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#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "primitives.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"
float32_t
softfloat_mulAddF32(
int op, uint_fast32_t uiA, uint_fast32_t uiB, uint_fast32_t uiC )
{
bool signA;
int_fast16_t expA;
uint_fast32_t sigA;
bool signB;
int_fast16_t expB;
uint_fast32_t sigB;
bool signC;
int_fast16_t expC;
uint_fast32_t sigC;
bool signProd;
uint_fast32_t magBits, uiZ;
struct exp16_sig32 normExpSig;
int_fast16_t expProd;
uint_fast64_t sigProd;
bool signZ;
int_fast16_t expZ;
uint_fast32_t sigZ;
int_fast16_t expDiff;
uint_fast64_t sigZ64, sigC64;
int shiftCount;
union ui32_f32 uZ;
signA = signF32UI( uiA );
expA = expF32UI( uiA );
sigA = fracF32UI( uiA );
signB = signF32UI( uiB );
expB = expF32UI( uiB );
sigB = fracF32UI( uiB );
signC = signF32UI( uiC ) ^ ( op == softfloat_mulAdd_subC );
expC = expF32UI( uiC );
sigC = fracF32UI( uiC );
signProd = signA ^ signB ^ ( op == softfloat_mulAdd_subProd );
if ( expA == 0xFF ) {
if ( sigA || ( ( expB == 0xFF ) && sigB ) ) goto propagateNaN_ABC;
magBits = expB | sigB;
goto infProdArg;
}
if ( expB == 0xFF ) {
if ( sigB ) goto propagateNaN_ABC;
magBits = expA | sigA;
goto infProdArg;
}
if ( expC == 0xFF ) {
if ( sigC ) {
uiZ = 0;
goto propagateNaN_ZC;
}
uiZ = uiC;
goto uiZ;
}
if ( ! expA ) {
if ( ! sigA ) goto zeroProd;
normExpSig = softfloat_normSubnormalF32Sig( sigA );
expA = normExpSig.exp;
sigA = normExpSig.sig;
}
if ( ! expB ) {
if ( ! sigB ) goto zeroProd;
normExpSig = softfloat_normSubnormalF32Sig( sigB );
expB = normExpSig.exp;
sigB = normExpSig.sig;
}
expProd = expA + expB - 0x7E;
sigA = ( sigA | 0x00800000 )<<7;
sigB = ( sigB | 0x00800000 )<<7;
sigProd = (uint_fast64_t) sigA * sigB;
if ( sigProd < UINT64_C( 0x2000000000000000 ) ) {
--expProd;
sigProd <<= 1;
}
signZ = signProd;
if ( ! expC ) {
if ( ! sigC ) {
expZ = expProd - 1;
sigZ = softfloat_shortShift64RightJam( sigProd, 31 );
goto roundPack;
}
normExpSig = softfloat_normSubnormalF32Sig( sigC );
expC = normExpSig.exp;
sigC = normExpSig.sig;
}
sigC = ( sigC | 0x00800000 )<<6;
expDiff = expProd - expC;
if ( signProd == signC ) {
if ( expDiff <= 0 ) {
expZ = expC;
sigZ = sigC + softfloat_shift64RightJam( sigProd, 32 - expDiff );
} else {
expZ = expProd;
sigZ64 =
sigProd
+ softfloat_shift64RightJam(
(uint_fast64_t) sigC<<32, expDiff );
sigZ = softfloat_shortShift64RightJam( sigZ64, 32 );
}
if ( sigZ < 0x40000000 ) {
--expZ;
sigZ <<= 1;
}
} else {
/*** OPTIMIZE BETTER? ***/
sigC64 = (uint_fast64_t) sigC<<32;
if ( expDiff < 0 ) {
signZ = signC;
expZ = expC;
sigZ64 = sigC64 - softfloat_shift64RightJam( sigProd, - expDiff );
} else if ( ! expDiff ) {
expZ = expProd;
sigZ64 = sigProd - sigC64;
if ( ! sigZ64 ) goto completeCancellation;
if ( sigZ64 & UINT64_C( 0x8000000000000000 ) ) {
signZ ^= 1;
sigZ64 = - sigZ64;
}
} else {
expZ = expProd;
sigZ64 = sigProd - softfloat_shift64RightJam( sigC64, expDiff );
}
shiftCount = softfloat_countLeadingZeros64( sigZ64 ) - 1;
expZ -= shiftCount;
shiftCount -= 32;
if ( shiftCount < 0 ) {
sigZ = softfloat_shortShift64RightJam( sigZ64, - shiftCount );
} else {
sigZ = (uint_fast32_t) sigZ64<<shiftCount;
}
}
roundPack:
return softfloat_roundPackToF32( signZ, expZ, sigZ );
propagateNaN_ABC:
uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
goto propagateNaN_ZC;
infProdArg:
if ( magBits ) {
uiZ = packToF32UI( signProd, 0xFF, 0 );
if ( expC != 0xFF ) goto uiZ;
if ( sigC ) goto propagateNaN_ZC;
if ( signProd == signC ) goto uiZ;
}
invalid:
softfloat_raiseFlags( softfloat_flag_invalid );
uiZ = defaultNaNF32UI;
propagateNaN_ZC:
uiZ = softfloat_propagateNaNF32UI( uiZ, uiC );
goto uiZ;
zeroProd:
uiZ = uiC;
if ( ! ( expC | sigC ) && ( signProd != signC ) ) {
completeCancellation:
uiZ =
packToF32UI( softfloat_roundingMode == softfloat_round_min, 0, 0 );
}
uiZ:
uZ.ui = uiZ;
return uZ.f;
}
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