95 lines
3.9 KiB
C++
95 lines
3.9 KiB
C++
/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "internals.h"
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#include "primitives.h"
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#include "specialize.h"
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#include "softfloat.h"
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extFloat80_t f128_to_extF80(float128_t a, struct softfloat_status_t *status)
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{
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uint64_t uiA64, uiA0;
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bool sign;
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int32_t exp;
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uint64_t frac64, frac0;
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struct commonNaN commonNaN;
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struct uint128 uiZ;
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uint16_t uiZ64;
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uint64_t uiZ0;
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struct exp32_sig128 normExpSig;
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struct uint128 sig128;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = a.v64;
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uiA0 = a.v0;
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sign = signF128UI64(uiA64);
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exp = expF128UI64(uiA64);
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frac64 = fracF128UI64(uiA64);
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frac0 = uiA0;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (exp == 0x7FFF) {
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if (frac64 | frac0) {
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softfloat_f128UIToCommonNaN(uiA64, uiA0, &commonNaN, status);
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uiZ = softfloat_commonNaNToExtF80UI(&commonNaN);
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uiZ64 = uiZ.v64;
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uiZ0 = uiZ.v0;
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} else {
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uiZ64 = packToExtF80UI64(sign, 0x7FFF);
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uiZ0 = UINT64_C(0x8000000000000000);
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}
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return packToExtF80_twoargs(uiZ64, uiZ0);
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (! exp) {
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if (! (frac64 | frac0)) {
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return packToExtF80(sign, 0, 0);
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}
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalF128Sig(frac64, frac0);
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exp = normExpSig.exp;
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frac64 = normExpSig.sig.v64;
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frac0 = normExpSig.sig.v0;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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sig128 = softfloat_shortShiftLeft128(frac64 | UINT64_C(0x0001000000000000), frac0, 15);
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return softfloat_roundPackToExtF80(sign, exp, sig128.v64, sig128.v0, 80, status);
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}
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