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List of major changes and improvements between releases
=======================================================
Yosys 0.4 .. Yosys 0.4+
-----------------------
... TBD ...
Yosys 0.3.0 .. Yosys 0.4
------------------------
* Platform Support
- Added support for mxe-based cross-builds for win32
- Added sourcecode-export as VisualStudio project
- Added experimental EMCC (JavaScript) support
* Verilog Frontend
- Added -sv option for SystemVerilog (and automatic *.sv file support)
- Added support for real-valued constants and constant expressions
- Added support for non-standard "via_celltype" attribute on task/func
- Added support for non-standard "module mod_name(...);" syntax
- Added support for non-standard """ macro bodies
- Added support for array with more than one dimension
- Added support for $readmemh and $readmemb
- Added support for DPI functions
* Changes in internal cell library
- Added $shift and $shiftx cell types
- Added $alu, $lcu, $fa and $macc cell types
- Removed $bu0 and $safe_pmux cell types
- $mem/$memwr WR_EN input is now a per-data-bit enable signal
- Added $_NAND_ $_NOR_ $_XNOR_ $_AOI3_ $_OAI3_ $_AOI4_ $_OAI4_
- Renamed ports of $lut cells (from I->O to A->Y)
- Renamed $_INV_ to $_NOT_
* Changes for simple synthesis flows
- There is now a "synth" command with a recommended default script
- Many improvements in synthesis of arithmetic functions to gates
- Multiplieres and adders with many operands are using carry-save adder trees
- Remaining adders are now implemented using Brent–Kung carry look-ahead adders
- Various new high-level optimizations on RTL netlist
- Various improvements in FSM optimization
- Updated ABC to hg 5b5af75f1dda (from 2014-11-07)
* Changes in internal APIs and RTLIL
- Added log_id() and log_cell() helper functions
- Added function-like cell creation helpers
- Added GetSize() function (like .size() but with int)
- Major refactoring of RTLIL::Module and related classes
- Major refactoring of RTLIL::SigSpec and related classes
- Now RTLIL::IdString is essentially an int
- Added macros for code coverage counters
- Added some Makefile magic for pretty make logs
- Added "kernel/yosys.h" with all the core definitions
- Chanded a lot of code from FILE* to c++ streams
- Added RTLIL::Monitor API and "trace" command
- Added "Yosys" C++ namespace
* Changes relevant to SAT solving
- Added ezSAT::keep_cnf() and ezSAT::non_incremental()
- Added native ezSAT support for vector shift ops
- Updated MiniSAT to git 37dc6c67e2 (from 2013-09-25)
* New commands (or large improvements to commands)
- Added "synth" command with default script
- Added "share" (finally some real resource sharing)
- Added "memory_share" (reduce number of ports on memories)
- Added "wreduce" and "alumacc" commands
- Added "opt -keepdc -fine -full -fast"
- Added some "test_*" commands
* Various other changes
- Added %D and %c select operators
- Added support for labels in yosys scripts
- Added support for here-documents in yosys scripts
- Support "+/" prefix for files from proc_share_dir
- Added "autoidx" statement to ilang language
- Switched from "yosys-svgviewer" to "xdot"
- Renamed "stdcells.v" to "techmap.v"
- Various bug fixes and small improvements
- Improved welcome and bye messages
Yosys 0.2.0 .. Yosys 0.3.0
--------------------------
* Driver program and overall behavior:
- Added "design -push" and "design -pop"
- Added "tee" command for redirecting log output
* Changes in the internal cell library:
- Added $dlatchsr and $_DLATCHSR_???_ cell types
* Improvements in Verilog frontend:
- Improved support for const functions (case, always, repeat)
- The generate..endgenerate keywords are now optional
- Added support for arrays of module instances
- Added support for "`default_nettype" directive
- Added support for "`line" directive
* Other front- and back-ends:
- Various changes to "write_blif" options
- Various improvements in EDIF backend
- Added "vhdl2verilog" pseudo-front-end
- Added "verific" pseudo-front-end
* Improvements in technology mapping:
- Added support for recursive techmap
- Added CONSTMSK and CONSTVAL features to techmap
- Added _TECHMAP_CONNMAP_*_ feature to techmap
- Added _TECHMAP_REPLACE_ feature to techmap
- Added "connwrappers" command for wrap-extract-unwrap method
- Added "extract -map %<design_name>" feature
- Added "extract -ignore_param ..." and "extract -ignore_parameters"
- Added "techmap -max_iter" option
* Improvements to "eval" and "sat" framework:
- Now include a copy of Minisat (with build fixes applied)
- Switched to Minisat::SimpSolver as SAT back-end
- Added "sat -dump_vcd" feature
- Added "sat -dump_cnf" feature
- Added "sat -initsteps <N>" feature
- Added "freduce -stop <N>" feature
- Added "fredure -dump <prefix>" feature
* Integration with ABC:
- Updated ABC rev to 7600ffb9340c
* Improvements in the internal APIs:
- Added RTLIL::Module::add... helper methods
- Various build fixes for OSX (Darwin) and OpenBSD
Yosys 0.1.0 .. Yosys 0.2.0
--------------------------
* Changes to the driver program:
- Added "yosys -h" and "yosys -H"
- Added support for backslash line continuation in scripts
- Added support for #-comments in same line as command
- Added "echo" and "log" commands
* Improvements in Verilog frontend:
- Added support for local registers in named blocks
- Added support for "case" in "generate" blocks
- Added support for $clog2 system function
- Added support for basic SystemVerilog assert statements
- Added preprocessor support for macro arguments
- Added preprocessor support for `elsif statement
- Added "verilog_defaults" command
- Added read_verilog -icells option
- Added support for constant sizes from parameters
- Added "read_verilog -setattr"
- Added support for function returning 'integer'
- Added limited support for function calls in parameter values
- Added "read_verilog -defer" to suppress evaluation of modules with default parameters
* Other front- and back-ends:
- Added BTOR backend
- Added Liberty frontend
* Improvements in technology mapping:
- The "dfflibmap" command now strongly prefers solutions with
no inverters in clock paths
- The "dfflibmap" command now prefers cells with smaller area
- Added support for multiple -map options to techmap
- Added "dfflibmap" support for //-comments in liberty files
- Added "memory_unpack" command to revert "memory_collect"
- Added standard techmap rule "techmap -share_map pmux2mux.v"
- Added "iopadmap -bits"
- Added "setundef" command
- Added "hilomap" command
* Changes in the internal cell library:
- Major rewrite of simlib.v for better compatibility with other tools
- Added PRIORITY parameter to $memwr cells
- Added TRANSPARENT parameter to $memrd cells
- Added RD_TRANSPARENT parameter to $mem cells
- Added $bu0 cell (always 0-extend, even undef MSB)
- Added $assert cell type
- Added $slice and $concat cell types
* Integration with ABC:
- Updated ABC to hg rev 2058c8ccea68
- Tighter integration of ABC build with Yosys build. The make
targets 'make abc' and 'make install-abc' are now obsolete.
- Added support for passing FFs from one clock domain through ABC
- Now always use BLIF as exchange format with ABC
- Added support for "abc -script +<command_sequence>"
- Improved standard ABC recipe
- Added support for "keep" attribute to abc command
- Added "abc -dff / -clk / -keepff" options
* Improvements to "eval" and "sat" framework:
- Added support for "0" and "~0" in right-hand side -set expressions
- Added "eval -set-undef" and "eval -table"
- Added "sat -set-init" and "sat -set-init-*" for sequential problems
- Added undef support to SAT solver, incl. various new "sat" options
- Added correct support for === and !== for "eval" and "sat"
- Added "sat -tempinduct" (default -seq is now non-induction sequential)
- Added "sat -prove-asserts"
- Complete rewrite of the 'freduce' command
- Added "miter" command
- Added "sat -show-inputs" and "sat -show-outputs"
- Added "sat -ignore_unknown_cells" (now produce an error by default)
- Added "sat -falsify"
- Now "sat -verify" and "sat -falsify" can also be used without "-prove"
- Added "expose" command
- Added support for @<sel_name> to sat and eval signal expressions
* Changes in the 'make test' framework and auxilary test tools:
- Added autotest.sh -p and -f options
- Replaced autotest.sh ISIM support with XSIM support
- Added test cases for SAT framework
* Added "abbreviated IDs":
- Now $<something>$foo can be abbriviated as $foo.
- Usually this last part is a unique id (from RTLIL::autoidx)
- This abbreviated IDs are now also used in "show" output
* Other changes to selection framework:
- Now */ is optional in */<mode>:<arg> expressions
- Added "select -assert-none" and "select -assert-any"
- Added support for matching modules by attribute (A:<expr>)
- Added "select -none"
- Added support for r:<expr> pattern for matching cell parameters
- Added support for !=, <, <=, >=, > for attribute and parameter matching
- Added support for %s for selecting sub-modules
- Added support for %m for expanding selections to whole modules
- Added support for i:*, o:* and x:* pattern for selecting module ports
- Added support for s:<expr> pattern for matching wire width
- Added support for %a operation to select wire aliases
* Various other changes to commands and options:
- The "ls" command now supports wildcards
- Added "show -pause" and "show -format dot"
- Added "show -color" support for cells
- Added "show -label" and "show -notitle"
- Added "dump -m" and "dump -n"
- Added "history" command
- Added "rename -hide"
- Added "connect" command
- Added "splitnets -driver"
- Added "opt_const -mux_undef"
- Added "opt_const -mux_bool"
- Added "opt_const -undriven"
- Added "opt -mux_undef -mux_bool -undriven -purge"
- Added "hierarchy -libdir"
- Added "hierarchy -purge_lib" (by default now do not remove lib cells)
- Added "delete" command
- Added "dump -append"
- Added "setattr" and "setparam" commands
- Added "design -stash/-copy-from/-copy-to"
- Added "copy" command
- Added "splice" command
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