The new types include:
- FFs with async reset and enable (`$adffe`, `$_DFFE_[NP][NP][01][NP]_`)
- FFs with sync reset (`$sdff`, `$_SDFF_[NP][NP][01]_`)
- FFs with sync reset and enable, reset priority (`$sdffs`, `$_SDFFE_[NP][NP][01][NP]_`)
- FFs with sync reset and enable, enable priority (`$sdffce`, `$_SDFFCE_[NP][NP][01][NP]_`)
- FFs with async reset, set, and enable (`$dffsre`, `$_DFFSRE_[NP][NP][NP][NP]_`)
- latches with reset or set (`$adlatch`, `$_DLATCH_[NP][NP][01]_`)
The new FF types are not actually used anywhere yet (this is left
for future commits).
The $div and $mod cells use truncating division semantics (rounding
towards 0), as defined by e.g. Verilog. Another rounding mode, flooring
(rounding towards negative infinity), can be used in e.g. VHDL. The
new $divfloor cell provides this flooring division.
This commit also fixes the handling of $div in opt_expr, which was
previously optimized as if it was $divfloor.
The $div and $mod cells use truncating division semantics (rounding
towards 0), as defined by e.g. Verilog. Another rounding mode, flooring
(rounding towards negative infinity), can be used in e.g. VHDL. The
new $modfloor cell provides this flooring modulo (also known as "remainder"
in several languages, but this name is ambiguous).
This commit also fixes the handling of $mod in opt_expr, which was
previously optimized as if it was $modfloor.
o Not all derived methods were marked 'override', but it is a great
feature of C++11 that we should make use of.
o While at it: touched header files got a -*- c++ -*- for emacs to
provide support for that language.
o use YS_OVERRIDE for all override keywords (though we should probably
use the plain keyword going forward now that C++11 is established)
The PR prints the name of the module when displaying the final area count.
Pros:
- Easier for the user to `grep` for area information about a specific module
Cons:
- Arguably more verbose, less "pretty" than author desires
Verification:
~~~~
30c30
< Chip area for this module: 20616.349000
---
> Chip area for module '$paramod$d1738fc0bb353d517bc2caf8fef2abb20bced034\picorv32': 20616.349000
70c70
< Chip area for this module: 88.697700
---
> Chip area for module '\picorv32_axi_adapter': 88.697700
102c102
< Chip area for this module: 20705.046700
---
> Chip area for top module '\picorv32_axi': 20705.046700
~~~~
Peter Gadfort
Jannis Harder
Kamyar Mohajerani
Lofty
N. Engelhardt
Marcelina Kościelnicka
Claire Xenia Wolf
N. Engelhardt
whitequark
Xiretza
Alberto Gonzalez
Eddie Hung
Clifford Wolf
Henner Zeller
Edmond Cote