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https://github.com/openhwgroup/cvw
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212 lines
8.1 KiB
C
212 lines
8.1 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_addF128M(
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const uint32_t *aWPtr,
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const uint32_t *bWPtr,
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uint32_t *zWPtr,
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bool negateB
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)
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{
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uint32_t uiA96;
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int32_t expA;
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uint32_t uiB96;
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int32_t expB;
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uint32_t uiZ96;
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bool signZ, signB;
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const uint32_t *tempPtr;
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uint32_t sig96A, sig96B;
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int32_t expDiff;
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uint_fast8_t
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(*addCarryMRoutinePtr)(
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uint_fast8_t,
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const uint32_t *,
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const uint32_t *,
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uint_fast8_t,
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uint32_t *
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);
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uint32_t extSigZ[5], wordSigZ;
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uint_fast8_t carry;
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void (*roundPackRoutinePtr)( bool, int32_t, uint32_t *, uint32_t * );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA96 = aWPtr[indexWordHi( 4 )];
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expA = expF128UI96( uiA96 );
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uiB96 = bWPtr[indexWordHi( 4 )];
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expB = expF128UI96( uiB96 );
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
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if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return;
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uiZ96 = uiA96;
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if ( expB == 0x7FFF ) {
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uiZ96 = uiB96 ^ packToF128UI96( negateB, 0, 0 );
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if ( (expA == 0x7FFF) && (uiZ96 != uiA96) ) {
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softfloat_invalidF128M( zWPtr );
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return;
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}
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}
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zWPtr[indexWordHi( 4 )] = uiZ96;
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zWPtr[indexWord( 4, 2 )] = 0;
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zWPtr[indexWord( 4, 1 )] = 0;
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zWPtr[indexWord( 4, 0 )] = 0;
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return;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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signZ = signF128UI96( uiA96 );
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signB = signF128UI96( uiB96 ) ^ negateB;
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negateB = (signZ != signB);
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if ( (uint32_t) (uiA96<<1) < (uint32_t) (uiB96<<1) ) {
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signZ = signB;
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expA = expB;
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expB = expF128UI96( uiA96 );
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tempPtr = aWPtr;
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aWPtr = bWPtr;
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bWPtr = tempPtr;
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uiA96 = uiB96;
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uiB96 = bWPtr[indexWordHi( 4 )];
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}
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sig96A = fracF128UI96( uiA96 );
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sig96B = fracF128UI96( uiB96 );
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if ( expA ) {
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--expA;
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sig96A |= 0x00010000;
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if ( expB ) {
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--expB;
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sig96B |= 0x00010000;
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}
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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addCarryMRoutinePtr =
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negateB ? softfloat_addComplCarryM : softfloat_addCarryM;
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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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extSigZ[indexWordHi( 5 )] = sig96B;
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extSigZ[indexWord( 5, 3 )] = bWPtr[indexWord( 4, 2 )];
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extSigZ[indexWord( 5, 2 )] = bWPtr[indexWord( 4, 1 )];
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extSigZ[indexWord( 5, 1 )] = bWPtr[indexWord( 4, 0 )];
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extSigZ[indexWord( 5, 0 )] = 0;
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softfloat_shiftRightJam160M( extSigZ, expDiff, extSigZ );
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sig96B = extSigZ[indexWordHi( 5 )];
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carry = 0;
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if ( negateB ) {
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sig96B = ~sig96B;
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wordSigZ = extSigZ[indexWordLo( 5 )];
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extSigZ[indexWordLo( 5 )] = -wordSigZ;
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carry = ! wordSigZ;
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}
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carry =
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(*addCarryMRoutinePtr)(
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3,
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&aWPtr[indexMultiwordLo( 4, 3 )],
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&extSigZ[indexMultiword( 5, 3, 1 )],
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carry,
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&extSigZ[indexMultiword( 5, 3, 1 )]
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);
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wordSigZ = sig96A + sig96B + carry;
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} else {
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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extSigZ[indexWordLo( 5 )] = 0;
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carry =
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(*addCarryMRoutinePtr)(
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3,
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&aWPtr[indexMultiwordLo( 4, 3 )],
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&bWPtr[indexMultiwordLo( 4, 3 )],
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negateB,
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&extSigZ[indexMultiword( 5, 3, 1 )]
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);
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if ( negateB ) {
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wordSigZ = sig96A + ~sig96B + carry;
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if ( wordSigZ & 0x80000000 ) {
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signZ = ! signZ;
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carry =
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softfloat_addComplCarry96M(
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&bWPtr[indexMultiwordLo( 4, 3 )],
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&aWPtr[indexMultiwordLo( 4, 3 )],
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1,
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&extSigZ[indexMultiword( 5, 3, 1 )]
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);
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wordSigZ = sig96B + ~sig96A + carry;
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} else {
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if (
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! wordSigZ && ! extSigZ[indexWord( 5, 3 )]
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&& ! ( extSigZ[indexWord( 5, 2 )]
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| extSigZ[indexWord( 5, 1 )]
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| extSigZ[indexWord( 5, 0 )]
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)
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) {
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signZ = (softfloat_roundingMode == softfloat_round_min);
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zWPtr[indexWordHi( 4 )] = packToF128UI96( signZ, 0, 0 );
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zWPtr[indexWord( 4, 2 )] = 0;
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zWPtr[indexWord( 4, 1 )] = 0;
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zWPtr[indexWord( 4, 0 )] = 0;
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return;
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}
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}
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} else {
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wordSigZ = sig96A + sig96B + carry;
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}
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}
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extSigZ[indexWordHi( 5 )] = wordSigZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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roundPackRoutinePtr = softfloat_normRoundPackMToF128M;
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if ( 0x00010000 <= wordSigZ ) {
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if ( 0x00020000 <= wordSigZ ) {
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++expA;
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softfloat_shortShiftRightJam160M( extSigZ, 1, extSigZ );
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}
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roundPackRoutinePtr = softfloat_roundPackMToF128M;
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}
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(*roundPackRoutinePtr)( signZ, expA, extSigZ, zWPtr );
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}
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