mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-24 23:44:56 +03:00
78 lines
2.7 KiB
C
78 lines
2.7 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"
|
|
|
|
float32_t f64_to_f32( float64_t a )
|
|
{
|
|
union ui64_f64 uA;
|
|
uint_fast64_t uiA;
|
|
bool sign;
|
|
int_fast16_t exp;
|
|
uint_fast64_t sig;
|
|
struct commonNaN commonNaN;
|
|
uint_fast32_t uiZ, sig32;
|
|
union ui32_f32 uZ;
|
|
|
|
uA.f = a;
|
|
uiA = uA.ui;
|
|
sign = signF64UI( uiA );
|
|
exp = expF64UI( uiA );
|
|
sig = fracF64UI( uiA );
|
|
if ( exp == 0x7FF ) {
|
|
if ( sig ) {
|
|
softfloat_f64UIToCommonNaN( uiA, &commonNaN );
|
|
uiZ = softfloat_commonNaNToF32UI( &commonNaN );
|
|
} else {
|
|
uiZ = packToF32UI( sign, 0xFF, 0 );
|
|
}
|
|
goto uiZ;
|
|
}
|
|
sig32 = softfloat_shortShiftRightJam64( sig, 22 );
|
|
if ( ! (exp | sig32) ) {
|
|
uiZ = packToF32UI( sign, 0, 0 );
|
|
goto uiZ;
|
|
}
|
|
return softfloat_roundPackToF32( sign, exp - 0x381, sig32 | 0x40000000 );
|
|
uiZ:
|
|
uZ.ui = uiZ;
|
|
return uZ.f;
|
|
|
|
}
|
|
|