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// See LICENSE.SoftFloat for license details.
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "primitives.h"
#include "internals.h"
#include "specialize.h"
float64_t
softfloat_addMagsF64( uint_fast64_t uiA, uint_fast64_t uiB, bool signZ )
{
int_fast16_t expA;
uint_fast64_t sigA;
int_fast16_t expB;
uint_fast64_t sigB;
int_fast16_t expDiff;
uint_fast64_t uiZ;
int_fast16_t expZ;
uint_fast64_t sigZ;
union ui64_f64 uZ;
expA = expF64UI( uiA );
sigA = fracF64UI( uiA );
expB = expF64UI( uiB );
sigB = fracF64UI( uiB );
expDiff = expA - expB;
sigA <<= 9;
sigB <<= 9;
if ( ! expDiff ) {
if ( expA == 0x7FF ) {
if ( sigA | sigB ) goto propagateNaN;
uiZ = uiA;
goto uiZ;
}
if ( ! expA ) {
uiZ =
packToF64UI(
signZ, 0, ( uiA + uiB ) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) );
goto uiZ;
}
expZ = expA;
sigZ = UINT64_C( 0x4000000000000000 ) + sigA + sigB;
} else {
if ( expDiff < 0 ) {
if ( expB == 0x7FF ) {
if ( sigB ) goto propagateNaN;
uiZ = packToF64UI( signZ, 0x7FF, 0 );
goto uiZ;
}
expZ = expB;
sigA += expA ? UINT64_C( 0x2000000000000000 ) : sigA;
sigA = softfloat_shift64RightJam( sigA, - expDiff );
} else {
if ( expA == 0x7FF ) {
if ( sigA ) goto propagateNaN;
uiZ = uiA;
goto uiZ;
}
expZ = expA;
sigB += expB ? UINT64_C( 0x2000000000000000 ) : sigB;
sigB = softfloat_shift64RightJam( sigB, expDiff );
}
sigZ = UINT64_C( 0x2000000000000000 ) + sigA + sigB;
if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
--expZ;
sigZ <<= 1;
}
}
return softfloat_roundPackToF64( signZ, expZ, sigZ );
propagateNaN:
uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
uiZ:
uZ.ui = uiZ;
return uZ.f;
}
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