From 8136d004c99a7aa221c658c4219d5b3a2e8050c4 Mon Sep 17 00:00:00 2001
From: Michael Goldstein <mgoldstein322@gmail.com>
Date: Wed, 17 Jul 2024 20:56:15 -0400
Subject: [PATCH] add hw prefetchers to prefetch factory swap memory and core
 initialization to stop seg fault in prefetch init

---
 src/macsim.cc       |  6 +++---
 src/memory.cc       | 17 +++++++++++++++++
 src/pref_factory.cc | 26 ++++++++++++++++++++++++--
 3 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/src/macsim.cc b/src/macsim.cc
index 92d5e414..a8171bd1 100644
--- a/src/macsim.cc
+++ b/src/macsim.cc
@@ -730,12 +730,12 @@ void macsim_c::initialize(int argc, char** argv) {
     new manifold::kernel::Clock(1);  // clock has to be global or static
 #endif
 
-  // initialize cores
-  init_cores(m_num_sim_cores);
-
   // init memory
   init_memory();
 
+  // initialize cores
+  init_cores(m_num_sim_cores);
+
   // initialize some of my output streams to the standards */
   init_output_streams();
 
diff --git a/src/memory.cc b/src/memory.cc
index a7e609f3..21fd89c7 100644
--- a/src/memory.cc
+++ b/src/memory.cc
@@ -627,6 +627,23 @@ int dcu_c::access(uop_c* uop) {
     else if (req_type == MRT_DPRF) {
       return m_latency;
     }
+
+    // // TODO: insert hardware prefetch code here? -- need to init somewhere
+    // if (*m_simBase->m_knobs->KNOB_PREF_2DC_ON) {
+    //   //
+    // }
+
+    // if (*m_simBase->m_knobs->KNOB_PREF_STREAM_ON) {
+    //   //
+    // }
+
+    // if (*m_simBase->m_knobs->KNOB_PREF_STRIDE_ON) {
+    //   //
+    // }
+
+    // if (*m_simBase->m_knobs->KNOB_PREF_GHB_ON) {
+    //   //
+    // }
   }  // !cache_hit
 
   return -1;  // cache miss
diff --git a/src/pref_factory.cc b/src/pref_factory.cc
index d8e4bafd..26d114fb 100644
--- a/src/pref_factory.cc
+++ b/src/pref_factory.cc
@@ -37,13 +37,35 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "pref_factory.h"
 #include "assert.h"
 #include "pref_stride.h"
+#include "all_knobs.h"
+#include "hw_prefetcher/pref_2dc.h"
+#include "hw_prefetcher/pref_ghb.h"
+#include "hw_prefetcher/pref_stream.h"
+#include "hw_prefetcher/pref_stridepc.h"
 
 ///////////////////////////////////////////////////////////////////////////////////////////////
 
 void pref_factory(vector<pref_base_c *> &pref_table, hwp_common_c *hcc,
                   Unit_Type type, macsim_c *simBase) {
-  pref_base_c *pref_stride = new pref_stride_c(hcc, type, simBase);
-  pref_table.push_back(pref_stride);
+  pref_base_c *pref = nullptr;
+  if (*simBase->m_knobs->KNOB_PREF_2DC_ON) {
+    pref = new pref_2dc_c(hcc, type, simBase);
+  }
+
+  if (*simBase->m_knobs->KNOB_PREF_GHB_ON) {
+    pref = new pref_ghb_c(hcc, type, simBase);
+  }
+
+  if (*simBase->m_knobs->KNOB_PREF_STREAM_ON) {
+    pref = new pref_stream_c(hcc, type, simBase);
+  }
+
+  if (*simBase->m_knobs->KNOB_PREF_STRIDEPC_ON) {
+    pref = new pref_stridepc_c(hcc, type, simBase);
+  }
+
+  assert(pref != nullptr);
+  pref_table.push_back(pref);
 }
 
 // Singleton pointer to pref_factory_c