mirror of
https://github.com/ziglang/zig.git
synced 2024-11-27 15:42:49 +00:00
103 lines
3.9 KiB
C
103 lines
3.9 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"
|
|
|
|
#ifdef SOFTFLOAT_FAST_INT64
|
|
|
|
int_fast64_t
|
|
f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact )
|
|
{
|
|
|
|
return f128_to_i64( *aPtr, roundingMode, exact );
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
int_fast64_t
|
|
f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact )
|
|
{
|
|
const uint32_t *aWPtr;
|
|
uint32_t uiA96;
|
|
bool sign;
|
|
int32_t exp;
|
|
uint32_t sig96;
|
|
int32_t shiftDist;
|
|
uint32_t sig[4];
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
aWPtr = (const uint32_t *) aPtr;
|
|
uiA96 = aWPtr[indexWordHi( 4 )];
|
|
sign = signF128UI96( uiA96 );
|
|
exp = expF128UI96( uiA96 );
|
|
sig96 = fracF128UI96( uiA96 );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
shiftDist = 0x404F - exp;
|
|
if ( shiftDist < 17 ) {
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
return
|
|
(exp == 0x7FFF)
|
|
&& (sig96
|
|
|| (aWPtr[indexWord( 4, 2 )] | aWPtr[indexWord( 4, 1 )]
|
|
| aWPtr[indexWord( 4, 0 )]))
|
|
? i64_fromNaN
|
|
: sign ? i64_fromNegOverflow : i64_fromPosOverflow;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( exp ) sig96 |= 0x00010000;
|
|
sig[indexWord( 4, 3 )] = sig96;
|
|
sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )];
|
|
sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )];
|
|
sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )];
|
|
softfloat_shiftRightJam128M( sig, shiftDist, sig );
|
|
return
|
|
softfloat_roundMToI64(
|
|
sign, sig + indexMultiwordLo( 4, 3 ), roundingMode, exact );
|
|
|
|
}
|
|
|
|
#endif
|
|
|