mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-24 23:44:56 +03:00
83 lines
3.0 KiB
C
83 lines
3.0 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 "softfloat.h"
|
||
|
|
|
||
|
|
int_fast64_t f32_to_i64_r_minMag( float32_t a, bool exact )
|
||
|
|
{
|
||
|
|
union ui32_f32 uA;
|
||
|
|
uint_fast32_t uiA;
|
||
|
|
int_fast16_t exp;
|
||
|
|
uint_fast32_t sig;
|
||
|
|
int_fast16_t shiftCount;
|
||
|
|
bool sign;
|
||
|
|
uint_fast64_t sig64;
|
||
|
|
int_fast64_t absZ;
|
||
|
|
|
||
|
|
uA.f = a;
|
||
|
|
uiA = uA.ui;
|
||
|
|
exp = expF32UI( uiA );
|
||
|
|
sig = fracF32UI( uiA );
|
||
|
|
shiftCount = 0xBE - exp;
|
||
|
|
if ( 64 <= shiftCount ) {
|
||
|
|
if ( exact && (exp | sig) ) {
|
||
|
|
softfloat_exceptionFlags |= softfloat_flag_inexact;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
sign = signF32UI( uiA );
|
||
|
|
if ( shiftCount <= 0 ) {
|
||
|
|
if ( uiA != packToF32UI( 1, 0xBE, 0 ) ) {
|
||
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
||
|
|
if ( ! sign || ((exp == 0xFF) && sig) ) {
|
||
|
|
return INT64_C( 0x7FFFFFFFFFFFFFFF );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
|
||
|
|
}
|
||
|
|
sig |= 0x00800000;
|
||
|
|
sig64 = (uint_fast64_t) sig<<40;
|
||
|
|
absZ = sig64>>shiftCount;
|
||
|
|
shiftCount = 40 - shiftCount;
|
||
|
|
if ( exact && (shiftCount < 0) && (uint32_t) (sig<<(shiftCount & 31)) ) {
|
||
|
|
softfloat_exceptionFlags |= softfloat_flag_inexact;
|
||
|
|
}
|
||
|
|
return sign ? -absZ : absZ;
|
||
|
|
|
||
|
|
}
|
||
|
|
|