148 lines
6.0 KiB
C
148 lines
6.0 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 The Regents of the University of California.
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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 softfloat_addMagsExtF80(uint16_t uiA64, uint64_t uiA0, uint16_t uiB64, uint64_t uiB0, bool signZ, struct softfloat_status_t *status)
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{
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int32_t expA;
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uint64_t sigA;
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int32_t expB;
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uint64_t sigB;
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int32_t expDiff;
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uint64_t sigZ, sigZExtra;
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struct exp32_sig64 normExpSig;
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int32_t expZ;
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struct uint64_extra sig64Extra;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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expA = expExtF80UI64(uiA64);
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sigA = uiA0;
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expB = expExtF80UI64(uiB64);
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sigB = uiB0;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (expA == 0x7FFF) {
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if ((sigA << 1) || ((expB == 0x7FFF) && (sigB << 1)))
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goto propagateNaN;
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if (sigB && ! expB)
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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return packToExtF80(uiA64, uiA0);
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}
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if (expB == 0x7FFF) {
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if (sigB << 1) goto propagateNaN;
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if (sigA && ! expA)
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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return packToExtF80(signZ, 0x7FFF, UINT64_C(0x8000000000000000));
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (! expA) {
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if (! sigA) {
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if (! expB && sigB) {
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalExtF80Sig(sigB);
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expB = normExpSig.exp + 1;
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sigB = normExpSig.sig;
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}
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expZ = expB;
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sigZ = sigB;
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sigZExtra = 0;
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goto roundAndPack;
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}
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalExtF80Sig(sigA);
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expA = normExpSig.exp + 1;
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sigA = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (expB == 0) {
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if (sigB == 0) {
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expZ = expA;
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sigZ = sigA;
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sigZExtra = 0;
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goto roundAndPack;
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}
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalExtF80Sig(sigB);
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expB = normExpSig.exp + 1;
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sigB = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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expDiff = expA - expB;
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if (! expDiff) {
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sigZ = sigA + sigB;
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sigZExtra = 0;
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expZ = expA;
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goto shiftRight1;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (expDiff < 0) {
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expZ = expB;
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sig64Extra = softfloat_shiftRightJam64Extra(sigA, 0, -expDiff);
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sigA = sig64Extra.v;
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sigZExtra = sig64Extra.extra;
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} else {
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expZ = expA;
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sig64Extra = softfloat_shiftRightJam64Extra(sigB, 0, expDiff);
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sigB = sig64Extra.v;
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sigZExtra = sig64Extra.extra;
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}
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sigZ = sigA + sigB;
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if (sigZ & UINT64_C(0x8000000000000000)) goto roundAndPack;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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shiftRight1:
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sig64Extra = softfloat_shortShiftRightJam64Extra(sigZ, sigZExtra, 1);
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sigZ = sig64Extra.v | UINT64_C(0x8000000000000000);
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sigZExtra = sig64Extra.extra;
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++expZ;
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roundAndPack:
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return softfloat_roundPackToExtF80(signZ, expZ, sigZ, sigZExtra, softfloat_extF80_roundingPrecision(status), status);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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propagateNaN:
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return softfloat_propagateNaNExtF80UI(uiA64, uiA0, uiB64, uiB0, status);
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}
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