mirror of
https://github.com/urbit/shrub.git
synced 2024-12-23 19:05:48 +03:00
76 lines
2.8 KiB
C
76 lines
2.8 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"
|
|
|
|
void
|
|
softfloat_normRoundPackMToExtF80M(
|
|
bool sign,
|
|
int32_t exp,
|
|
uint32_t *extSigPtr,
|
|
uint_fast8_t roundingPrecision,
|
|
struct extFloat80M *zSPtr
|
|
)
|
|
{
|
|
int_fast16_t shiftCount;
|
|
uint32_t wordSig;
|
|
|
|
shiftCount = 0;
|
|
wordSig = extSigPtr[indexWord( 3, 2 )];
|
|
if ( ! wordSig ) {
|
|
shiftCount = 32;
|
|
wordSig = extSigPtr[indexWord( 3, 1 )];
|
|
if ( ! wordSig ) {
|
|
shiftCount = 64;
|
|
wordSig = extSigPtr[indexWord( 3, 0 )];
|
|
if ( ! wordSig ) {
|
|
zSPtr->signExp = packToExtF80UI64( sign, 0 );
|
|
zSPtr->signif = 0;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
shiftCount += softfloat_countLeadingZeros32( wordSig );
|
|
if ( shiftCount ) {
|
|
exp -= shiftCount;
|
|
softfloat_shiftLeft96M( extSigPtr, shiftCount, extSigPtr );
|
|
}
|
|
softfloat_roundPackMToExtF80M(
|
|
sign, exp, extSigPtr, roundingPrecision, zSPtr );
|
|
|
|
}
|
|
|