mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-23 23:12:04 +03:00
79 lines
3.0 KiB
C
79 lines
3.0 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3c, by John R. Hauser.
|
|
|
|
Copyright 2011, 2012, 2013, 2014, 2015, 2016 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 <stdint.h>
|
|
#include "platform.h"
|
|
#include "internals.h"
|
|
|
|
int
|
|
softfloat_shiftNormSigF128M(
|
|
const uint32_t *wPtr, uint_fast8_t shiftDist, uint32_t *sigPtr )
|
|
{
|
|
uint32_t wordSig;
|
|
int32_t exp;
|
|
uint32_t leadingBit;
|
|
|
|
wordSig = wPtr[indexWordHi( 4 )];
|
|
exp = expF128UI96( wordSig );
|
|
if ( exp ) {
|
|
softfloat_shortShiftLeft128M( wPtr, shiftDist, sigPtr );
|
|
leadingBit = 0x00010000<<shiftDist;
|
|
sigPtr[indexWordHi( 4 )] =
|
|
(sigPtr[indexWordHi( 4 )] & (leadingBit - 1)) | leadingBit;
|
|
} else {
|
|
exp = 16;
|
|
wordSig &= 0x7FFFFFFF;
|
|
if ( ! wordSig ) {
|
|
exp = -16;
|
|
wordSig = wPtr[indexWord( 4, 2 )];
|
|
if ( ! wordSig ) {
|
|
exp = -48;
|
|
wordSig = wPtr[indexWord( 4, 1 )];
|
|
if ( ! wordSig ) {
|
|
wordSig = wPtr[indexWord( 4, 0 )];
|
|
if ( ! wordSig ) return -128;
|
|
exp = -80;
|
|
}
|
|
}
|
|
}
|
|
exp -= softfloat_countLeadingZeros32( wordSig );
|
|
softfloat_shiftLeft128M( wPtr, 1 - exp + shiftDist, sigPtr );
|
|
}
|
|
return exp;
|
|
|
|
}
|
|
|