77 lines
2.9 KiB
C
77 lines
2.9 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 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 "internals.h"
|
|
#include "primitives.h"
|
|
#include "specialize.h"
|
|
#include "softfloat.h"
|
|
|
|
float128_t extF80_to_f128(extFloat80_t a, struct softfloat_status_t *status)
|
|
{
|
|
uint16_t uiA64;
|
|
uint64_t uiA0;
|
|
uint16_t exp;
|
|
uint64_t frac;
|
|
struct commonNaN commonNaN;
|
|
struct uint128 uiZ;
|
|
bool sign;
|
|
struct uint128 frac128;
|
|
|
|
// handle unsupported extended double-precision floating encodings
|
|
if (extF80_isUnsupported(a)) {
|
|
softfloat_raiseFlags(status, softfloat_flag_invalid);
|
|
uiZ.v64 = defaultNaNF128UI64;
|
|
uiZ.v0 = defaultNaNF128UI0;
|
|
return uiZ;
|
|
}
|
|
|
|
uiA64 = a.signExp;
|
|
uiA0 = a.signif;
|
|
exp = expExtF80UI64(uiA64);
|
|
frac = uiA0 & UINT64_C(0x7FFFFFFFFFFFFFFF);
|
|
if ((exp == 0x7FFF) && frac) {
|
|
softfloat_extF80UIToCommonNaN(uiA64, uiA0, &commonNaN, status);
|
|
uiZ = softfloat_commonNaNToF128UI(&commonNaN);
|
|
} else {
|
|
sign = signExtF80UI64(uiA64);
|
|
frac128 = softfloat_shortShiftLeft128(0, frac, 49);
|
|
uiZ.v64 = packToF128UI64(sign, exp, frac128.v64);
|
|
uiZ.v0 = frac128.v0;
|
|
}
|
|
return uiZ;
|
|
}
|