mirror of https://github.com/YosysHQ/yosys.git
578 lines
23 KiB
Plaintext
578 lines
23 KiB
Plaintext
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List of major changes and improvements between releases
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=======================================================
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Yosys 0.7 .. Yosys ??? (2017-12-12)
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----------------------
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* Various
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- Many bugfixes and small improvements
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- Added write_verilog hex dump support, add -nohex option
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- Added "write_verilog -decimal"
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- Added "scc -set_attr"
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- Added "verilog_defines" command
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- Remeber defines from one read_verilog to next
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- Added support for hierarchical defparam
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- Added FIRRTL back-end
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- Improved ABC default scripts
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- Added "design -reset-vlog"
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- Added "yosys -W regex" and "yosys -w regex"
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- Added Verilog $rtoi and $itor support
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- Added "check -initdrv"
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- Added "read_blif -wideports"
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- Added support for systemVerilog "++" and "--" operators
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- Added support for SystemVerilog unique, unique0, and priority case
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- Added "write_edif" options for edif "flavors"
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- Added support for resetall compiler directive
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- Added simple C beck-end (bitwise combinatorical only atm)
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- Added $_ANDNOT_ and $_ORNOT_ cell types
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- Added cell library aliases to "abc -g"
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- Added "setundef -anyseq"
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- Added "chtype" command
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- Added "design -import"
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- Added "write_table" command
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- Added "read_json" command
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- Added "sim" command
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- Added "extract_fa" and "extract_reduce" commands
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- Added "extract_counter" command
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- Added "opt_demorgan" command
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- Added support for $size and $bits SystemVerilog functions
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- Added "blackbox" command
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- Added "ltp" command
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- Added support for editline as replacement for readline
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- Added warnings for driver-driver conflicts between FFs (and other cells) and constants
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* Changes in Yosys APIs
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- Added ConstEval defaultval feature
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- Added {get,set}_src_attribute() methods on RTLIL::AttrObject
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* Formal Verification
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- Added "write_aiger"
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- Added "yosys-smtbmc --aig"
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- Added "always <positive_int>" to .smtc format
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- Added $cover cell type and support for cover properties
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- Added $fair/$live cell type and support for liveness properties
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- Added smtbmc support for memory vcd dumping
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- Added "chformal" command
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- Added "write_smt2 -stbv" and "write_smt2 -stdt"
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- Fix equiv_simple, old behavior now available with "equiv_simple -short"
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- Change to Yices2 as default SMT solver (it is GPL now)
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- Added "yosys-smtbmc --presat" (now default in SymbiYosys)
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- Added "yosys-smtbmc --smtc-init --smtc-top --noinit"
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- Added a brand new "write_btor" command for BTOR2
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* Verific support
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- Many improvements in Verific front-end
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- Added proper handling of concurent SVA properties
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- Map "const" and "rand const" to $anyseq/$anyconst
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- Added "verific -import -flatten" and "verific -import -extnets"
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- Added "verific -vlog-incdir -vlog-define -vlog-libdir"
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- Remove PSL support (because PSL has been removed in upstream Verific)
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* New back-ends
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- Added initial Coolrunner-II support
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- Added initial eASIC support
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* GreenPAK Support
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- Added support for GP_DLATCH, GP_SPI, GP_DCMx, GP_COUNTx, etc.
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* iCE40 Support
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- Add "synth_ice40 -vpr"
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- Add Support for UltraPlus cells
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* MAX10 and Cyclone IV Support
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- Added initial version of metacommand "synth_intel".
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- Improved write_verilog command to produce VQM netlist for Quartus Prime.
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- Added support for MAX10 FPGA family synthesis.
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- Added support for Cyclone IV family synthesis.
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- Added example of implementation for DE2i-150 board.
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- Added example of implementation for MAX10 development kit.
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- Added LFSR example from Asic World.
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Yosys 0.6 .. Yosys 0.7
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----------------------
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* Various
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- Added "yosys -D" feature
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- Added support for installed plugins in $(DATDIR)/plugins/
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- Renamed opt_const to opt_expr
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- Renamed opt_share to opt_merge
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- Added "prep -flatten" and "synth -flatten"
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- Added "prep -auto-top" and "synth -auto-top"
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- Using "mfs" and "lutpack" in ABC lut mapping
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- Support for abstract modules in chparam
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- Cleanup abstract modules at end of "hierarchy -top"
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- Added tristate buffer support to iopadmap
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- Added opt_expr support for div/mod by power-of-two
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- Added "select -assert-min <N> -assert-max <N>"
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- Added "attrmvcp" pass
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- Added "attrmap" command
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- Added "tee +INT -INT"
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- Added "zinit" pass
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- Added "setparam -type"
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- Added "shregmap" pass
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- Added "setundef -init"
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- Added "nlutmap -assert"
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- Added $sop cell type and "abc -sop -I <num> -P <num>"
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- Added "dc2" to default ABC scripts
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- Added "deminout"
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- Added "insbuf" command
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- Added "prep -nomem"
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- Added "opt_rmdff -keepdc"
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- Added "prep -nokeepdc"
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- Added initial version of "synth_gowin"
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- Added "fsm_expand -full"
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- Added support for fsm_encoding="user"
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- Many improvements in GreenPAK4 support
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- Added black box modules for all Xilinx 7-series lib cells
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- Added synth_ice40 support for latches via logic loops
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- Fixed ice40_opt lut unmapping, added "ice40_opt -unlut"
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* Build System
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- Added ABCEXTERNAL and ABCURL make variables
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- Added BINDIR, LIBDIR, and DATDIR make variables
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- Added PKG_CONFIG make variable
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- Added SEED make variable (for "make test")
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- Added YOSYS_VER_STR make variable
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- Updated min GCC requirement to GCC 4.8
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- Updated required Bison version to Bison 3.x
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* Internal APIs
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- Added ast.h to exported headers
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- Added ScriptPass helper class for script-like passes
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- Added CellEdgesDatabase API
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* Front-ends and Back-ends
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- Added filename glob support to all front-ends
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- Added avail (black-box) module params to ilang format
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- Added $display %m support
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- Added support for $stop Verilog system task
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- Added support for SystemVerilog packages
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- Fixed procedural assignments to non-unique lvalues, e.g. {y,y} = {a,b}
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- Added support for "active high" and "active low" latches in read_blif and write_blif
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- Use init value "2" for all uninitialized FFs in BLIF back-end
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- Added "read_blif -sop"
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- Added "write_blif -noalias"
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- Added various write_blif options for VTR support
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- write_json: also write module attributes.
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- Added "write_verilog -nodec -nostr -defparam"
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- Added "read_verilog -norestrict -assume-asserts"
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- Added support for bus interfaces to "read_liberty -lib"
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- Added liberty parser support for types within cell decls
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- Added "write_verilog -renameprefix -v"
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- Added "write_edif -nogndvcc"
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* Formal Verification
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- Support for hierarchical designs in smt2 back-end
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- Yosys-smtbmc: Support for hierarchical VCD dumping
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- Added $initstate cell type and vlog function
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- Added $anyconst and $anyseq cell types and vlog functions
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- Added printing of code loc of failed asserts to yosys-smtbmc
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- Added memory_memx pass, "memory -memx", and "prep -memx"
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- Added "proc_mux -ifx"
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- Added "yosys-smtbmc -g"
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- Deprecated "write_smt2 -regs" (by default on now)
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- Made "write_smt2 -bv -mem" default, added "write_smt2 -nobv -nomem"
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- Added support for memories to smtio.py
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- Added "yosys-smtbmc --dump-vlogtb"
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- Added "yosys-smtbmc --smtc --dump-smtc"
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- Added "yosys-smtbmc --dump-all"
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- Added assertpmux command
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- Added "yosys-smtbmc --unroll"
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- Added $past, $stable, $rose, $fell SVA functions
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- Added "yosys-smtbmc --noinfo and --dummy"
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- Added "yosys-smtbmc --noincr"
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- Added "yosys-smtbmc --cex <filename>"
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- Added $ff and $_FF_ cell types
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- Added $global_clock verilog syntax support for creating $ff cells
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- Added clk2fflogic
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Yosys 0.5 .. Yosys 0.6
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----------------------
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* Various
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- Added Contributor Covenant Code of Conduct
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- Various improvements in dict<> and pool<>
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- Added hashlib::mfp and refactored SigMap
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- Improved support for reals as module parameters
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- Various improvements in SMT2 back-end
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- Added "keep_hierarchy" attribute
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- Verilog front-end: define `BLACKBOX in -lib mode
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- Added API for converting internal cells to AIGs
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- Added ENABLE_LIBYOSYS Makefile option
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- Removed "techmap -share_map" (use "-map +/filename" instead)
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- Switched all Python scripts to Python 3
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- Added support for $display()/$write() and $finish() to Verilog front-end
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- Added "yosys-smtbmc" formal verification flow
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- Added options for clang sanitizers to Makefile
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* New commands and options
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- Added "scc -expect <N> -nofeedback"
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- Added "proc_dlatch"
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- Added "check"
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- Added "select %xe %cie %coe %M %C %R"
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- Added "sat -dump_json" (WaveJSON format)
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- Added "sat -tempinduct-baseonly -tempinduct-inductonly"
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- Added "sat -stepsize" and "sat -tempinduct-step"
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- Added "sat -show-regs -show-public -show-all"
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- Added "write_json" (Native Yosys JSON format)
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- Added "write_blif -attr"
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- Added "dffinit"
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- Added "chparam"
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- Added "muxcover"
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- Added "pmuxtree"
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- Added memory_bram "make_outreg" feature
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- Added "splice -wires"
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- Added "dff2dffe -direct-match"
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- Added simplemap $lut support
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- Added "read_blif"
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- Added "opt_share -share_all"
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- Added "aigmap"
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- Added "write_smt2 -mem -regs -wires"
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- Added "memory -nordff"
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- Added "write_smv"
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- Added "synth -nordff -noalumacc"
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- Added "rename -top new_name"
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- Added "opt_const -clkinv"
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- Added "synth -nofsm"
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- Added "miter -assert"
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- Added "read_verilog -noautowire"
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- Added "read_verilog -nodpi"
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- Added "tribuf"
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- Added "lut2mux"
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- Added "nlutmap"
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- Added "qwp"
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- Added "test_cell -noeval"
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- Added "edgetypes"
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- Added "equiv_struct"
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- Added "equiv_purge"
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- Added "equiv_mark"
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- Added "equiv_add -try -cell"
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- Added "singleton"
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- Added "abc -g -luts"
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- Added "torder"
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- Added "write_blif -cname"
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- Added "submod -copy"
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- Added "dffsr2dff"
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- Added "stat -liberty"
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* Synthesis metacommands
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- Various improvements in synth_xilinx
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- Added synth_ice40 and synth_greenpak4
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- Added "prep" metacommand for "synthesis lite"
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* Cell library changes
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- Added cell types to "help" system
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- Added $meminit cell type
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- Added $assume cell type
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- Added $_MUX4_, $_MUX8_, and $_MUX16_ cells
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- Added $tribuf and $_TBUF_ cell types
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- Added read-enable to memory model
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* YosysJS
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- Various improvements in emscripten build
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- Added alternative webworker-based JS API
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- Added a few example applications
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Yosys 0.4 .. Yosys 0.5
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----------------------
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* API changes
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- Added log_warning()
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- Added eval_select_args() and eval_select_op()
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- Added cell->known(), cell->input(portname), cell->output(portname)
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- Skip blackbox modules in design->selected_modules()
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- Replaced std::map<> and std::set<> with dict<> and pool<>
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- New SigSpec::extend() is what used to be SigSpec::extend_u0()
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- Added YS_OVERRIDE, YS_FINAL, YS_ATTRIBUTE, YS_NORETURN
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* Cell library changes
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- Added flip-flops with enable ($dffe etc.)
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- Added $equiv cells for equivalence checking framework
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* Various
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- Updated ABC to hg rev 61ad5f908c03
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- Added clock domain partitioning to ABC pass
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- Improved plugin building (see "yosys-config --build")
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- Added ENABLE_NDEBUG Makefile flag for high-performance builds
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- Added "yosys -d", "yosys -L" and other driver improvements
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- Added support for multi-bit (array) cell ports to "write_edif"
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- Now printing most output to stdout, not stderr
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- Added "onehot" attribute (set by "fsm_map")
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- Various performance improvements
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- Vastly improved Xilinx flow
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- Added "make unsintall"
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* Equivalence checking
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- Added equivalence checking commands:
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equiv_make equiv_simple equiv_status
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equiv_induct equiv_miter
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equiv_add equiv_remove
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* Block RAM support:
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- Added "memory_bram" command
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- Added BRAM support to Xilinx flow
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* Other New Commands and Options
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- Added "dff2dffe"
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- Added "fsm -encfile"
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- Added "dfflibmap -prepare"
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- Added "write_blid -unbuf -undef -blackbox"
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- Added "write_smt2" for writing SMT-LIBv2 files
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- Added "test_cell -w -muxdiv"
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- Added "select -read"
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Yosys 0.3.0 .. Yosys 0.4
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------------------------
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* Platform Support
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- Added support for mxe-based cross-builds for win32
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- Added sourcecode-export as VisualStudio project
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- Added experimental EMCC (JavaScript) support
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* Verilog Frontend
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- Added -sv option for SystemVerilog (and automatic *.sv file support)
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- Added support for real-valued constants and constant expressions
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- Added support for non-standard "via_celltype" attribute on task/func
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- Added support for non-standard "module mod_name(...);" syntax
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- Added support for non-standard """ macro bodies
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- Added support for array with more than one dimension
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- Added support for $readmemh and $readmemb
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- Added support for DPI functions
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* Changes in internal cell library
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- Added $shift and $shiftx cell types
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- Added $alu, $lcu, $fa and $macc cell types
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- Removed $bu0 and $safe_pmux cell types
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- $mem/$memwr WR_EN input is now a per-data-bit enable signal
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- Added $_NAND_ $_NOR_ $_XNOR_ $_AOI3_ $_OAI3_ $_AOI4_ $_OAI4_
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- Renamed ports of $lut cells (from I->O to A->Y)
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- Renamed $_INV_ to $_NOT_
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* Changes for simple synthesis flows
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- There is now a "synth" command with a recommended default script
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- Many improvements in synthesis of arithmetic functions to gates
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- Multipliers and adders with many operands are using carry-save adder trees
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- Remaining adders are now implemented using Brent-Kung carry look-ahead adders
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- Various new high-level optimizations on RTL netlist
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- Various improvements in FSM optimization
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- Updated ABC to hg 5b5af75f1dda (from 2014-11-07)
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* Changes in internal APIs and RTLIL
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- Added log_id() and log_cell() helper functions
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- Added function-like cell creation helpers
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- Added GetSize() function (like .size() but with int)
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- Major refactoring of RTLIL::Module and related classes
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- Major refactoring of RTLIL::SigSpec and related classes
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- Now RTLIL::IdString is essentially an int
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- Added macros for code coverage counters
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- Added some Makefile magic for pretty make logs
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- Added "kernel/yosys.h" with all the core definitions
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- Changed a lot of code from FILE* to c++ streams
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- Added RTLIL::Monitor API and "trace" command
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- Added "Yosys" C++ namespace
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* Changes relevant to SAT solving
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- Added ezSAT::keep_cnf() and ezSAT::non_incremental()
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- Added native ezSAT support for vector shift ops
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- Updated MiniSAT to git 37dc6c67e2 (from 2013-09-25)
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* New commands (or large improvements to commands)
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- Added "synth" command with default script
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- Added "share" (finally some real resource sharing)
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- Added "memory_share" (reduce number of ports on memories)
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- Added "wreduce" and "alumacc" commands
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- Added "opt -keepdc -fine -full -fast"
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- Added some "test_*" commands
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* Various other changes
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- Added %D and %c select operators
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- Added support for labels in yosys scripts
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- Added support for here-documents in yosys scripts
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- Support "+/" prefix for files from proc_share_dir
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- Added "autoidx" statement to ilang language
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- Switched from "yosys-svgviewer" to "xdot"
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- Renamed "stdcells.v" to "techmap.v"
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- Various bug fixes and small improvements
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- Improved welcome and bye messages
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Yosys 0.2.0 .. Yosys 0.3.0
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--------------------------
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* Driver program and overall behavior:
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- Added "design -push" and "design -pop"
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- Added "tee" command for redirecting log output
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* Changes in the internal cell library:
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- Added $dlatchsr and $_DLATCHSR_???_ cell types
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* Improvements in Verilog frontend:
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- Improved support for const functions (case, always, repeat)
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- The generate..endgenerate keywords are now optional
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- Added support for arrays of module instances
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- Added support for "`default_nettype" directive
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- Added support for "`line" directive
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* Other front- and back-ends:
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- Various changes to "write_blif" options
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- Various improvements in EDIF backend
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- Added "vhdl2verilog" pseudo-front-end
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- Added "verific" pseudo-front-end
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* Improvements in technology mapping:
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- Added support for recursive techmap
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- Added CONSTMSK and CONSTVAL features to techmap
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- Added _TECHMAP_CONNMAP_*_ feature to techmap
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- Added _TECHMAP_REPLACE_ feature to techmap
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- Added "connwrappers" command for wrap-extract-unwrap method
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- Added "extract -map %<design_name>" feature
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- Added "extract -ignore_param ..." and "extract -ignore_parameters"
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- Added "techmap -max_iter" option
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* Improvements to "eval" and "sat" framework:
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- Now include a copy of Minisat (with build fixes applied)
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- Switched to Minisat::SimpSolver as SAT back-end
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- Added "sat -dump_vcd" feature
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- Added "sat -dump_cnf" feature
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- Added "sat -initsteps <N>" feature
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- Added "freduce -stop <N>" feature
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- Added "freduce -dump <prefix>" feature
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* Integration with ABC:
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- Updated ABC rev to 7600ffb9340c
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* Improvements in the internal APIs:
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- Added RTLIL::Module::add... helper methods
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- Various build fixes for OSX (Darwin) and OpenBSD
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Yosys 0.1.0 .. Yosys 0.2.0
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--------------------------
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* Changes to the driver program:
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- Added "yosys -h" and "yosys -H"
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- Added support for backslash line continuation in scripts
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- Added support for #-comments in same line as command
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- Added "echo" and "log" commands
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* Improvements in Verilog frontend:
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- Added support for local registers in named blocks
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- Added support for "case" in "generate" blocks
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- Added support for $clog2 system function
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- Added support for basic SystemVerilog assert statements
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- Added preprocessor support for macro arguments
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- Added preprocessor support for `elsif statement
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- Added "verilog_defaults" command
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- Added read_verilog -icells option
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- Added support for constant sizes from parameters
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- Added "read_verilog -setattr"
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- Added support for function returning 'integer'
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- Added limited support for function calls in parameter values
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- Added "read_verilog -defer" to suppress evaluation of modules with default parameters
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* Other front- and back-ends:
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- Added BTOR backend
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- Added Liberty frontend
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* Improvements in technology mapping:
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- The "dfflibmap" command now strongly prefers solutions with
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no inverters in clock paths
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- The "dfflibmap" command now prefers cells with smaller area
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- Added support for multiple -map options to techmap
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- Added "dfflibmap" support for //-comments in liberty files
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- Added "memory_unpack" command to revert "memory_collect"
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- Added standard techmap rule "techmap -share_map pmux2mux.v"
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- Added "iopadmap -bits"
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- Added "setundef" command
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- Added "hilomap" command
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* Changes in the internal cell library:
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- Major rewrite of simlib.v for better compatibility with other tools
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- Added PRIORITY parameter to $memwr cells
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- Added TRANSPARENT parameter to $memrd cells
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- Added RD_TRANSPARENT parameter to $mem cells
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- Added $bu0 cell (always 0-extend, even undef MSB)
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- Added $assert cell type
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- Added $slice and $concat cell types
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* Integration with ABC:
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- Updated ABC to hg rev 2058c8ccea68
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- Tighter integration of ABC build with Yosys build. The make
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targets 'make abc' and 'make install-abc' are now obsolete.
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- Added support for passing FFs from one clock domain through ABC
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- Now always use BLIF as exchange format with ABC
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- Added support for "abc -script +<command_sequence>"
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- Improved standard ABC recipe
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- Added support for "keep" attribute to abc command
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- Added "abc -dff / -clk / -keepff" options
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* Improvements to "eval" and "sat" framework:
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- Added support for "0" and "~0" in right-hand side -set expressions
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- Added "eval -set-undef" and "eval -table"
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- Added "sat -set-init" and "sat -set-init-*" for sequential problems
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- Added undef support to SAT solver, incl. various new "sat" options
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- Added correct support for === and !== for "eval" and "sat"
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- Added "sat -tempinduct" (default -seq is now non-induction sequential)
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- Added "sat -prove-asserts"
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- Complete rewrite of the 'freduce' command
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- Added "miter" command
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- Added "sat -show-inputs" and "sat -show-outputs"
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- Added "sat -ignore_unknown_cells" (now produce an error by default)
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- Added "sat -falsify"
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- Now "sat -verify" and "sat -falsify" can also be used without "-prove"
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- Added "expose" command
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- Added support for @<sel_name> to sat and eval signal expressions
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* Changes in the 'make test' framework and auxiliary test tools:
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- Added autotest.sh -p and -f options
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- Replaced autotest.sh ISIM support with XSIM support
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- Added test cases for SAT framework
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* Added "abbreviated IDs":
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- Now $<something>$foo can be abbreviated as $foo.
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- Usually this last part is a unique id (from RTLIL::autoidx)
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- This abbreviated IDs are now also used in "show" output
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* Other changes to selection framework:
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- Now */ is optional in */<mode>:<arg> expressions
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- Added "select -assert-none" and "select -assert-any"
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- Added support for matching modules by attribute (A:<expr>)
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- Added "select -none"
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- Added support for r:<expr> pattern for matching cell parameters
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- Added support for !=, <, <=, >=, > for attribute and parameter matching
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- Added support for %s for selecting sub-modules
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- Added support for %m for expanding selections to whole modules
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- Added support for i:*, o:* and x:* pattern for selecting module ports
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- Added support for s:<expr> pattern for matching wire width
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- Added support for %a operation to select wire aliases
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* Various other changes to commands and options:
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- The "ls" command now supports wildcards
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- Added "show -pause" and "show -format dot"
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- Added "show -color" support for cells
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- Added "show -label" and "show -notitle"
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- Added "dump -m" and "dump -n"
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- Added "history" command
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- Added "rename -hide"
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- Added "connect" command
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- Added "splitnets -driver"
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- Added "opt_const -mux_undef"
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- Added "opt_const -mux_bool"
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- Added "opt_const -undriven"
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- Added "opt -mux_undef -mux_bool -undriven -purge"
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- Added "hierarchy -libdir"
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- Added "hierarchy -purge_lib" (by default now do not remove lib cells)
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- Added "delete" command
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- Added "dump -append"
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- Added "setattr" and "setparam" commands
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- Added "design -stash/-copy-from/-copy-to"
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- Added "copy" command
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- Added "splice" command
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