp -= 0x3C01;
|
|
if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
|
|
if ( exp < -0x1000 ) exp = -0x1000;
|
|
}
|
|
return
|
|
softfloat_roundPackToF64(
|
|
sign, exp, sig64 | UINT64_C( 0x4000000000000000 ) );
|
|
uiZ:
|
|
uZ.ui = uiZ;
|
|
return uZ.f;
|
|
|
|
}
|
|
|
|
#endif
|
|
|