If one of the arguments of a comparison expression has a real value, then
the expression with is 1 no matter the width of the other argument. This
means that the arguments may have different widths in this special case.
Patch is from pr2251119, suggested by Martin Whitaker.
Even though we cannot immediately give a width for a concatenation
that has a repeat expression (the expression must be evaluated first)
we still must scan the test_width of the arguments so that they can
resolve their types.
Signals may have VMA disciplines attached. Make the attached discipline
visible through the ivl_target.h API. Also, re-arrange the internal
handling of the discipline structure so that we can expose disciplines
through the ivl_target C API without creating new structures. The
t-dll-api implementations of the discipline access functions can look
at the elaborated discipline structure directly. This is possible since
the discipline parse and elaboration are very simple.
This patch splits any VVP net functor that needs to access both
statically and automatically allocated state into two sub-classes,
one for handling operations on statically allocated state, the
other for handling operations on automatically allocated state.
This undoes the increase in run-time memory use introduced when
automatic task/function support was first introduced.
This patch also fixes various issues with event handling in automatic
scopes. Event expressions in automatic scopes may now reference either
statically or automatically allocated variables or arrays, or part
selects or word selects thereof. More complex expressions (e.g.
containing arithmetic or logical operators, function calls, etc.) are
not currently supported.
This patch introduces some error checking for language constructs
that may not reference automatically allocated variables. Further
error checking will follow in a subsequent patch.
The arguments of logical and/or are self determined, and the width is
fixed as 1 bit. Account for this special behavior by creating the
PEBLogic class.
The comparison operator operands are self determined, but are forced
to be the width of the wider operand. This means that the operands must
be evaluated with their widths truncated. In spite of all this, note
that comparisons expression results are 1 bit wide.
Continue cleaning up shadowed variables, flagged by turning on -Wshadow.
No intended change in functionality. Patch looks right, and is tested
to compile and run on my machine. No regressions in test suite.
The condition expression needs its width tested, even if the width
is not used. Also clean up some handling of widths/types for other
expression types.
The right-operand of shift expressions is self-determined, but we still
need to run a test_width to get the PExpr decorated with types and
expression widths.
The l-value doesn't really constrain the size of unsized expressions
because there are possible sub-expressions that may pull high bits
down to the low bits. (Divide, for example.)
If either of the operands of a ternary expression are unsigned, then
both are treated as unsigned. It works just like a binary expression
in that regard.
The results of comparisons are unsigned, but the arguments may be signed
and the calculation performed may be signed. Handle the padding properly
for comparisons so that the math is properly signed.
Later passes need the intermediate results for width and size so that
some special cases, were self-determined arguments occur, can be
processed properly during elaboration. This can be especially tricky
and interesting for ternary expressions.
This patch fixes the expression width calculation for a multiply
operation with an unsized operation. The expression width needs
to be at least the minimum of the maximum multiply result width
and the width of an integer.
This patch removes all the checks for constant expressions performed
during the parsing phase, as these checks are (mostly) repeated during
elaboration. It adds the missing check in the elaboration phase (the
RHS of a register initialisation), and improves the error reporting
and error recovery in other checks.
This patch fixes pr2132552, which was caused by a fault in the parser
constant expression checking.
Multiply of any expression with constant 0 will always return zero.
We can handle this early, during elaboration, and save a lot of code
downstream the trouble.
Also, while we are at it, fix up test_width to re-test the left
expression width if the right expression width is unsized. This allows
for the left expression code to adapt to the unsized-ness of the
expression context.
There are cases where the r-value doesn't pad itself to the width
that is requested by the call to elaborate_expr. This impacts the
elaboration of PGAssign. Pad/sign extend as appropreate.
The arguments to bitwise operators are padded if *either* of the operands
is unsigned. This is according to the sign/unsigned expression rules
of Verilog, and also matches the behavior of the "Big-3."
The addition of UINT_MAX in netlist.cc requires #include <climits> when compiling with gcc-4.3.2.
I also noticed that commit 8704e3e used c style includes in c++ sources contrary to the style used in the rest of the c++ code and fixed those.
Simple error setting the expression width of the FALSE clause of a
ternary expression when the expression is short cuirted to false.
Fix a simple error where the type of a system function is not returned
through the test_width function.
The arguments to user defined functions are self-determined. And if
the result is real valued, we can call them lossless self-determined.
Treat these arguments like r-value elaboration for assignments.
Also clean up the binary divide elaboration a little bit.
Also, floating point literals are unsized with width==1.
Widths of real values are always 1. When paired with vectorable types
in expressions, the vectorable type is processed as losslessly self-
determined. ("unsized" in the test_width methods.)
Don't force the expression with to be different from the l-value if the
l-value is the immediate destination. This saves the effort of handling
overly wide constant values in simple cases.
Also, in determined contexts, signed unary minus does not need to pad the
width of the expression.
the PGAssign elaborate method used the test_width to get the width
of the r-value expression. This should be completely sufficient to
get the width of the expression, so always use a defined width to
elaborate the expression.
When ternary expressions are self-determined, use the test_width
method to get a proper reading of the expression width. Also improve
the test_width method to handle unsized operands.
The true and false expression clauses must have compatible types,
which are not necesarily identical. In particular, VT_BOOL and
VT_LOGIC are compatible for the purposes of ternary arguments. The
test in NetETernary::synthesize was incorrect.
In the process, fix the type handling of NetConst objects to allow
for IVL_VT_BOOL constants. This is information that the downstream
may find useful, so should be handled correctly.
Nothing to do with tab width! Eliminates useless
trailing spaces and tabs, and nearly all <space><tab>
pairings. No change to derived files (e.g., .vvp),
non-master files (e.g., lxt2_write.c) or the new tgt-vhdl
directory.
Low priority, simple entropy reduction. Please apply
unless it deletes some steganographic content you want
to keep.
In continuous assignment, the width of the expression needs to come
from the expression itself, and not just from the width of the l-value.
Use the PExpr::test_width method to get the width of the expression
to pass to the elaborate.
When the condition expression of a ternary is constant 1 or 0, we can
short-circuit the elaboration by only processing the clause (true or
false) that we need. This saves compile time and execution time.
It is possible for the left operand of a left shift to be not known
early during elaborate expression. In that case, make a punt expression
and expect it to be resolved later.
The expr:::synthesize methods need not deal with saturating left or
right shifts if they are dealt with early, in elaborate_expr methods.
So the elaborate_expr for shift takes on much more responsibility.
Stephen Williams
Martin Whitaker
Larry Doolittle
Jared Casper
Cary R