s_addExtF80M.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"

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Functions
void	softfloat_addExtF80M (const struct extFloat80M *aSPtr, const struct extFloat80M *bSPtr, struct extFloat80M *zSPtr, bool negateB)

Function Documentation

softfloat_addExtF80M()

void softfloat_addExtF80M	(	const struct extFloat80M *	aSPtr,
		const struct extFloat80M *	bSPtr,
		struct extFloat80M *	zSPtr,
		bool	negateB )

Definition at line 45 of file s_addExtF80M.c.

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

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