cellhelp: Split gate-level and word-level cells

Makefile

@@ -979,7 +979,7 @@ docs/source/cmd/abc.rst: $(TARGETS) $(EXTRA_TARGETS)
 	$(Q) cd temp && ./../$(PROGRAM_PREFIX)yosys -p 'help -write-rst-command-reference-manual'
 	$(Q) rsync -rc temp/docs/source/cmd docs/source
 	$(Q) rm -rf temp
-docs/source/cell/add.rst: $(TARGETS) $(EXTRA_TARGETS)
+docs/source/cell/word_add.rst: $(TARGETS) $(EXTRA_TARGETS)
 	$(Q) mkdir -p docs/source/cell
 	$(Q) mkdir -p temp/docs/source/cell
 	$(Q) cd temp && ./../$(PROGRAM_PREFIX)yosys -p 'help -write-rst-cells-manual'
@@ -1020,7 +1020,7 @@ docs/reqs:
 	$(Q) $(MAKE) -C docs reqs
 
 DOC_TARGET ?= html
-docs: docs/source/cmd/abc.rst docs/gen_examples docs/gen_images docs/guidelines docs/usage docs/reqs
+docs: docs/source/cmd/abc.rst docs/source/cell/word_add.rst docs/gen_examples docs/gen_images docs/guidelines docs/usage docs/reqs
 	$(Q) $(MAKE) -C docs $(DOC_TARGET)
 
 clean:

docs/source/cell_gate.rst

@@ -0,0 +1,9 @@
+Gate-level cells
+----------------
+
+.. toctree::
+   :caption: Gate-level cells
+   :maxdepth: 1
+   :glob:
+
+   /cell/gate_*

docs/source/cell_ref.rst

@@ -5,8 +5,9 @@ Internal cell reference
 ================================================================================
 
 .. toctree::
-	:caption: Internal cell reference
-	:maxdepth: 1
-	:glob:
+   :caption: Internal cell reference
+   :maxdepth: 2
+   :glob:
 
-	/cell/*
+   cell_word
+   cell_gate

docs/source/cell_word.rst

@@ -0,0 +1,9 @@
+Word-level cells
+----------------
+
+.. toctree::
+   :caption: Word-level cells
+   :maxdepth: 1
+   :glob:
+
+   /cell/word_*

kernel/register.cc

@@ -751,7 +751,10 @@ struct SimHelper {
 	string name;
 	inline string filesafe_name() {
 		if (name.at(0) == '$')
-			return name.substr(1);
+			if (name.at(1) == '_')
+				return "gate" + name.substr(1);
+			else
+				return "word_" + name.substr(1);
 		else
 			return name;
 	}