From 66ab88d7b0636c21d5df74f753ed379a799fd783 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sat, 27 Dec 2014 03:04:50 +0100
Subject: [PATCH] More hashtable finetuning

---
 kernel/hashmap.h         | 31 +++++++++++++++++++++++++------
 kernel/rtlil.cc          |  4 ++--
 kernel/rtlil.h           |  8 +++++---
 kernel/yosys.h           |  3 ++-
 passes/cmds/delete.cc    |  4 ++--
 passes/cmds/splitnets.cc |  2 +-
 passes/opt/opt_clean.cc  |  2 +-
 passes/opt/opt_const.cc  |  2 +-
 passes/opt/opt_share.cc  |  2 +-
 9 files changed, 40 insertions(+), 18 deletions(-)

diff --git a/kernel/hashmap.h b/kernel/hashmap.h
index 91df68a71..729b4916c 100644
--- a/kernel/hashmap.h
+++ b/kernel/hashmap.h
@@ -23,6 +23,8 @@
 #include <string>
 #include <vector>
 
+#define YOSYS_HASHTABLE_SIZE_FACTOR 3
+
 inline unsigned int mkhash(unsigned int a, unsigned int b) {
 	return ((a << 5) + a) ^ b;
 }
@@ -81,8 +83,19 @@ struct hash_ptr_ops {
 	}
 };
 
+struct hash_obj_ops {
+	bool cmp(const void *a, const void *b) const {
+		return a == b;
+	}
+	template<typename T>
+	unsigned int hash(const T *a) const {
+		return a->name.hash();
+	}
+};
+
 inline int hashtable_size(int old_size)
 {
+	// prime numbers, approx. in powers of two
 	if (old_size <         53) return         53;
 	if (old_size <        113) return        113;
 	if (old_size <        251) return        251;
@@ -144,7 +157,9 @@ class dict
 		entries.clear();
 
 		counter = other.size();
-		int new_size = hashtable_size(counter);
+		int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * counter);
+		hashtable.resize(new_size);
+		new_size = new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1;
 		entries.reserve(new_size);
 
 		for (auto &it : other)
@@ -165,7 +180,6 @@ class dict
 	{
 		free_list = -1;
 
-		hashtable.resize(entries.size());
 		for (auto &h : hashtable)
 			h = -1;
 
@@ -221,7 +235,9 @@ class dict
 		if (free_list < 0)
 		{
 			int i = entries.size();
-			entries.resize(hashtable_size(i));
+			int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * entries.size());
+			hashtable.resize(new_size);
+			entries.resize(new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1);
 			entries[i].udata = value;
 			entries[i].set_next_used(0);
 			counter++;
@@ -473,7 +489,9 @@ class pool
 		entries.clear();
 
 		counter = other.size();
-		int new_size = hashtable_size(counter);
+		int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * counter);
+		hashtable.resize(new_size);
+		new_size = new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1;
 		entries.reserve(new_size);
 
 		for (auto &it : other)
@@ -494,7 +512,6 @@ class pool
 	{
 		free_list = -1;
 
-		hashtable.resize(entries.size());
 		for (auto &h : hashtable)
 			h = -1;
 
@@ -550,7 +567,9 @@ class pool
 		if (free_list < 0)
 		{
 			int i = entries.size();
-			entries.resize(hashtable_size(i));
+			int new_size = hashtable_size(YOSYS_HASHTABLE_SIZE_FACTOR * entries.size());
+			hashtable.resize(new_size);
+			entries.resize(new_size / YOSYS_HASHTABLE_SIZE_FACTOR + 1);
 			entries[i].key = key;
 			entries[i].set_next_used(0);
 			counter++;
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 8f65f5273..0114cbd60 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -1132,7 +1132,7 @@ namespace {
 	struct DeleteWireWorker
 	{
 		RTLIL::Module *module;
-		const pool<RTLIL::Wire*, hash_ptr_ops> *wires_p;
+		const pool<RTLIL::Wire*, hash_obj_ops> *wires_p;
 
 		void operator()(RTLIL::SigSpec &sig) {
 			std::vector<RTLIL::SigChunk> chunks = sig;
@@ -1146,7 +1146,7 @@ namespace {
 	};
 }
 
-void RTLIL::Module::remove(const pool<RTLIL::Wire*, hash_ptr_ops> &wires)
+void RTLIL::Module::remove(const pool<RTLIL::Wire*, hash_obj_ops> &wires)
 {
 	log_assert(refcount_wires_ == 0);
 
diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index ae37c350c..c50a58619 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -708,6 +708,8 @@ struct RTLIL::Selection
 
 struct RTLIL::Monitor
 {
+	RTLIL::IdString name;
+	Monitor() { name = stringf("$%d", autoidx++); }
 	virtual ~Monitor() { }
 	virtual void notify_module_add(RTLIL::Module*) { }
 	virtual void notify_module_del(RTLIL::Module*) { }
@@ -719,7 +721,7 @@ struct RTLIL::Monitor
 
 struct RTLIL::Design
 {
-	pool<RTLIL::Monitor*, hash_ptr_ops> monitors;
+	pool<RTLIL::Monitor*, hash_obj_ops> monitors;
 	dict<std::string, std::string> scratchpad;
 
 	int refcount_modules_;
@@ -806,7 +808,7 @@ protected:
 
 public:
 	RTLIL::Design *design;
-	pool<RTLIL::Monitor*, hash_ptr_ops> monitors;
+	pool<RTLIL::Monitor*, hash_obj_ops> monitors;
 
 	int refcount_wires_;
 	int refcount_cells_;
@@ -860,7 +862,7 @@ public:
 	RTLIL::ObjRange<RTLIL::Cell*> cells() { return RTLIL::ObjRange<RTLIL::Cell*>(&cells_, &refcount_cells_); }
 
 	// Removing wires is expensive. If you have to remove wires, remove them all at once.
-	void remove(const pool<RTLIL::Wire*, hash_ptr_ops> &wires);
+	void remove(const pool<RTLIL::Wire*, hash_obj_ops> &wires);
 	void remove(RTLIL::Cell *cell);
 
 	void rename(RTLIL::Wire *wire, RTLIL::IdString new_name);
diff --git a/kernel/yosys.h b/kernel/yosys.h
index 012b40c1f..d47f3a958 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -149,6 +149,8 @@ void remove_directory(std::string dirname);
 template<typename T> int GetSize(const T &obj) { return obj.size(); }
 int GetSize(RTLIL::Wire *wire);
 
+extern int autoidx;
+
 YOSYS_NAMESPACE_END
 
 #include "kernel/log.h"
@@ -164,7 +166,6 @@ void yosys_shutdown();
 Tcl_Interp *yosys_get_tcl_interp();
 #endif
 
-extern int autoidx;
 extern RTLIL::Design *yosys_design;
 
 RTLIL::IdString new_id(std::string file, int line, std::string func);
diff --git a/passes/cmds/delete.cc b/passes/cmds/delete.cc
index 4c8f16f48..5bf2a36b8 100644
--- a/passes/cmds/delete.cc
+++ b/passes/cmds/delete.cc
@@ -91,8 +91,8 @@ struct DeletePass : public Pass {
 				continue;
 			}
 
-			pool<RTLIL::Wire*, hash_ptr_ops> delete_wires;
-			pool<RTLIL::Cell*, hash_ptr_ops> delete_cells;
+			pool<RTLIL::Wire*, hash_obj_ops> delete_wires;
+			pool<RTLIL::Cell*, hash_obj_ops> delete_cells;
 			pool<RTLIL::IdString> delete_procs;
 			pool<RTLIL::IdString> delete_mems;
 
diff --git a/passes/cmds/splitnets.cc b/passes/cmds/splitnets.cc
index 3b3fc208e..2523c1660 100644
--- a/passes/cmds/splitnets.cc
+++ b/passes/cmds/splitnets.cc
@@ -176,7 +176,7 @@ struct SplitnetsPass : public Pass {
 
 			module->rewrite_sigspecs(worker);
 
-			pool<RTLIL::Wire*, hash_ptr_ops> delete_wires;
+			pool<RTLIL::Wire*, hash_obj_ops> delete_wires;
 			for (auto &it : worker.splitmap)
 				delete_wires.insert(it.first);
 			module->remove(delete_wires);
diff --git a/passes/opt/opt_clean.cc b/passes/opt/opt_clean.cc
index cb12b3922..b387e0381 100644
--- a/passes/opt/opt_clean.cc
+++ b/passes/opt/opt_clean.cc
@@ -262,7 +262,7 @@ void rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbos
 	}
 
 
-	pool<RTLIL::Wire*, hash_ptr_ops> del_wires;
+	pool<RTLIL::Wire*, hash_obj_ops> del_wires;
 
 	int del_wires_count = 0;
 	for (auto wire : maybe_del_wires)
diff --git a/passes/opt/opt_const.cc b/passes/opt/opt_const.cc
index 9c1a18782..f78ea6cc3 100644
--- a/passes/opt/opt_const.cc
+++ b/passes/opt/opt_const.cc
@@ -199,7 +199,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
 	dict<RTLIL::SigSpec, RTLIL::SigSpec> invert_map;
 
 	TopoSort<RTLIL::Cell*, RTLIL::IdString::compare_ptr_by_name<RTLIL::Cell>> cells;
-	dict<RTLIL::Cell*, std::set<RTLIL::SigBit>, hash_ptr_ops> cell_to_inbit;
+	dict<RTLIL::Cell*, std::set<RTLIL::SigBit>, hash_obj_ops> cell_to_inbit;
 	dict<RTLIL::SigBit, std::set<RTLIL::Cell*>> outbit_to_cell;
 
 	for (auto cell : module->cells())
diff --git a/passes/opt/opt_share.cc b/passes/opt/opt_share.cc
index 9bc308873..91bfd58ab 100644
--- a/passes/opt/opt_share.cc
+++ b/passes/opt/opt_share.cc
@@ -41,7 +41,7 @@ struct OptShareWorker
 	CellTypes ct;
 	int total_count;
 #ifdef USE_CELL_HASH_CACHE
-	dict<const RTLIL::Cell*, std::string, hash_ptr_ops> cell_hash_cache;
+	dict<const RTLIL::Cell*, std::string, hash_obj_ops> cell_hash_cache;
 #endif
 
 #ifdef USE_CELL_HASH_CACHE
-- 
2.30.2