ABC: System for Sequential Logic Synthesis and Formal Verification

ABC is always changing but the current snapshot is believed to be stable.

Additional commands implemented by me (Yu-Cheng Wu):

cec -a netlist1.v netlist2.v

• Do CEC and generate all error patterns if two circuits are nonequivalent.
• All output files will be generated in the “cec_output” folder.
• Filename.txt stores all names of files storing error patterns.
• InputID.txt stores the relationship between inputs and patterns.
• 0>1(1>0) means that netlist1 prints 0(1) and netlist2 prints 1(0).

cec -b netlist1.v netlist2.v

• Do CEC and generate all error patterns for every PO
• Generate a patch(patch.v) for netlist1 and several subcircuits in 'cec_patch' folder.
  (Similar to Cadence LEC ECO.)
• Users can do synthesis and technology mapping on patch.v by Yosys command 'tcl patch.tcl'.
  (Using cell library - lib/typical.lib.)

Compiling:

To compile ABC as a binary, download and unzip the code, then type make. To compile ABC as a static library, type make libabc.a.

When ABC is used as a static library, two additional procedures, Abc_Start() and Abc_Stop(), are provided for starting and quitting the ABC framework in the calling application. A simple demo program (file src/demo.c) shows how to create a stand-alone program performing DAG-aware AIG rewriting, by calling APIs of ABC compiled as a static library.

To build the demo program

• Copy demo.c and libabc.a to the working directory
• Run gcc -Wall -g -c demo.c -o demo.o
• Run g++ -g -o demo demo.o libabc.a -lm -ldl -lreadline -lpthread

To run the demo program, give it a file with the logic network in AIGER or BLIF. For example:

[...] ~/abc> demo i10.aig
i10          : i/o =  257/  224  lat =    0  and =   2396  lev = 37
i10          : i/o =  257/  224  lat =    0  and =   1851  lev = 35
Networks are equivalent.
Reading =   0.00 sec   Rewriting =   0.18 sec   Verification =   0.41 sec

The same can be produced by running the binary in the command-line mode:

[...] ~/abc> ./abc
UC Berkeley, ABC 1.01 (compiled Oct  6 2012 19:05:18)
abc 01> r i10.aig; b; ps; b; rw -l; rw -lz; b; rw -lz; b; ps; cec
i10          : i/o =  257/  224  lat =    0  and =   2396  lev = 37
i10          : i/o =  257/  224  lat =    0  and =   1851  lev = 35
Networks are equivalent.

or in the batch mode:

[...] ~/abc> ./abc -c "r i10.aig; b; ps; b; rw -l; rw -lz; b; rw -lz; b; ps; cec"
ABC command line: "r i10.aig; b; ps; b; rw -l; rw -lz; b; rw -lz; b; ps; cec".
i10          : i/o =  257/  224  lat =    0  and =   2396  lev = 37
i10          : i/o =  257/  224  lat =    0  and =   1851  lev = 35
Networks are equivalent.

Compiling as C or C++

The current version of ABC can be compiled with C compiler or C++ compiler.

• To compile as C code (default): make sure that CC=gcc and ABC_NAMESPACE is not defined.
• To compile as C++ code without namespaces: make sure that CC=g++ and ABC_NAMESPACE is not defined.
• To compile as C++ code with namespaces: make sure that CC=g++ and ABC_NAMESPACE is set to the name of the requested namespace. For example, add -DABC_NAMESPACE=xxx to OPTFLAGS.

Building a shared library

• Compile the code as position-independent by adding ABC_USE_PIC=1.

• Build the libabc.so target:

  make ABC_USE_PIC=1 libabc.so

Bug reporting:

Please try to reproduce all the reported bugs and unexpected features using the latest version of ABC available from https://github.com/berkeley-abc/abc

If the bug still persists, please provide the following information:

1. ABC version (when it was downloaded from GitHub)
2. Linux distribution and version (32-bit or 64-bit)
3. The exact command line and error message when trying to run the tool
4. The output of the ldd command runs on the executable (e.g. ldd abc).
5. Versions of relevant tools or packages used.

Troubleshooting:

1. If compilation does not start because of the cyclic dependency check, try touching all files as follows: find ./ -type f -exec touch "{}" \;
2. If compilation fails because readline is missing, install 'readline' library or compile with make ABC_USE_NO_READLINE=1
3. If compilation fails because pthreads are missing, install 'pthread' library or compile with make ABC_USE_NO_PTHREADS=1
   • See http://sourceware.org/pthreads-win32/ for pthreads on Windows
   • Precompiled DLLs are available from ftp://sourceware.org/pub/pthreads-win32/dll-latest
4. If compilation fails in the file "src/base/main/libSupport.c", try the following:
   • Remove "src/base/main/libSupport.c" from "src/base/main/module.make"
   • Comment out calls to Libs_Init() and Libs_End() in "src/base/main/mainInit.c"
5. On some systems, readline requires adding '-lcurses' to Makefile.

The following comment was added by Krish Sundaresan:

"I found that the code does compile correctly on Solaris if gcc is used (instead of g++ I was using for some reason). Also, readline which is not available by default on most Sol10 systems, needs to be installed. I downloaded the readline-5.2 package from sunfreeware.com and installed it locally. Also modified CFLAGS to add the local include files for readline and LIBS to add the local libreadline.a. Perhaps you can add these steps in the readme to help folks compile this on Solaris."

The following tutorial is kindly offered by Ana Petkovska from EPFL: https://www.dropbox.com/s/qrl9svlf0ylxy8p/ABC_GettingStarted.pdf

Final remarks:

Unfortunately, there is no comprehensive regression test. Good luck!

This system is maintained by Alan Mishchenko [email protected]. Consider also using ZZ framework developed by Niklas Een: https://bitbucket.org/niklaseen/abc-zz (or https://github.com/berkeley-abc/abc-zz)

1. Do CEC and generate all error patterns for every PO

2. Generate a patch(patch.v) for netlist1 and several subcircuits in 'cec_patch' folder. (Similar to Cadence LEC ECO)

3. Users can do synthesis and technology mapping on patch.v by Yosys command 'tcl patch.tcl'. (Using cell library - lib/typical.lib)