202 lines
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202 lines
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<title>🎉 Release V13.0 — Icarus Verilog documentation</title>
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<section id="release-v13-0">
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<h1>🎉 Release V13.0<a class="headerlink" href="#release-v13-0" title="Link to this heading">¶</a></h1>
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<p>The Icarus Verilog development team is pleased to announce <strong>Release V13</strong> of Icarus Verilog.</p>
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<p>Release V13 builds on the V12 series with a focus on correctness, runtime stability, improved
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diagnostics, and incremental standard conformance improvements.</p>
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<hr class="docutils" />
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<section id="bug-fix-summary">
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<h2>🐞 Bug Fix Summary<a class="headerlink" href="#bug-fix-summary" title="Link to this heading">¶</a></h2>
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<p>Release V13 resolves numerous issues reported against V12, including:</p>
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<ul class="simple">
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<li><p>Incorrect signed constant handling.</p></li>
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<li><p>Generate block naming collisions.</p></li>
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<li><p>Elaboration-time assertion failures.</p></li>
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<li><p>Runtime crashes in malformed corner cases.</p></li>
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<li><p>Memory management issues during elaboration and simulation.</p></li>
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</ul>
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</section>
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</section>
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<hr class="docutils" />
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<section id="major-changes-in-v13">
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<h1>🔄 Major Changes in V13<a class="headerlink" href="#major-changes-in-v13" title="Link to this heading">¶</a></h1>
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<section id="language-elaboration-fixes">
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<h2>🧠 Language & Elaboration Fixes<a class="headerlink" href="#language-elaboration-fixes" title="Link to this heading">¶</a></h2>
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<p>Release V13 includes multiple fixes to elaboration and expression handling:</p>
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<ul class="simple">
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<li><p>Resolved generate block scope resolution issues affecting nested and conditional generate constructs.</p></li>
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<li><p>Corrected signed arithmetic corner cases, including shift and width propagation behavior.</p></li>
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<li><p>Fixed constant expression evaluation inconsistencies during parameter elaboration.</p></li>
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<li><p>Improved handling of packed and unpacked arrays in assignments and port binding corner cases.</p></li>
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<li><p>Addressed elaboration-time assertion failures triggered by malformed or ambiguous constructs.</p></li>
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<li><p>Corrected several source-location reporting issues for elaboration errors.</p></li>
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</ul>
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<p>These changes improve standards conformance and eliminate behavioral inconsistencies observed in the V12 series.</p>
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</section>
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<hr class="docutils" />
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<section id="simulator-vvp-improvements">
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<h2>⚙️ Simulator (vvp) Improvements<a class="headerlink" href="#simulator-vvp-improvements" title="Link to this heading">¶</a></h2>
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<p>The <cite>vvp</cite> runtime engine has received internal stability and correctness updates:</p>
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<ul class="simple">
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<li><p>Improved event scheduling behavior in zero-delay and non-blocking assignment scenarios.</p></li>
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<li><p>Fixed race-condition corner cases uncovered by expanded regression testing.</p></li>
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<li><p>Eliminated memory leaks affecting long-running or large simulations.</p></li>
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<li><p>Resolved crash conditions caused by invalid internal state transitions.</p></li>
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<li><p>Improved robustness of <cite>$dumpvars</cite> handling in large hierarchical designs.</p></li>
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<li><p>General runtime consistency and determinism improvements.</p></li>
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</ul>
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<p><cite>vvp</cite> continues to enforce version matching between the runtime and generated bytecode. Designs
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must be recompiled after upgrading.</p>
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</section>
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<hr class="docutils" />
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<section id="vpi-updates">
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<h2>🔌 VPI Updates<a class="headerlink" href="#vpi-updates" title="Link to this heading">¶</a></h2>
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<p>Fixes improve VPI reliability and conformance:</p>
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<ul class="simple">
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<li><p>Corrected hierarchical object lookup behavior in specific corner cases.</p></li>
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<li><p>Improved stability of callback registration during startup and shutdown.</p></li>
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<li><p>Fixed invalid handle dereference scenarios that could result in segmentation faults.</p></li>
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<li><p>Addressed inconsistencies in VPI object property reporting.</p></li>
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</ul>
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</section>
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<hr class="docutils" />
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<section id="diagnostics-toolchain">
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<h2>🛠 Diagnostics & Toolchain<a class="headerlink" href="#diagnostics-toolchain" title="Link to this heading">¶</a></h2>
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<ul class="simple">
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<li><p>Improved clarity and consistency of error and warning messages.</p></li>
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<li><p>Better reporting of width mismatches and implicit net declarations.</p></li>
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<li><p>More accurate diagnostic source locations.</p></li>
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<li><p>Build system updates for compatibility with modern compiler toolchains.</p></li>
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<li><p>Regression suite expansion and CI validation improvements.</p></li>
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</ul>
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</section>
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<hr class="docutils" />
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<section id="upgrade-notes">
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<h2>📦 Upgrade Notes<a class="headerlink" href="#upgrade-notes" title="Link to this heading">¶</a></h2>
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<ul class="simple">
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<li><p>Recompile all designs when upgrading from V12 or any other prior version.</p></li>
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<li><p>Review warnings carefully; improved diagnostics may expose previously silent issues.</p></li>
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<li><p>The only known breaking change is that wires must now be declared before use; which is required in the standard (see <a class="reference external" href="https://github.com/steveicarus/iverilog/issues/1287">gh1287</a>).</p></li>
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</ul>
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</section>
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<hr class="docutils" />
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<section id="acknowledgments">
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<h2>🙏 Acknowledgments<a class="headerlink" href="#acknowledgments" title="Link to this heading">¶</a></h2>
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<p>We thank all contributors who reported issues, submitted patches, expanded regression coverage, and
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improved documentation. Release 13 reflects continued community effort toward improving correctness,
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stability, and maintainability.</p>
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</section>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">🎉 Release V13.0</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#major-changes-in-v13">🔄 Major Changes in V13</a></li>
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