systemverilog-plugin: Add description for simplify files in third_party/yosys
Signed-off-by: Magdalena Andrys <mandrys@antmicro.com>
diff --git a/systemverilog-plugin/third_party/yosys/README b/systemverilog-plugin/third_party/yosys/README
index ceb62a9..df69e69 100644
--- a/systemverilog-plugin/third_party/yosys/README
+++ b/systemverilog-plugin/third_party/yosys/README
@@ -11,7 +11,21 @@
- Removed Yosys namespace; `const2ast()` has been placed inside
`systemverilog_plugin` namespace to avoid conflicts with the symbol from
Yosys when statically linking.
+- simplify.cc: yosys/frontends/ast/simplify.cc (rev. ceef00c)
+ - The file is a part of Yosys AST frontend. It has been placed in the plugin,
+ as in some cases we need to adjust it to support certain functionalities
+ in the plugin. Since it is included now in the plugin, we can skip caling
+ the original Yosys' simplify() during AST preparation. The original Yosys'
+ simplify() is only called in uhdmcommonfrontend.cc when Yosys' process()
+ is called, after having AST done.
+ - Changes:
+ - Removed unneeded code and member functions of AstNode::
+ - Modified usage of AstNode:: members that are called from the Yosys'
+ AstNode:: struct.
+ - The file will be extended in the future instead of simplify_sv()
+ in UhdmAst.cc, and it will be moved to other directory then.
Non-copied files placed here for interfacing purposes:
- const2ast.h
+- simplify.h
