forked from Github_Repos/cvw
102 lines
3.8 KiB
C
102 lines
3.8 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, 2016, 2017 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"
|
|
|
|
int_fast64_t
|
|
softfloat_roundToI64(
|
|
bool sign,
|
|
uint_fast64_t sig,
|
|
uint_fast64_t sigExtra,
|
|
uint_fast8_t roundingMode,
|
|
bool exact
|
|
)
|
|
{
|
|
union { uint64_t ui; int64_t i; } uZ;
|
|
int_fast64_t z;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if (
|
|
(roundingMode == softfloat_round_near_maxMag)
|
|
|| (roundingMode == softfloat_round_near_even)
|
|
) {
|
|
if ( UINT64_C( 0x8000000000000000 ) <= sigExtra ) goto increment;
|
|
} else {
|
|
if (
|
|
sigExtra
|
|
&& (sign
|
|
? (roundingMode == softfloat_round_min)
|
|
#ifdef SOFTFLOAT_ROUND_ODD
|
|
|| (roundingMode == softfloat_round_odd)
|
|
#endif
|
|
: (roundingMode == softfloat_round_max))
|
|
) {
|
|
increment:
|
|
++sig;
|
|
if ( !sig ) goto invalid;
|
|
if (
|
|
(sigExtra == UINT64_C( 0x8000000000000000 ))
|
|
&& (roundingMode == softfloat_round_near_even)
|
|
) {
|
|
sig &= ~(uint_fast64_t) 1;
|
|
}
|
|
}
|
|
}
|
|
uZ.ui = sign ? -sig : sig;
|
|
z = uZ.i;
|
|
if ( z && ((z < 0) ^ sign) ) goto invalid;
|
|
if ( sigExtra ) {
|
|
#ifdef SOFTFLOAT_ROUND_ODD
|
|
if ( roundingMode == softfloat_round_odd ) z |= 1;
|
|
#endif
|
|
if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
|
|
}
|
|
return z;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
invalid:
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
return sign ? i64_fromNegOverflow : i64_fromPosOverflow;
|
|
|
|
}
|
|
|