Update experimental pass warnings to use a shared function. Reduces repetition, and also allows all of the warning flags to be combined (which at present is just experimental and the new internal).
Update `test_*` passes to call `internal()` in their constructors.
- Techlib pmgens are now in relevant techlibs/*.
- `peepopt` pmgens are now in passes/opt.
- `test_pmgen` is still in passes/pmgen.
- Update `Makefile.inc` and `.gitignore` file(s) to match new `*_pm.h` location,
as well as the `#include`s.
- Change default `%_pm.h` make target to `techlibs/%_pm.h` and move it to the
top level Makefile.
- Update pmgen target to use `$(notdir $*)` (where `$*` is the part of the file
name that matched the '%' in the target) instead of `$(subst _pm.h,,$(notdir
$@))`.
* area should be 1 for all LUTs
* clean up macros
* add log_assert to fail noisily when encountering oddly configured DFF
* clean help msg
* flatten set to true by default
* update
* merge mult tests
* remove redundant test
* move all dsp tests to single file and remove redundant tests
* update ram tests
* add more dff tests
* fix c++20 compile errors
* add option to dump verilog
* default to use abc9
* remove -abc9 option since its the default now
---------
Co-authored-by: tony <minchunlin@gmail.com>
The input to a shift operation is padded.
This reduced the final number of MUX cells
but during techmap it can create huge
temporary multiplexers in the log shifter.
This significantly increases runtime and resources.
A limit is added with a warning when it is used.
If the offset is larger than the signal itself,
meaning the signal is completely shifted out,
it tried to extract a negative amount of bits from the old signal.
This RTL pattern is suspicious since it is a complicated way of
arriving at a constant value, so we warn the user.
