PSL with GHDL by tmeissner
This is a project with the purpose to get a current state of PSL implementation in GHDL. It probably will find unsupported PSL features, incorrect implemented features or simple bugs like GHDL crashs.
It is also intended for experiments with PSL when learning the language. You can play around with the examples, as they are pretty simple. You can comment out failing assertions if you want to have a successful proof or simulation if you want. You can change them to see what happens.
It is recommended to use an up-to-date version of GHDL as potential bugs are fixed very quickly. Especially the synthesis feature of GHDL is very new and still beta. You can build GHDL from source or use one of the Docker images which contain also the SymbiYosys toolchain.
For example the
hdlc/formal:min docker image provided by the hdl containers project (recommended). Or you build a docker image on your own machine using my Dockerfiles for SymbiYosys & GHDL. With both you have the latest tool versions available.
The next lists will grow during further development
Supported by GHDL:
Temporal operators (LTL style)
- logical implication operator (
- logical iff operator (
next_a[i to j]operator
next_e[i to j]operator
next_event_e[i to j]operator
beforeoperator (GHDL crash with a specific invalid property, see PSL before example)
Sequential Extended Regular Expressions (SERE style)
- Simple SERE
- Concatenation operator (
- Fusion operator (
- Overlapping suffix implication operator (
- Non overlapping suffix implication operator (
- Consecutive repetition operator (
[*i to j])
- Non consecutive repetition operator (
[=i to j])
- Non consecutive goto repetition operator (
[->i to j])
- Length-matching and operator (
- Non-length-matching and operator (
- or operator (
prev()function (Synthesis only)
stable()function (Synthesis only)
rose()function (Synthesis only)
fell()function (Synthesis only)
- Partial support of PSL vunits (synthesis only)
- Partial support of named sequences (simulation only)
- Partial support of named properties (simulation only)
- Partial support of PSL
endpoint(simulation only, in PSL comments)
Yosys formal extensions (reference to Symbiyosys docs)
anyconstattribute (synthesis only)
anyseqattribute (synthesis only)
Not yet supported by GHDL:
- Synthesis of strong operator versions
- PSL functions (
fell()are implemented for synthesis)
- PSL macros (
before_operator (Seems that LHS & RHS of operator have to be active at same cycle, see psl_before.vhd)
next_event_a[i to j]operator
eventually!behaviour with liveness proofs, see GHDL issue 1345
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