The %ix/getv instruction loads an integer register directly from
a signal vector. This is an optimization that an index register
is loaded from an expression is only a signal. It avoids the thread
vector space.
Use the new array VPI functionality (vpiIndex, vpiParent, vpiArray)
to dynamically generate array word names. The old patch to implement
was mostly reverted.
Add the array related VPI calls. These will be used to generate
the array word name only as needed to conserve space. This patch
also makes scanmem3 from the vpi test work correctly after a
slight gold file update.
Where and expression is an immediate value added to a signal value,
it is possible to optimize them to a single instruction that combines
the load with an add at the same time.
The functor counters were left over from the v0.8 release. Rework
the counters to be relevent to the current state of vvp.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch adds the ability to dump array words. The words are only
dumped if they appear in a $dumpvars() statement (they are not dumped
by default). The name used for the word is <array_name>[<index>], so
you can get unexpected name conflicts.
There is also a slight increase in the memory requirements since each
array word now keeps its own name information. In the future we would
like to change this, but that is a much larger rewrite of the array
code in vvp.
This patch also needs the "Prefix escaped identifier ..." patch to
work correctly (the array word name is an escaped identifier).
Implement extended vvp command line options to control the amount
of detail that the sdf annotator emits while parsing the source
file.
Signed-off-by: Stephen Williams <steve@icarus.com>
Pass parsed SDF delays into the vvp run time as vpiScaledRealTime
variables, and handling the mapping of 2-values to 12-delays.
Signed-off-by: Stephen Williams <steve@icarus.com>
This was causing a core dump for a number of the vpi test cases.
The problem was that they did not need the simulation time, so it
was being set to NULL. The problem was the EndOfSimulation callback
was always setting cb_data.time to the current time. A big problem
when the pointer was NULL. The solution is to only set the time
when the pointer is not NULL
String values are known to be 2-value bits, so they are natural
candidates for using the movi instruction to load the value in
far fewer instructions. With this patch, up to 16bits (two bytes)
at a time can be loaded per instruction.
Signed-off-by: Stephen Williams <steve@icarus.com>
A previous patch I submitted to try and keep the $finish time
events missed the case of an infinite loop that did not advance
the micro time step which then prevents the debugger from
generating a finish (you can interrupt an infinite loop, but you
could not finish out of it). This patch adds a check for a
finish after each debugger call to fix this problem.
When nets are forced by non-constant expressions, the value is linked
to the destination net through a force_link. This patch adds the code
needed to unlink a force/link so that release and new force/links can
work. This fixes pr1735836.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch adds marks at simulation end if needed and enabled (on
and not over the limit) for vcd/lxt/lxt2 files. End of simulation
callbacks also now have the correct simulation time. The default
file names for lxt and lxt2 now match the vcd file except for the
extension. lx2 is also an alias for lxt2 and the default lxt2 file
extension is lx2. This matches what GTKWave expects. Any lxt2
diagnostic output print LXT2 instead of LXT to make it clear which
dumper you are using.
This patch fixes/enhances the array part select code. It also
verifies that any lval array index in a continuous assignment
is a constant value. Also, %set/av now uses index register 1 as
described in the documentation (as a bit offset).
Add/rework VPI access to modpaths. This allows VPI code access to
paths described in specify blocks. In the process, the VPI structure
has been reworked to conform to the IEEE1364 standard.
Signed-off-by: Stephen Williams <steve@icarus.com>
Cleanup klunky implementation of vpi_get/put_delays for modpath
objects. Remove some useless members.
Signed-off-by: Stephen Williams <steve@icarus.com>
Wide division/modulus (more bits than unsigned long) gave incorrect
results when both the divisor and dividend where the same. They also
did not produce an error message when dividing by zero.
The modpath source node defines the modpath object, and carries the
nodes for the source expression. The modpath outputs are references
by pointers to the vpiModPath that is not in itself a vpi object
any more. This makes the VPI view of a module path look like the
source-destinaiton pair that is the IEEE1364 description of the
modpath.
Add vvp support for modpath path term outputs. This also introduces
the concept of path terms and moves towards the path term in general
for getting at the endpoits of a modpath.
Clean up rather poorly written modpath vpi support, fixing the
parse of the modpath syntax element to not use pointless globals.
Collect the modpath code into the delay.cc file instead of the
inapropriate vpi_signal.cc source file.
Signed-off-by: Stephen Williams <steve@icarus.com>
signed compare in proceedural code was comparing the absolute
value if both operands were negative. Wrong!
Signed-off-by: Stephen Williams <steve@icarus.com>
Implement compare-immediate instructions and generate code to use
these new instructions to improve runtime performance.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch adds ivl_scope_time_precision() to the compiler which can
be used to extract the local scope precision. tgt-stub and tgt-vvp
have been modified to use this new function and output a value that
is appropriate. The vvp runtime has been altered to use this new
data which is accessed with the vpip_time_precision_from_handle()
function. vpiTimePrecision uses this function to return the correct
precision.
Add support for accessing the modpath nodes via PLI,
and add support for the vpi_set_delays and vpi_put_delays
functions to set the delays on those paths.
- GSoC 2007
This patch splits the end of compile and the start of simulation call
backs code into two different procedures. The end of compile events are
still executed at the same time they alway were. The start of simulation
events are now run after initialization.
The event loop used to check for $finish at every iteration. This patch
alters this behavior to only check just before you advance to the next
time step. This allows events for the current time step to complete.
Modified the code that deals with real variables to accept an integer
value when using vpi_put_value(). Also added some type of diagnostic
message for all switch defaults that have an assert(0) to indicate an
error condition, removed CVS comments and removed a small section of
unreachable code.
It is possible for the compiler to generate logic gates that have
inputs from part select nodes. This implements the part select
input methods.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch makes vpiFullName for real variables return the correct
value. A Scope reference was added to the base structure along with
the relevant code to support generating the full name. A couple of
memory leaks were plugged and some formatting fixed as well.
It appears that other simulators allow the second argument to
vpi_handle_by_name to be either a scope or a module. Allowing
a module in addition to a scope significantly increases the
usability of this function.
vpi_get_str() can now return a reasonable value for most of the
types used in vvp. I'm not certain I got all of them, but they
are easy to add if any are missing. I also fixed a couple of
typos that I found while looking for all the different types.
This patch adds the missing vpiFullName property to binary and
string parameters (FYI real parameters are not currently supported
by the VPI interface).
Stephen Williams
Cary R
Larry Doolittle
yang yun ju
Martin Whitaker