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 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.
Functions that appear in continuous assignment expressions and that
have hidden dependencies or side effects need to be re-evaluated
whenever any input to the expression changes. This patch adds support
in the compiler and vvp runtime to enable this. This is currently
activated for any system function call that has no arguments. The
user may also force it to be used for any user function by passing
the option -gstrict-ca-eval to the compiler driver.
This patch also removes the -dautomatic option which was used for
gaining confidence in the code that supports automatic tasks and
functions. It is believed that the testsuite provides reasonable
fault coverage, and further tests can be added if bugs are found.
In preparation for using the synthesize method to replace the
elaborate_net method of PExpr, rework the interface to the
synthesize() method. This changes no fnctionality, but does set
up the infrastructure for the next step.
This patch reworks much of the ternary code to short circuit when
possible and supports real values better. It adds a blend operator
for real values that returns 0.0 when the values differ and the value
when they match. This deviates slightly from the standard which
specifies that the value for reals is always 0.0 when the conditional
is 'bx. There are also a couple bug fixes.
These fixes have not been ported to continuous assignments yet.
Ternary operators used at compile time and in procedural assignments
should be complete (short circuit and support real values).
Rework the handling of file names to use a perm_string heap to hold
the file names, instead of the custom file name heap in the lexor.
Also rename the get_line to get_fileline to reflect its real duties.
This latter chage touched a lot of files.
Cary R
Stephen Williams
Martin Whitaker
steve