Binary bit based operators were not padding arguments if they had
different widths. The reduction operators and ! were not correctly
evaluating their arguments in a self-determined context.
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).
This patch adds bit based power support to normal expressions.
It also pushes the constant unsigned bit based calculation to
the runtime until the bit based method can be copied to the
compiler. Continuous assignments also need to use this type
of calculation.
This patch adds a check and prints a warning message when the power
operator is used with unsigned bit based values. It also fixes a couple
of typos and adds an asserts if the above power operator happens to
get to the tgt-vvp back end.
The compiler attempts to precalculate the results of <= comparisons.
Fix a few corner cases where the arguments are signed. Also fix the
important test of constant against non-constant where we try to test
if the non-constant value can possibly make the test fail.
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.
Comparison operands are signed only of both operands are signed.
If one is unsigned, then they both are unsigned. This does not
affect the signedness of the comparison itself, which is unsigned.
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>
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>
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>
distinguish between self-determined and value-preserving when
evaluating constants that are arguments to concatenations.
Signed-off-by: Stephen Williams <steve@icarus.com>
This fixes r-value type references to memory words for memories
that have a non-zero base address. Elaborate the expression
needed to get the canonical word index.
Real value are vector width of 1, fix real literal to reflect this.
fix leaking real registers in code generation for function arguments.
Load of signal should handle conversion from real to vector. Function
arguments, type vector passed a real value, are an example where this
comes up.
Signed-off-by: Stephen Williams <steve@icarus.com>
more general concept of arrays. The NetMemory and NetEMemory
classes are removed from the ivl core program, and the IVL_LPM_RAM
lpm type is removed from the ivl_target API.
Stephen Williams
Cary R
Larry Doolittle
Martin Whitaker
steve