NEWS

NEWS for modelgen-verilog.

This file summarizes new features and important changes between snapshots.

2026****-dev
============
- conditionals, loops in digital blocks
- initial blocks
- various logic bugfixes

20260729-dev
============
- fix parameter initialisers in interpreted paramset
- localparam in spice and (interpreted) module
- overloading tie break: localparam range count
- fix href elaboration bug (codeberg issue #8)
- overloading at top level, now like module body
- fix: include port direction with verilog dumps
- lang_verilog: (re)enable backslash line continuation
- mgvams/$rdist: accept type_string arg
- generate code for always blocks
- pos/neg edge triggered events
- system tasks in always blocks
- reg, assign to reg in event block
- logic examples

20260329-dev
============
- hierarchical references to parameters
- fix param count bug in overload selection
- support common pooling (with C++>=20)
- string parameters
- fix dcop in $absdelay and $transition
- preprocessor fix. whitespace in string literals
- overloading diagnostics: use "desc" attribute
- generate code for variable initialiser expressions
- generate code for "net_assign"
- fopen, fclose, fwrite etc.
- final_step (without arg)

20251222-dev
============
- infer variable storage type (instance/common/temp)
- honour storage type in code generation
- improve annotation dumps
- add P_{K,Q}_NIST1998 to constants.vams
- add/test absdelay based transmission line
- fix lost context in parse error reporting
- fix a bunch of issues with const expressions
- fix "transition" 3-arg invocation

20250731-dev
============
- random distribution functions
- modularise functions and filters
- generate code for $rdist_* calls
- adjust precalc logic
- fix current control in idt/ddt
- simparam: "scale" and "simulatorVersion"
- follow various library improvements

20250525-dev
============
- improve overloading diagnostics
- fix paramset param_count bug
- codegen for same_port aka net devices
- add ceil, tangent functions, NaN
- support current ports in overloads
- pp: replace get_line overload use getline
- some event related fixes, analog initial
- fix analog init related bugs
- fix integer parameters in function args
- fix crash in noise source (ignore input nodes)
- sign fix laplace filter potential output

20250301-dev
============
* static state reinitialisation fixed
* event algorithm improvements
* port connections now optional
* overloading based on connections
* idt reset flag
* analog function ref in $limit call
* wildcard in udp table
* idiomatic mosfet model (demo/stub)
* sync/drop module plugin
* MODEL_CARD envelope for prototypes
* two more constants, from CMC policy
* $limit improvements, $discontinuity(-1)
* rework timer logic
* always block parse/dump

20241210-dev
============
* initial user defined primitives
* event "or" code generation
* bugfixes, cross event etc.
* paramset is a MODEL_CARD
* more functions/tasks are plugins
* catch up with gnucap, portlist & `include

20241031-dev
============
* expm1, logp1
* adjust port names and syntax
* string parameter range
* add coupled line example
* verilog style integer arithmetics
* clarify license situation

20241002-dev
============
* name spaces and state variables
* cross events
* timer event
* $discontinuity
* transition filter
* $port_connected
* vpulse device
* combined build with Gnucap

20240702-dev
============
* noise analysis fixes and test coverage
* paramsets: emit code for prototype module last
* bugfix short current probe
* fix mfactor bug in noise source
* add noise to diode.vams

20240430-dev
============
* fix output variable evaluation in paramset
* propagate reverse dependencies
* integer variable cleanup
* optimise out unused filter calls
* implement untest, retest
* small signal noise sources and analysis
* "mag" in ac_stim
* variable declaration type and range parse/dump.
* various paramset expansion and dump fixes
* fix optimised out dependency on short branch.
* bugfix mfactor in paramset instances
* initial trln and ltra examples

20240331-dev
============
* fix allocation in laplace
* fix uninitialised access in *dt filter
* refactor Tokens
* laplace_{zi,np,zp} filters
* zi_{zi,nd,np,zp} filters
* revisit build system
* attribute instance improvements
* output variables in paramset

20240229-dev
============
* build system improvements
* un-hack filter evaluation in do_tr
* laplace_nd filter
* $debug task
* bugfix uninitialised state in sources
* hotfix name unmangling

20240220
========
* array parse/dump
* ground statement code generation
* port flow stub (dummy code generated, zero flow.)
* new build system: out-of-tree build etc.
* parallel testing
* load plugins by directory, at startup

20231231-dev
============
* preprocessor conditional fix
* preprocessor quoted string fix
* diode.model port with switches
* $bound_step
* ac_stim
* sine sources
* $mfactor function and fixes
* fix dump: preserve unreachable shorts and probes
* netlist with analog blocks
* bugfix pragma parser

20231130-dev
============
* bugfix aliasparam
* bugfix pp nested conditional
* bugfix production build, casts.
* drop module variable derivatives
* refine (reverse) dependency tracking, fpi
* dump-annotate dependencies and reachability
* node equivalence, hard and conditional.
* keep track of event sensitivities
* deterministic output
* handle parametric constants in precalc_last
* ddt/idt: avoid internal nodes
* do not allocate unused filter nodes
* misc small fixes (see git)

20231031-dev
============
* commons hotfix
* fix shutdown crash
* partial attribute instance in lang_verilog
* bunch of optimisations
* paramset stub, vams/cap
* deps: fixed point iteration (fpi) stub
* more pragmas options

20230930-dev
============
* embed custom headers into output
* GPL compatible vams header from ADMS
* preprocessor: `elif
* unify FUNCTION and Token use
* revisit probe and dependency equality
* Token based dependecy tracking
* skip code generation for unused functions
* same for (some) unreachable conditional blocks
* simplify state and contribution code
* more binary operator optimisations
* provide (simple) examples
* fix contribution bug, mg1_polarity1.gc
* fix getlines memory issue

20230829-dev
============
* aliasparam
* func, task plugins
* tasks events, $strobe
* filter plugins
* slew filter stub
* paramset: param_count tie break
* sign bug fix in vsource
* indirect contribution
* limiting
* initial conditions

20230729-dev
============
* string handling
* systemtask parse/dump
* handle short branches
* probe vars with attribs only
* named branches
* preliminary value retention rules
* preliminary attribute_instance
* tr_probe_num: only include variables with attributes
* paramset/instance default param fix
* fix current port re-expansion in vaflow
* various bugfixes

20230623-dev
============
* analog functions
* control structures: while/for/case
* preprocessor fixes & cleanup
* support ternary operator
* add string, integer variable types
* expressions in parameter bounds
* ddx (without nested/second derivatives)
* generate is_valid (overloading)
* analog event stub
* switching branch

20230520-dev
============
* initial development snapshot
* preprocessing
* disciplines
* modules with ports & parameters
* partial derivatives
* current/voltage sources
* ddt/idt filters
* basic code generation