The << operator may not be defined when the RHS is greater than or
equal to the LHS width. To work around the problem the mask is
incrementally generated.
There have been reports in the field of number-to-real conversions
doing bad things with the calculated mantissa. This patch eliminates
a opssible portability problem by reworking the negating of negative
mantissa values.
Signed-off-by: Stephen Williams <steve@icarus.com>
Print out a warning if extra digits are given for sized binary, octal
or hex constants. Decimal constants are very hard since we never
calculate the true number of bits the digits represent, so for now
decimal constants are not checked.
The attached patch add an implementation for $dumplimit(). It does
not do a hard limit to the file size, but for VCD files it completes
the current time step and puts a comment in the file. For lxt and
lxt2 files the functionality is in place, but because of buffering
the file can be slightly larger than expected.
Factor common code for processing signed constants to be padded.
In the process, fix some minor bugs in the padding decisions.
Signed-off-by: Stephen Williams <steve@icarus.com>
Fixed some signed/unsigned warnings, including one that caused an
actual runtime error if not dealt with safely.
Signed-off-by: Stephen Williams <steve@icarus.com>
The argument to $unsigned is self-determined no matter what the
context the $unsigned itself is in. This is important only where
the result can be negative but the result width is context-determined.
Do ocntext fitting manually to prevent the context fitting it and
affecting the expression argument.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch implements the System Verilog $urandom() and $urandom_range()
functions. There are no check to verify that $urandom_range is only given
unsigned arguments. If you give it a negative value the bit pattern will
be interpreted as a unsigned number.
Fix the handling of expressions that have unsized integers and are
in self determined context. Unsized integers are generally assumed
to have at least 32bits.
Signed-off-by: Stephen Williams <steve@icarus.com>
Constant propagation incorrectly elided an entire constant net node
if only the LSB of the driven vector was HiZ. This caused the entire
vector to look like HiZ. Also, the code generator for writing the
constant values missed bits.
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 the ability to call command files from other command
files. There is currently a limit of 16 total levels deep (15 stored
plus the current file). -f is now an alias for -c for both the command
line and command files. The parser also reports errors when they occur
along with the file name and line number to aid in debugging problems.
In expressions, user defined functions have a clearly defined
width and the test_width expression needs to express that. Note
that the $signed/$unsigned functions are special and magical.
Signed-off-by: Stephen Williams <steve@icarus.com>
Variable word addresses are not to be adjusted by the bit select
of the vector direction. That is a holdover from when arrays were
stored as bit vectors.
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.
The outputs to bufif and nmos/pmos devices are always strength-aware,
so should have their outputs connected to a net8 device.
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch adds min_typ_max to expressions. Remember when using a
min_typ_max triplet in an expression they must be enclosed with
parenthesis (1364-2001 section 4.3 page 58).
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
It is legal in Verilog to bind expressions to ports that do not
match the port width. Icarus Verilog needs to create the necessary
part selects to get the connections right.
Signed-off-by: Stephen Williams <steve@icarus.com>
Add code to handle all the primitives currently defined and
fixed a power of ten error in the time units display (it is
either 10^{units} or 1e{units}, but not 10e{units}).
This patch adds functionality to verify that primitives are given
an appropriate number of ports. For multiple output gates (but,
not, pulldown, pullup) it also reports that Icarus currently does
not support multiple outputs when more than one is given.
When a repeat concatenation expression is translated to a netlist,
get the repeat expression right. This comes up when an elab_and_eval
elaboration contains a repeat concationation, and the expression is
ultimately turned into a netlist by expr_synth.
Signed-off-by: Stephen Williams <steve@icarus.com>
Signed divide of 32bit values can overflow if done in a 32bit long
due to the truncation of sign bits. So use the large value algorithm
if the values are >= 31 bits (63 bits on 64bit machines).
Signed-off-by: Stephen Williams <steve@icarus.com>
This patch adds checks to verify that functions do not invoke
statements that are invalid for them (#, @, wait, enable/call
tasks and non blocking assignment). For reference see section
10.3.4 of 1364-2001.
C style comments were not recognized as comments in false or
suppressed sections of ifdef/etc. blocks. This prohibited an
unneeded endif/else/etc. from being commented out with this
style of comment.
I decided not to delete these since we may at some point in time want
this functionality back. For now they are commented out with an
explanation so we know what is going on.
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.
Cary R
Stephen Williams
Larry Doolittle
yang yun ju
Martin Whitaker