List of major changes and improvements between releases ======================================================= Yosys 0.6 .. Yosys 0.7 ---------------------- * Various - Added "yosys -D" feature - Added support for installed plugins in $(DATDIR)/plugins/ - Renamed opt_const to opt_expr - Renamed opt_share to opt_merge - Added "prep -flatten" and "synth -flatten" - Added "prep -auto-top" and "synth -auto-top" - Using "mfs" and "lutpack" in ABC lut mapping - Support for abstract modules in chparam - Cleanup abstract modules at end of "hierarchy -top" - Added tristate buffer support to iopadmap - Added opt_expr support for div/mod by power-of-two - Added "select -assert-min -assert-max " - Added "attrmvcp" pass - Added "attrmap" command - Added "tee +INT -INT" - Added "zinit" pass - Added "setparam -type" - Added "shregmap" pass - Added "setundef -init" - Added "nlutmap -assert" - Added $sop cell type and "abc -sop -I -P " - Added "dc2" to default ABC scripts - Added "deminout" - Added "insbuf" command - Added "prep -nomem" - Added "opt_rmdff -keepdc" - Added "prep -nokeepdc" - Added initial version of "synth_gowin" - Added "fsm_expand -full" - Added support for fsm_encoding="user" - Many improvements in GreenPAK4 support - Added black box modules for all Xilinx 7-series lib cells - Added synth_ice40 support for latches via logic loops - Fixed ice40_opt lut unmapping, added "ice40_opt -unlut" * Build System - Added ABCEXTERNAL and ABCURL make variables - Added BINDIR, LIBDIR, and DATDIR make variables - Added PKG_CONFIG make variable - Added SEED make variable (for "make test") - Added YOSYS_VER_STR make variable - Updated min GCC requirement to GCC 4.8 - Updated required Bison version to Bison 3.x * Internal APIs - Added ast.h to exported headers - Added ScriptPass helper class for script-like passes - Added CellEdgesDatabase API * Front-ends and Back-ends - Added filename glob support to all front-ends - Added avail (black-box) module params to ilang format - Added $display %m support - Added support for $stop Verilog system task - Added support for SystemVerilog packages - Fixed procedural assignments to non-unique lvalues, e.g. {y,y} = {a,b} - Added support for "active high" and "active low" latches in read_blif and write_blif - Use init value "2" for all uninitialized FFs in BLIF back-end - Added "read_blif -sop" - Added "write_blif -noalias" - Added various write_blif options for VTR support - write_json: also write module attributes. - Added "write_verilog -nodec -nostr -defparam" - Added "read_verilog -norestrict -assume-asserts" - Added support for bus interfaces to "read_liberty -lib" - Added liberty parser support for types within cell decls - Added "write_verilog -renameprefix -v" - Added "write_edif -nogndvcc" * Formal Verification - Support for hierarchical designs in smt2 back-end - Yosys-smtbmc: Support for hierarchical VCD dumping - Added $initstate cell type and vlog function - Added $anyconst and $anyseq cell types and vlog functions - Added printing of code loc of failed asserts to yosys-smtbmc - Added memory_memx pass, "memory -memx", and "prep -memx" - Added "proc_mux -ifx" - Added "yosys-smtbmc -g" - Deprecated "write_smt2 -regs" (by default on now) - Made "write_smt2 -bv -mem" default, added "write_smt2 -nobv -nomem" - Added support for memories to smtio.py - Added "yosys-smtbmc --dump-vlogtb" - Added "yosys-smtbmc --smtc --dump-smtc" - Added "yosys-smtbmc --dump-all" - Added assertpmux command - Added "yosys-smtbmc --unroll" - Added $past, $stable, $rose, $fell SVA functions - Added "yosys-smtbmc --noinfo and --dummy" - Added "yosys-smtbmc --noincr" - Added "yosys-smtbmc --cex " - Added $ff and $_FF_ cell types - Added $global_clock verilog syntax support for creating $ff cells - Added clk2fflogic Yosys 0.5 .. Yosys 0.6 ---------------------- * Various - Added Contributor Covenant Code of Conduct - Various improvements in dict<> and pool<> - Added hashlib::mfp and refactored SigMap - Improved support for reals as module parameters - Various improvements in SMT2 back-end - Added "keep_hierarchy" attribute - Verilog front-end: define `BLACKBOX in -lib mode - Added API for converting internal cells to AIGs - Added ENABLE_LIBYOSYS Makefile option - Removed "techmap -share_map" (use "-map +/filename" instead) - Switched all Python scripts to Python 3 - Added support for $display()/$write() and $finish() to Verilog front-end - Added "yosys-smtbmc" formal verification flow - Added options for clang sanitizers to Makefile * New commands and options - Added "scc -expect -nofeedback" - Added "proc_dlatch" - Added "check" - Added "select %xe %cie %coe %M %C %R" - Added "sat -dump_json" (WaveJSON format) - Added "sat -tempinduct-baseonly -tempinduct-inductonly" - Added "sat -stepsize" and "sat -tempinduct-step" - Added "sat -show-regs -show-public -show-all" - Added "write_json" (Native Yosys JSON format) - Added "write_blif -attr" - Added "dffinit" - Added "chparam" - Added "muxcover" - Added "pmuxtree" - Added memory_bram "make_outreg" feature - Added "splice -wires" - Added "dff2dffe -direct-match" - Added simplemap $lut support - Added "read_blif" - Added "opt_share -share_all" - Added "aigmap" - Added "write_smt2 -mem -regs -wires" - Added "memory -nordff" - Added "write_smv" - Added "synth -nordff -noalumacc" - Added "rename -top new_name" - Added "opt_const -clkinv" - Added "synth -nofsm" - Added "miter -assert" - Added "read_verilog -noautowire" - Added "read_verilog -nodpi" - Added "tribuf" - Added "lut2mux" - Added "nlutmap" - Added "qwp" - Added "test_cell -noeval" - Added "edgetypes" - Added "equiv_struct" - Added "equiv_purge" - Added "equiv_mark" - Added "equiv_add -try -cell" - Added "singleton" - Added "abc -g -luts" - Added "torder" - Added "write_blif -cname" - Added "submod -copy" - Added "dffsr2dff" - Added "stat -liberty" * Synthesis metacommands - Various improvements in synth_xilinx - Added synth_ice40 and synth_greenpak4 - Added "prep" metacommand for "synthesis lite" * Cell library changes - Added cell types to "help" system - Added $meminit cell type - Added $assume cell type - Added $_MUX4_, $_MUX8_, and $_MUX16_ cells - Added $tribuf and $_TBUF_ cell types - Added read-enable to memory model * YosysJS - Various improvements in emscripten build - Added alternative webworker-based JS API - Added a few example applications Yosys 0.4 .. Yosys 0.5 ---------------------- * API changes - Added log_warning() - Added eval_select_args() and eval_select_op() - Added cell->known(), cell->input(portname), cell->output(portname) - Skip blackbox modules in design->selected_modules() - Replaced std::map<> and std::set<> with dict<> and pool<> - New SigSpec::extend() is what used to be SigSpec::extend_u0() - Added YS_OVERRIDE, YS_FINAL, YS_ATTRIBUTE, YS_NORETURN * Cell library changes - Added flip-flops with enable ($dffe etc.) - Added $equiv cells for equivalence checking framework * Various - Updated ABC to hg rev 61ad5f908c03 - Added clock domain partitioning to ABC pass - Improved plugin building (see "yosys-config --build") - Added ENABLE_NDEBUG Makefile flag for high-performance builds - Added "yosys -d", "yosys -L" and other driver improvements - Added support for multi-bit (array) cell ports to "write_edif" - Now printing most output to stdout, not stderr - Added "onehot" attribute (set by "fsm_map") - Various performance improvements - Vastly improved Xilinx flow - Added "make unsintall" * Equivalence checking - Added equivalence checking commands: equiv_make equiv_simple equiv_status equiv_induct equiv_miter equiv_add equiv_remove * Block RAM support: - Added "memory_bram" command - Added BRAM support to Xilinx flow * Other New Commands and Options - Added "dff2dffe" - Added "fsm -encfile" - Added "dfflibmap -prepare" - Added "write_blid -unbuf -undef -blackbox" - Added "write_smt2" for writing SMT-LIBv2 files - Added "test_cell -w -muxdiv" - Added "select -read" 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 - Multipliers 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 - Changed 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 %" 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 " feature - Added "freduce -stop " feature - Added "freduce -dump " 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 +" - 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 @ to sat and eval signal expressions * Changes in the 'make test' framework and auxiliary 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 $$foo can be abbreviated 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 */: expressions - Added "select -assert-none" and "select -assert-any" - Added support for matching modules by attribute (A:) - Added "select -none" - Added support for r: 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: 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