187 lines
7.1 KiB
C
187 lines
7.1 KiB
C
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/*============================================================================
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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 "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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void
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softfloat_addExtF80M(
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const struct extFloat80M *aSPtr,
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const struct extFloat80M *bSPtr,
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struct extFloat80M *zSPtr,
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bool negateB
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)
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{
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uint32_t uiA64;
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int32_t expA;
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uint32_t uiB64;
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int32_t expB;
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uint32_t uiZ64;
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bool signZ, signB;
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const struct extFloat80M *tempSPtr;
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uint64_t sigZ, sigB;
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void
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(*roundPackRoutinePtr)(
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bool, int32_t, uint32_t *, uint_fast8_t, struct extFloat80M * );
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int32_t expDiff;
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uint32_t extSigX[3], sigZExtra;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = aSPtr->signExp;
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expA = expExtF80UI64( uiA64 );
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uiB64 = bSPtr->signExp;
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expB = expExtF80UI64( uiB64 );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
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if ( softfloat_tryPropagateNaNExtF80M( aSPtr, bSPtr, zSPtr ) ) return;
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uiZ64 = uiA64;
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if ( expB == 0x7FFF ) {
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uiZ64 = uiB64 ^ packToExtF80UI64( negateB, 0 );
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if ( (expA == 0x7FFF) && (uiZ64 != uiA64) ) {
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softfloat_invalidExtF80M( zSPtr );
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return;
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}
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}
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zSPtr->signExp = uiZ64;
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zSPtr->signif = UINT64_C( 0x8000000000000000 );
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return;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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signZ = signExtF80UI64( uiA64 );
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signB = signExtF80UI64( uiB64 ) ^ negateB;
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negateB = (signZ != signB);
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if ( expA < expB ) {
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signZ = signB;
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expA = expB;
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expB = expExtF80UI64( uiA64 );
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tempSPtr = aSPtr;
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aSPtr = bSPtr;
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bSPtr = tempSPtr;
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}
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if ( ! expB ) {
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expB = 1;
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if ( ! expA ) expA = 1;
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}
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sigZ = aSPtr->signif;
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sigB = bSPtr->signif;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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roundPackRoutinePtr = softfloat_roundPackMToExtF80M;
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expDiff = expA - expB;
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if ( expDiff ) {
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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extSigX[indexWord( 3, 2 )] = sigB>>32;
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extSigX[indexWord( 3, 1 )] = sigB;
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extSigX[indexWord( 3, 0 )] = 0;
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softfloat_shiftRightJam96M( extSigX, expDiff, extSigX );
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sigB =
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(uint64_t) extSigX[indexWord( 3, 2 )]<<32
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| extSigX[indexWord( 3, 1 )];
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if ( negateB ) {
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sigZ -= sigB;
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sigZExtra = extSigX[indexWordLo( 3 )];
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if ( sigZExtra ) {
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--sigZ;
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sigZExtra = -sigZExtra;
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}
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if ( ! (sigZ & UINT64_C( 0x8000000000000000 )) ) {
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if ( sigZ & UINT64_C( 0x4000000000000000 ) ) {
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--expA;
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sigZ = sigZ<<1 | sigZExtra>>31;
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sigZExtra <<= 1;
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} else {
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roundPackRoutinePtr = softfloat_normRoundPackMToExtF80M;
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}
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}
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} else {
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sigZ += sigB;
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if ( sigZ & UINT64_C( 0x8000000000000000 ) ) goto sigZ;
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sigZExtra = (uint32_t) sigZ<<31 | (extSigX[indexWordLo( 3 )] != 0);
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goto completeNormAfterAdd;
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}
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} else {
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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sigZExtra = 0;
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if ( negateB ) {
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if ( sigZ < sigB ) {
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signZ = ! signZ;
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sigZ = sigB - sigZ;
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} else {
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sigZ -= sigB;
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if ( ! sigZ ) {
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signZ = (softfloat_roundingMode == softfloat_round_min);
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zSPtr->signExp = packToExtF80UI64( signZ, 0 );
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zSPtr->signif = 0;
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return;
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}
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}
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roundPackRoutinePtr = softfloat_normRoundPackMToExtF80M;
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} else {
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sigZ += sigB;
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if ( sigZ < sigB ) {
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sigZExtra = (uint32_t) sigZ<<31;
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completeNormAfterAdd:
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++expA;
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sigZ = UINT64_C( 0x8000000000000000 ) | sigZ>>1;
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} else {
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if ( ! (sigZ & UINT64_C( 0x8000000000000000 )) ) {
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roundPackRoutinePtr = softfloat_normRoundPackMToExtF80M;
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}
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}
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}
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}
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extSigX[indexWord( 3, 0 )] = sigZExtra;
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sigZ:
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extSigX[indexWord( 3, 2 )] = sigZ>>32;
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extSigX[indexWord( 3, 1 )] = sigZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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roundPack:
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(*roundPackRoutinePtr)(
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signZ, expA, extSigX, extF80_roundingPrecision, zSPtr );
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}
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