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Improving bit-blasting of full-adder.

This commit is contained in:
Alan Mishchenko 2015-09-23 16:04:06 -07:00
parent 19a4bb930e
commit a84c8174e7
3 changed files with 71 additions and 20 deletions
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43
src/base/abci/abcGen.c
View File

@ -43,19 +43,42 @@ ABC_NAMESPACE_IMPL_START
***********************************************************************/
void Abc_WriteFullAdder( FILE * pFile )
{
int fNaive = 0;
fprintf( pFile, ".model FA\n" );
fprintf( pFile, ".inputs a b cin\n" );
fprintf( pFile, ".outputs s cout\n" );
fprintf( pFile, ".names a b k\n" );
fprintf( pFile, "10 1\n" );
fprintf( pFile, "01 1\n" );
fprintf( pFile, ".names k cin s\n" );
fprintf( pFile, "10 1\n" );
fprintf( pFile, "01 1\n" );
fprintf( pFile, ".names a b cin cout\n" );
fprintf( pFile, "11- 1\n" );
fprintf( pFile, "1-1 1\n" );
fprintf( pFile, "-11 1\n" );
if ( fNaive )
{
fprintf( pFile, ".names a b k\n" );
fprintf( pFile, "10 1\n" );
fprintf( pFile, "01 1\n" );
fprintf( pFile, ".names k cin s\n" );
fprintf( pFile, "10 1\n" );
fprintf( pFile, "01 1\n" );
fprintf( pFile, ".names a b cin cout\n" );
fprintf( pFile, "11- 1\n" );
fprintf( pFile, "1-1 1\n" );
fprintf( pFile, "-11 1\n" );
}
else
{
fprintf( pFile, ".names a b and1\n" );
fprintf( pFile, "11 1\n" );
fprintf( pFile, ".names a b and1_\n" );
fprintf( pFile, "00 1\n" );
fprintf( pFile, ".names and1 and1_ xor\n" );
fprintf( pFile, "00 1\n" );
fprintf( pFile, ".names cin xor and2\n" );
fprintf( pFile, "11 1\n" );
fprintf( pFile, ".names cin xor and2_\n" );
fprintf( pFile, "00 1\n" );
fprintf( pFile, ".names and2 and2_ s\n" );
fprintf( pFile, "00 1\n" );
fprintf( pFile, ".names and1 and2 cout\n" );
fprintf( pFile, "00 0\n" );
}
fprintf( pFile, ".end\n" );
fprintf( pFile, "\n" );
}

24
src/base/cba/cbaBlast.c
View File

@ -295,11 +295,25 @@ int Cba_BlastLessSigned( Gia_Man_t * pNew, int * pArg0, int * pArg1, int nBits )
}
void Cba_BlastFullAdder( Gia_Man_t * pNew, int a, int b, int c, int * pc, int * ps )
{
int Xor = Gia_ManHashXor(pNew, a, b);
int And1 = Gia_ManHashAnd(pNew, a, b);
int And2 = Gia_ManHashAnd(pNew, c, Xor);
*ps = Gia_ManHashXor(pNew, c, Xor);
*pc = Gia_ManHashOr (pNew, And1, And2);
int fUseXor = 0;
if ( fUseXor )
{
int Xor = Gia_ManHashXor(pNew, a, b);
int And1 = Gia_ManHashAnd(pNew, a, b);
int And2 = Gia_ManHashAnd(pNew, c, Xor);
*ps = Gia_ManHashXor(pNew, c, Xor);
*pc = Gia_ManHashOr (pNew, And1, And2);
}
else
{
int And1 = Gia_ManHashAnd(pNew, a, b);
int And1_= Gia_ManHashAnd(pNew, Abc_LitNot(a), Abc_LitNot(b));
int Xor = Abc_LitNot(Gia_ManHashOr(pNew, And1, And1_));
int And2 = Gia_ManHashAnd(pNew, c, Xor);
int And2_= Gia_ManHashAnd(pNew, Abc_LitNot(c), Abc_LitNot(Xor));
*ps = Abc_LitNot(Gia_ManHashOr(pNew, And2, And2_));
*pc = Gia_ManHashOr (pNew, And1, And2);
}
}
int Cba_BlastAdder( Gia_Man_t * pNew, int Carry, int * pAdd0, int * pAdd1, int nBits ) // result is in pAdd0
{

24
src/base/wlc/wlcBlast.c
View File

@ -242,11 +242,25 @@ int Wlc_BlastLessSigned( Gia_Man_t * pNew, int * pArg0, int * pArg1, int nBits )
}
void Wlc_BlastFullAdder( Gia_Man_t * pNew, int a, int b, int c, int * pc, int * ps )
{
int Xor = Gia_ManHashXor(pNew, a, b);
int And1 = Gia_ManHashAnd(pNew, a, b);
int And2 = Gia_ManHashAnd(pNew, c, Xor);
*ps = Gia_ManHashXor(pNew, c, Xor);
*pc = Gia_ManHashOr (pNew, And1, And2);
int fUseXor = 0;
if ( fUseXor )
{
int Xor = Gia_ManHashXor(pNew, a, b);
int And1 = Gia_ManHashAnd(pNew, a, b);
int And2 = Gia_ManHashAnd(pNew, c, Xor);
*ps = Gia_ManHashXor(pNew, c, Xor);
*pc = Gia_ManHashOr (pNew, And1, And2);
}
else
{
int And1 = Gia_ManHashAnd(pNew, a, b);
int And1_= Gia_ManHashAnd(pNew, Abc_LitNot(a), Abc_LitNot(b));
int Xor = Abc_LitNot(Gia_ManHashOr(pNew, And1, And1_));
int And2 = Gia_ManHashAnd(pNew, c, Xor);
int And2_= Gia_ManHashAnd(pNew, Abc_LitNot(c), Abc_LitNot(Xor));
*ps = Abc_LitNot(Gia_ManHashOr(pNew, And2, And2_));
*pc = Gia_ManHashOr (pNew, And1, And2);
}
}
void Wlc_BlastAdder( Gia_Man_t * pNew, int * pAdd0, int * pAdd1, int nBits ) // result is in pAdd0
{