Add support for detecting when to add a $signed() or $unsigned() to
create a self-determined context. This makes the test in the test suite
pass, but there could still be issues
The actual signal code is trivial, but the emit expression code needed
to be enhanced to pass a flag that says if one of the arguments in a
binary (except the shifts) or ternary (excluding the condition) context
is unsigned. This information is used to prevent emitting an explicit
$unsigned() for a signal that is used in this context since it will be
implicitly cast to unsigned.
This patch finishes the code needed to translate a SystemVerilog package to a
module with a special name. It also adds code to report that class scopes are
not supported and treats both a class and package as a top level scope.
This patch adds support for SystemVerilog packed arrays and adds sorry
messages for generate blocks as well as the new SV final and
fork/join_any/join_none statements.
Rework the nexus emitting code to correctly translate most I/O ports.
Fix a few other expression issues uncovered when port translation was
done correctly. Ignore and warn that the SV ++/-- operators and enum
types are not translatable. More updates of the nexus debug code.
Icarus uses 'i' in the net expressions for a cast to integer. Replacing
it with 'v' would free the character 'i' that can be used for increment
operators. This changes cast operators to become 'v', '2', and 'r'.
Signed-off-by: Prasad Joshi <prasad@canopusconsultancy.com>
Suggested-by: Cary R. <cygcary@yahoo.com>
isprint() is defined to take an int and if it is defined as a macro then
you can get a warning that a char is being used as an array index. This
patch fixes this warning in tgt-vlog95/msic.c
This patch adds the ability to print a constant string in a
structural context. It also fixes the argument order for
structural function calls and makes a few improvements in
nexus identification.
This patch adds support for correctly handling most unconnected ports.
Most important is top level ports that are the root of the conversion.
This patch also adds support for emitting more signed constructs when
they are requested. $signed() and $unsigned() are still not supported
or recognized as an error when not emitting signed constructs.
This patch adds support for emitting escaped identifiers and adds
code to correctly emit most module port expressions/definitions.
There are some minor code optimizations/cleanup included as well.
This patch adds support for emitting fixed CA selects (zero based
variable bit and array selects also work), emitting a for statement
as a single statement and fixes for numerous little bugs. It also
adds the start of emitting module port information.
This patch adds partial support of procedural variable indexed part
selects (both R and L-value). The restriction is that this currently
only works on a zero based little endian vector. I need to know if
the select is an up or down select to correctly denormalize the base
expression for the general case.
This patch adds code to emit variable real procedural delays by
removing the scaling that is added by the compiler. It also
recognizes that all variable continuous assignment delays are
scaled at run time.
This patch reworks the delay emitting code to handle delay expressions
better. It also encloses the emitted unary operators in parenthesis to
make sequenced unary operators work properly.
It was incorrect to extend emit_expr_signal() to handle a local signal
(a continuous assignment). The only way this should ever happen is
when evaluating a variable delay expression. It is better to do this
checking in the delayx evaluation where we know if we are processing
a delay for a statement or a continuous assignment. This keeps the
emit_expr_signal() routine cleaner and we only allow a CA delay for
a continuous assignment.
This patch fixes the following bugs in the vlog95 converter:
When emitting a signal as an expression, if the signal is local then
emit the expression that is driving the local signal.
The casts need to emit the expression.
When emitting pull devices they have different default strength rules
(pull is the default).
For compatibility pull devices should only have a single output net.
Extend the code that searches for the <var> = <delay> <value> pattern
to also check for an <event>. The previous event code only looks for
the repeat event pattern.
This patch add the following functionality to the vlog95 generator.
Add support for most CAs. Selects still don't work correctly.
Emitting a named event as an expression.
Enhance the ability to find a signal in a nexus.
Add code to emit a nexus driven by a constant.
Rework the delay/strength code for logic gates/CAs
Refactor some of the number code.
Refactor the variable emitting code to support named blocks.
Translate the compiler code back to <var> = <event> <value>
This patch adds support for emitting an array as an expression. This is
used as a system task/function argument.
It partially reworks the real display code to print an appropriate
expression for NaN, inf and -inf. To get other real numbers to always
display correctly we need to build a custom printing routine that adjusts
what is displayed based on the actual bits in the double.
Add the ability to print a real variable delay. They are not scaled by
the compiler.
Since a delayx delay may be variable we must always enclose this type of
delay with parenthesis.
Fix the L-value concatenation to be in the correct order.
Handle the special case that an if with a single if as the true statement
does not loose any associated else clause to the enclosed if. Basically
add a begin/end pair as needed to make things work out correctly.
This patch adds preliminary support for finding the correct name for
a nexus at a given scope level. It also does the following.
Report that real modulus is not supported.
Fix a bug in the generation of concat expressions.
Add missing generation of unary ! operator.
Add ability to generate > integer delays.
Refactor some of the support code.
Make some of the error messages more descriptive.
Ignore the ALLOC and FREE statements (only used with automatic tasks).
This patch adds significantly more functionality to the vlog95 back end.
The following are the major additions:
Display unsigned numbers without undefined bits in hex.
Add support for both L-Value and R-value bit and part selects.
Added support for out of scope references.
Added support for emitting logic gates (range not finished, name is invalid).
Added support for emitting initial/always blocks.
Add support for event inter statement delays.
Convert a blocking inter statement delay assign back to the original form.
Added support for rescaling variable delays.
Added support for the disable statement.
Added support for an event trigger statement (event name is missing).
Added support for calling a user task (calling arguments are missing).
Added support for an event based delay statement (@) (event name is missing)
Not all of these are working as expected since there is not currently a
routine to find a nexus name as a function of scope (needed for event names,
logic gate ports, etc.). Since the Icarus compiler generates structural code
the arguments to modules, module instantiations and calling user tasks are
also still missing.
This patch adds support for the various case statements and adds
preliminary support for instantiating modules. The module instantiation,
just like the module definition, is still missing ports. Adding this
will require modification to the compiler to get the port order correct.
Because of defparams and passed parameters any module that has a
parameter must be generated uniquely for each instance since they may not
all be the same. Modules without parameters are only generated once.
This patch adds the ability to print a delay expression (it is rescaled
to the module timescale) and adds support the following statement types:
nonblocking assignment with a delay (event control is still missing)
condition (if/else)
forever
repeat
while (Icarus translated for loops to while loops)
fork
procedural continuous assign
deassign
force
release
Martin Whitaker
Cary R
Prasad Joshi
Larry Doolittle