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Improper d-reg behavior with Yosys/Gowin

pending-verificationThis issue is pending verification and/or reproductionThis issue is pending verification and/or reproduction

Status: Open.

#5693 In YosysHQ/yosys;

· zapta opened on Feb 19, 2026

gowin: $_GOWIN_DP brams_map uses PORT_B_WR_BE for ADA byte enables instead of PORT_A_WR_BE, silently disabling writes

bug

fix-pendingPR with a fix is pendingPR with a fix is pending

Status: Open.

#5688 In YosysHQ/yosys;

· zaun opened on Feb 16, 2026

formal verification via synlig

question

Status: Open.

#5683 In YosysHQ/yosys;

· Ckaf opened on Feb 12, 2026

async2sync doesn't copy src attributes consistently

bug

Status: Open.

#5674 In YosysHQ/yosys;

· widlarizer opened on Feb 9, 2026

Yosys error message does not provide information about the location of the error.

error-handlingError handling and reportingError handling and reporting

Status: Open.

#5657 In YosysHQ/yosys;

· zapta opened on Jan 30, 2026

0.61: xaiger2-5169.ys test: ERROR: Expected error pattern 'Malformed design' not found !

pending-verificationThis issue is pending verification and/or reproductionThis issue is pending verification and/or reproduction

Status: Open.

#5656 In YosysHQ/yosys;

· strophy opened on Jan 30, 2026

sat: dff output changes without clock edge

pending-verificationThis issue is pending verification and/or reproductionThis issue is pending verification and/or reproduction

Status: Open.

#5654 In YosysHQ/yosys;

· widlarizer opened on Jan 30, 2026

dfflibmap violates selection through dfflegalize

bug

Status: Open.

#5650 In YosysHQ/yosys;

· widlarizer opened on Jan 29, 2026

ABC9 is replacing missing ports with ports connected to 0, breaking Nexus carry chains

pending-verificationThis issue is pending verification and/or reproductionThis issue is pending verification and/or reproduction

Status: Open.

#5639 In YosysHQ/yosys;

· gatecat opened on Jan 27, 2026

Possible <code>sim -r</code>/anyseq/VCD bug

Status: Open.

#5636 In YosysHQ/yosys;

· gussmith23 opened on Jan 26, 2026

memory_libmap -lib : Found error in internal cell

documentation

Status: Open.

#5634 In YosysHQ/yosys;

· ben-j-c opened on Jan 25, 2026

Spurious Yosys warning when building a Gowin project

pending-verificationThis issue is pending verification and/or reproductionThis issue is pending verification and/or reproduction

Status: Open.

#5632 In YosysHQ/yosys;

· zapta opened on Jan 24, 2026