Issues

• Problem in iverilog-vpi cflags and cxxflags in Ubuntu 26.04, iverilog 12.0-3 build

  steveicarus/iverilog#1530 · Filter by author it4k4i opened on Sep 28, 2026
  1

• vvp crashes with a stack overflow on a stable loop through a strength-aware or real net

  Bug
  steveicarus/iverilog#1513 · Filter by author haskiindahouse opened on Sep 14, 2026
  4

• buf/not/tran with output terminals of different widths aborts on an assertion in PGBuiltin::elaborate

  Bug
  steveicarus/iverilog#1511 · Filter by author haskiindahouse opened on Sep 14, 2026

• Assertion failure in elab_net.cc for a non-ANSI unpacked-array output port

  Bug
  steveicarus/iverilog#1466 · Filter by author qinkejiu opened on Aug 5, 2026
  2

• parameter string cannot be referenced in parameter-override expressions

  Bug
  steveicarus/iverilog#1442 · Filter by author matx-amy opened on Jul 16, 2026

• inconsistent handling of scalars and vectors over vpi

  steveicarus/iverilog#1441 · Filter by author JakaBac opened on Jul 15, 2026

• unique / unique0 case qualifiers are ignored during compilation (vvp.tgt sorry)

  Enhancement
  steveicarus/iverilog#1436 · Filter by author ParshuramGD opened on Jul 11, 2026

• Stack buffer overflow in tgt-vvp/draw_vpi.c for wide literal VPI args

  Bug
  steveicarus/iverilog#1407 · Filter by author matx-sdaniel opened on Jun 25, 2026

• "error: This assignment requires an explicit cast."

  Enhancement
  steveicarus/iverilog#1396 · Filter by author spth opened on Jun 21, 2026
  1

• Missing warning for unpacked array write when dynamic index is X/Z

  steveicarus/iverilog#1381 · Filter by author MrCookieeeee opened on Jun 1, 2026
  1

• Add the Icarus Verilog logo to the documentation

  Enhancement
  steveicarus/iverilog#1356 · Filter by author hwhsu1231 opened on May 13, 2026
  5

• iverilog -tvvp generates non-relocatable absolute VPI module paths

  Enhancement
  steveicarus/iverilog#1344 · Filter by author rhabacker opened on May 8, 2026
  2

• always @(negedge) not triggered on time-0 transition when initial is declared first

  Enhancement
  steveicarus/iverilog#1326 · Filter by author m2kar opened on Apr 22, 2026
  4

• Partially-Driven output logic Vector Initializes Undriven Bits to z Instead of x

  Bug
  steveicarus/iverilog#1325 · Filter by author m2kar opened on Apr 20, 2026
  4

• No warning on dynamic Out-Of-Bound array access

  Enhancement
  steveicarus/iverilog#1322 · Filter by author MrCookieeeee opened on Apr 13, 2026
  2

• [BUG] Variable written in an always_ff block must not be written by any other process

  Enhancement
  steveicarus/iverilog#1317 · Filter by author MrCookieeeee opened on Mar 31, 2026
  3

• Assignment patterns (IEEE 1800:2012, chapter 10.9)

  Enhancement
  steveicarus/iverilog#1294 · Filter by author dettus opened on Jan 30, 2026
  1

• Assertion failed: (net), function ivl_nexus_ptrs, file t-dll-api.cc, line 1791.

  Bug
  steveicarus/iverilog#1291 · Filter by author shirriff opened on Jan 7, 2026
  2

• command file read with LF fails

  steveicarus/iverilog#1288 · Filter by author aviadb opened on Nov 27, 2025
  4

• Signal declaration after use not supported

  Enhancement
  steveicarus/iverilog#1287 · Filter by author MichaelBell opened on Nov 14, 2025
  45

• Confusing error message for "input reg"

  Enhancement
  steveicarus/iverilog#1284 · Filter by author shirriff opened on Oct 28, 2025
  7

• Enum names not saved in the vcd

  Enhancement
  steveicarus/iverilog#1283 · Filter by author ArcSpecter opened on Oct 23, 2025
  1

• Cannot automatically connect bit based port to real

  steveicarus/iverilog#1278 · Filter by author L3odr0id opened on Sep 16, 2025
  2

• Multidimensional indicies are not properly supported.

  Bug
  steveicarus/iverilog#1277 · Filter by author avgsurfman opened on Sep 16, 2025
  3

• Assertion failed: (ivl_stmt_lvals(net) == 1), function force_link_rval, file vvp_process.c, line 1008.

  Bug
  steveicarus/iverilog#1276 · Filter by author shirriff opened on Sep 14, 2025
  2