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CHANGELOG_OSDI.md

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Changelog - OpenVAF OSDI

All notable changes to OpenVAF relevant to OSDI will be documented in this file. The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[UNRELEASED]

Fixed

  • fix misscompliation of string parameters
  • fix crash when using target_cpu flag

23.5.0 - 2023-5-16

Added

  • Support for analog initial blocks
  • Allow ignoring errors when a port is declared without direction
  • User friendly Crash Handler
  • Warning when adding trivially open branches
  • Allow aliasparam to refer to system functions (like $mfactor)

Fixed

  • Allow parameter declaration without explicit types
  • Crash when using engineering real format specifier %r
  • Crash on windows when calling $display (missing osdi_log symbol)
  • idt operator not working (reactive dimension was undefined)
  • incorrect param_given results after setting instance parameters on the model struct.
  • Panic when accessing current probe that always returns 0

Internal Improvements

  • Update to LLVM 15+ (opaque pointers)

23.2.0 - 2023-02-01

Breaking Changes

  • Removed LLD integration which made packaging exceptionally difficult and caused crashes on Windows. That mean that OpenVAF now requires that the system linker (and ucrt.lib when targeting windows) are available.

Fixed

  • Correctly detect file encoding.
  • Invocations of $limit that use user defined functions.
  • Correctly parse net declarations without attached discipline (usually ground).
  • Panic that occurs when a model contains no branch contributes.
  • Panic for voltage sources when the associated current is unused.
  • Panic for parameters with exclude expressions.
  • Panic for instance parameters.
  • Swapped signatures for slew and transition
  • aliasparam declarations being ignored

22.12.0 - 2022-12-16

Added

  • Added support for absdelay
  • Added support for the analysis function (always returned true previously).
  • Automatically remove unused nodes (includes noise network until noise support is added).
  • Added errors for branches with incompatible disciplines.
  • Statically integrate the lld linker and C runtime shims to remove any external dependencies.
  • Added --print-expansion CLI option to print the preprocessed file.
  • Enable LLVM Scalar Vectorization to automatically use SIMD instructions where possible.

Fixed

  • Do not generate unknowns for noise phase shifts with ddt.
  • Provide errors instead of crashing for unsupported Verilog-A builtins.
  • Provide errors instead of crashing for illegal nature access.
  • Rare miss-compilations/crashes caused by treating a branch instruction as a jump instruction during CFG simplification.
  • Discontinuity in the derivative of pow(x,y) for x=0.
  • Unhelpful syntax errors for item declarations
  • Crash when encountering potential/flow probe with no arguments

0.1.2 - 2022-07-19

Added

  • Added support for $limit
  • Added support for $abstime (now returns a non-zero value for large signal simulations).
  • Added support for $bound_step (now the simulator can read the minimum value passed to $bound_step).
  • Add general description to the start of the help text.

Changed

  • Validate format arguments and properly handle all argument types instead of just passing the format specifier to C

0.1.1 - 2022-06-26

Changed

  • Refactor the algorithm that determines whether ddt needs an unknown, so that OpenVAF doesn't create one when not required.
  • Automatically add whitespace between auto generated format characters for $strope etc.
  • Check that fmt literals used in $display are correct and match the format arguments to avoid crashes/undefined behavior.

Fixed

  • ddx always returned 0
  • Remove infinite loop during global value numbering optimization.
  • Linking error if cache directory was missing during batch compilation.
  • Fixed crash for nodes without any contributions besides collapsing
  • Fixed select expressions producing incorrect values
  • Fixed that the cache-dir argument was called cache-dir (typo)

0.1.0 - 2022-06-20

Initial prototype release