From 8856c07d8852219ee38e9262d11790b5f653ebd2 Mon Sep 17 00:00:00 2001
From: steve <steve>
Date: Mon, 26 Mar 2007 20:32:47 +0000
Subject: [PATCH]  More efficient allocate of ivl_nexus_t objects.

---
 t-dll.cc | 32 ++++++++++++++++++++++++++++++--
 t-dll.h  | 11 ++++++++++-
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/t-dll.cc b/t-dll.cc
index b354e032c..c9daa9f19 100644
--- a/t-dll.cc
+++ b/t-dll.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: t-dll.cc,v 1.168 2007/03/26 18:17:51 steve Exp $"
+#ident "$Id: t-dll.cc,v 1.169 2007/03/26 20:32:47 steve Exp $"
 #endif
 
 # include "config.h"
@@ -102,6 +102,31 @@ inline const char*dlerror(void)
 { return strerror( errno ); }
 #endif
 
+/*
+ * The custom new operator for the ivl_nexus_s type allows us to
+ * allocate nexus objects in blocks. There are generally lots of them
+ * permanently allocated, and allocating them in blocks reduces the
+ * allocation overhead.
+ */
+static struct ivl_nexus_s * nexus_pool_ptr = 0;
+static int nexus_pool_remaining = 0;
+static const size_t NEXUS_POOL_SIZE = 4096;
+
+void* ivl_nexus_s::operator new(size_t s)
+{
+      assert(s == sizeof(struct ivl_nexus_s));
+      if (nexus_pool_remaining <= 0) {
+	    nexus_pool_ptr = new struct ivl_nexus_s[NEXUS_POOL_SIZE];
+	    nexus_pool_remaining = NEXUS_POOL_SIZE;
+      }
+
+      struct ivl_nexus_s*tmp = nexus_pool_ptr;
+      nexus_pool_ptr += 1;
+      nexus_pool_remaining -= 1;
+
+      return tmp;
+}
+
 inline static const char *basename(ivl_scope_t scope, const char *inst)
 {
       inst += strlen(ivl_scope_name(scope));
@@ -231,7 +256,7 @@ ivl_signal_t dll_target::find_signal(ivl_design_s &des, const NetNet*net)
       ivl_scope_t scope = find_scope(des, net->scope());
       assert(scope);
 
-      const char*nname = net->name();
+      perm_string nname = net->name();
 
       for (unsigned idx = 0 ;  idx < scope->nsigs_ ;  idx += 1) {
 	    if (strcmp(scope->sigs_[idx]->name_, nname) == 0)
@@ -2200,6 +2225,9 @@ extern const struct target tgt_dll = { "dll", &dll_target_obj };
 
 /*
  * $Log: t-dll.cc,v $
+ * Revision 1.169  2007/03/26 20:32:47  steve
+ *  More efficient allocate of ivl_nexus_t objects.
+ *
  * Revision 1.168  2007/03/26 18:17:51  steve
  *  Remove pretense of general use for t_cookie.
  *
diff --git a/t-dll.h b/t-dll.h
index 086dda9ac..6f5f3ebbe 100644
--- a/t-dll.h
+++ b/t-dll.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: t-dll.h,v 1.140 2007/03/26 16:51:49 steve Exp $"
+#ident "$Id: t-dll.h,v 1.141 2007/03/26 20:32:47 steve Exp $"
 #endif
 
 # include  "target.h"
@@ -477,12 +477,18 @@ struct ivl_nexus_ptr_s {
 # define __NEXUS_PTR_CON 2
 # define __NEXUS_PTR_LPM 3
 
+/*
+ * NOTE: ONLY allocat ivl_nexus_s objects with the included "new" operator.
+ */
 struct ivl_nexus_s {
       unsigned nptr_;
       struct ivl_nexus_ptr_s*ptrs_;
       const Nexus*nexus_;
       const char*name_;
       void*private_data;
+
+      void* operator new (size_t s);
+      void  operator delete(void*obj, size_t s); // Not implemented
 };
 
 /*
@@ -670,6 +676,9 @@ struct ivl_statement_s {
 
 /*
  * $Log: t-dll.h,v $
+ * Revision 1.141  2007/03/26 20:32:47  steve
+ *  More efficient allocate of ivl_nexus_t objects.
+ *
  * Revision 1.140  2007/03/26 16:51:49  steve
  *  do not calculate nexus name unless needed.
  *