In 1364-2005 it is an explicit error to take the select of a scalar
or real value. We added the checks for real a while ago. This patch
adds the functionality for scalar values. In the future we may want
to push the scalar property to the run time.
This patch add code to print a warning message if it finds both a
default and `timescale based delays. The -Wall or more specifically
the -Wtimescale flag can be used to find the module with the missing
`timescale directive.
This patch adds interactive support for $stop and $finish.
$stop displays a message that the simulator is already stopped.
$finish acts exactly like (calls) the interactive "finish"
command. Having $stop do nothing and $finish not finish until
you exit interactive mode is not very intuitive.
This patch adds better error messages (compiletf) for the optional
system tasks and functions (Annex C 1364-2005). Doing this also
makes calling them fail more gracefully (it is no longer a RE).
This patch add a new system function $readmempath. It accepts
a ":" separated list of directories that $readmem{b,h} will
use when trying to open a given file. If the file given to
$readmem{b,h} starts with a '/' (an absolute path) the search
list will not be used. A new call to $readmempath will replace
the previous search list with the given list. The search list
elements are check to see if they exist and are directories.
If not a warning will be displayed and they will not be added
to the list.
This patch allows a macro expansion to have an argument which
itself has multiple arguments (handle nested ",").
(cherry picked from commit 047828ded0)
This patch adds support for recursive module loops if the
loop contains a generate block. The assumption is that the
user is doing the right thing in the generate block to make
the loop terminate. For this case there is also a check
that limits the number of loops (default 10). This prevents
the system from crashing when the user did not correctly
terminate the looping structure. The limit can be changed
by the user if needed.
(cherry picked from commit 5e723bfd61)
When adding history (add_history) use both the existence of the
library and the header file to determine if history can be
supported. Add a new USE_HISTORY that is the and of these two.
(cherry picked from commit 4b2e5e5914)
Only sign extend the operands for division or modulus if
both of them are signed. Previously only the individual
operand signedness was being considered.
(cherry picked from commit d074a37a2d)
The standard does not allow this, but it appears that other
simulators do. This patch adds the functionality, but prints
a warning message for the invalid task definition.
(cherry picked from commit 46350da5f0)
Most conversion codes in the scanf routines are supposed to
skip leading space. This patch adds that functionality.
(cherry picked from commit e987162cb9)
This patch fixes the code generator to correctly create three value
constant delays. It also fixes a bug in the compiler related to the
precalculation of the high-Z delay when only two delays are given.
Previously if was using a pointer not a value comparison to find
the minimum value.
Variable delays should work when one or three values are given.
For the two value case we need to do a comparison at run time and
that will require changing the compiler/run time interface so that
can only go into the V0.10 branch. This patch can be applied to
both development and V0.9. I have added a sorry message and an
assert for this case. I will add the variable two delay case at a
later time. We also do not support mixing constant and variable
delays on a single statement. That is a much bigger change and
can wait until someone asks for it.
(cherry picked from commit b1cb80b32e)
When a PGAssign is driven by (r-value) a bit, part or indexed
select and the strength is not the default (supply). Then
we need to create a driver (BUFZ) to convey the strength
information.
(cherry picked from commit 85e2bf3e55)
When displaying a verireal constant value force the display
of the decimal point and trailing zeros. This prevents 2.0,
etc. from being display as "2". which can be confused with
decimal two.
(cherry picked from commit 74ea0ecb4a)
This patch enhances the error messages emitted when trying to
select part of a real value. It now includes the signal name
so it is easier to debug.
(cherry picked from commit 3517f11c2c)
This patch adds checks in various places to prevent the user from
taking a select of a real value (bit, part and indexed selects).
(cherry picked from commit 5852f1eb7a)
The signed_flag should only be set when the expression is signed
and an ARS is used a normal RS should never be signed.
(cherry picked from commit caab6cab9d)
This patch adds basic support for getting and putting values to
real array words. This will be finished during the VPI rework.
(cherry picked from commit 1dbc517164)
The previous code looked for more than one array word to determine
if the given signal was an array or not. The problem with this is
that a single word memory was considered a signal. This is fixed
here by looking for an array_dimension to be greater than zero.
(cherry picked from commit 3d449f60a2)
This patch fixes the following problems in the right shift code.
The >>> result is only signed if the l-arg is also signed.
The r-arg is always unsigned.
Only sign extend the l-arg when the >>> operator is used.
This relates to an optimization for certain constant shifts.
Removed some obsoleted/outdated code.
(cherry picked from commit d7f272d14c)
When the VAMS math functions were originally built we did a
straight copy of the log() function to $log(). This can
conflict with other Verilog-D definitions of $log. We
need to deprecate this function and remove it before the
next major release.
This patch adds the $fread() system function. Icarus does not
currently allow missing arguments in functions so the following
standard specified functionality is not supported:
res = $fread(mem, fd,,count);
It also fixes a memory leak in fopen related to the get_filename
refactoring I recently did.
This patch adds support for virtualized register arrays to the
tgt-stub back end.
Based Cary's patch, but with a slightly different style.
Both work fine.
To get the correct print format for a 64 bit value it is much
better to use <inttypes.h> (when available) than building our
own value. This allows MinGW to use the non-standard I64.
the following example returns ||. This patch fixes it to return |0|.
module t();
wire [3:0] b;
initial
$monitor("|%0b|", b);
assign b = 0;
endmodule
(cherry picked from commit c9d2400dd0)
It is valid to have a repetition of zero inside a concatenation
that has other elements with a defined width. This patch adds
this functionality to the synthesize method. It also prints
an error if you try to synthesize a zero width constant.
(cherry picked from commit fa8a3d6c2e)
The Multiword division was not handling some degenerate high
guesses for the intermediate division result guess. The end result
was an assertion. Recover from this case.
(Does the addinb back of bp need to be optimized better?)
(cherry picked from commit 6715426833)
The arithmetic operands are signed only if both operands are signed.
If the expression is unsigned, then the expression as a whole needs
to be processed as unsigned in order to get padding right.
(cherry picked from commit c4a62dee0d)
When a pin array is virtual, dll_target::signal() doesn't need
to make a corresponding set of stub nexa.
This patch includes new detection of oversized arrays, configurable
with the ARRAY_SIZE_LIMIT flag. This limit only applies to devirtualized
arrays; virtual arrays are only limited by your architecture's
unsigned int type.
The concept and earlier versions of this patch have been successfully
stress-tested by multiple people. This one causes no testsuite
regressions on my machine.
Closes: pr2023076
(cherry picked from commit 3a18bda8ee)
Flag is DISABLE_VIRTUAL_PINS. Try to give a helpful hint for
how to work around any problems our regression testing might
have missed.
(cherry picked from commit 67381431ed)
NetBus wasn't initializing pin direction.
I hope Link::PASSIVE is correct for busses!
No test suite regressions.
(cherry picked from commit f344515e38)
Reduces resource usage when compiling large memories.
Normal usage patterns still create large nexus arrays
in t-dll.cc:dll_target::signal().
This patch is extensively tested; it shouldn't break anything.
The existing debug "optimizer" flag is (ab)used to control
message printing when large (>1000 element) arrays are
devirtualized or nexus-ized.
The new global variable disable_virtual_pins is available
to force allocation of Pin arrays when they are declared,
but no user interface is provided.
See extensive discussion on iverilog-devel, March 4-5 2009,
title "pr2023076: large memories".
(cherry picked from commit 5bc41e1a17)
Cary R
Larry Doolittle
Stephen Williams
Purdea Andrei