sub128
sub128( aSig, 0, term0, term1, &rem0, &rem1 );
sub128( aSig, 0, term0, term1, &rem0, &rem1 );
sub128( bSig, 0, aSig, zSig1, &zSig0, &zSig1 );
sub128( aSig, 0, bSig, zSig1, &zSig0, &zSig1 );
sub128( aSig, rem1, term0, term1, &rem0, &rem1 );
sub128( rem1, 0, term1, term2, &rem1, &rem2 );
sub128( aSig0, aSig1, term0, term1, &aSig0, &aSig1 );
sub128( aSig0, aSig1, term0, term1, &aSig0, &aSig1 );
sub128( aSig0, aSig1, term0, term1, &aSig0, &aSig1 );
sub128( term0, term1, aSig0, aSig1, &alternateASig0, &alternateASig1 );
sub128( aSig0, aSig1, term0, term1, &rem0, &rem1 );
sub128( rem1, 0, term1, term2, &rem1, &rem2 );
sub128(&remh, &reml, nh, nl, termh, terml);
sub128(&remh, &reml, vdn.significand, 0, termh, terml);
sub128(&remh, &reml, vdm.significand, 0, termh, terml);
sub128(a0, a1, term0, term1, &rem0, &rem1);
sub128(aSig, 0, term0, term1, &rem0, &rem1);
void sub128(bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 * z0Ptr,