br_pred

yonseicasl · May 14, 2023 · ed1e995 · ed1e995
1 parent 603994a
commit ed1e995
Show file tree

Hide file tree

Showing 3 changed files with 7 additions and 6 deletions.
diff --git a/br_predictor.cc b/br_predictor.cc
@@ -20,13 +20,13 @@ br_predictor_t::~br_predictor_t() {
 }
 
 // Is a branch predicted to be taken?
-bool br_predictor_t::is_taken(uint64_t m_pc) {
+bool br_predictor_t::is_taken(inst_t *m_inst) {
     // Predict always not taken.
     return false;
 }
 
 // Update a prediction counter.
-void br_predictor_t::update(uint64_t m_pc, bool m_taken) {
+void br_predictor_t::update(inst_t *m_inst) {
 }
 
 

diff --git a/br_predictor.h b/br_predictor.h
@@ -2,15 +2,16 @@
 #define __BR_PRED_H__
 
 #include <cstdint>
+#include "inst.h"
 
 // Branch predictor
 class br_predictor_t {
 public:
     br_predictor_t(unsigned m_bht_bits, unsigned m_pht_bits, unsigned m_hist_len);
     ~br_predictor_t();
 
-    bool is_taken(uint64_t m_pc);                       // Is a branch predicted to be taken?
-    void update(uint64_t m_pc, bool m_taken);           // Update a prediction counter.
+    bool is_taken(inst_t *m_inst);                      // Is a branch predicted to be taken?
+    void update(inst_t *m_inst);                        // Update a prediction counter.
 
 private:
     unsigned *bht;                                      // Branch history table (BHT)

diff --git a/proc.cc b/proc.cc
@@ -90,7 +90,7 @@ void proc_t::writeback() {
         if(inst->branch_target) {
 #ifdef BR_PRED
             num_br_predicts++;
-            br_predictor->update(inst->pc, inst->branch_taken);
+            br_predictor->update(inst);
             if(inst->branch_taken) {
                 br_target_buffer->update(inst->pc, inst->branch_target);
             }
@@ -211,7 +211,7 @@ void proc_t::fetch() {
             if(get_op_type(inst->op) == op_sb_type) {
 #ifdef BR_PRED
                 // Set the PC to a branch target if the branch is predicted to be taken.
-                inst->pred_taken = br_predictor->is_taken(inst->pc);
+                inst->pred_taken = br_predictor->is_taken(inst);
                 pc = inst->pred_target = inst->pred_taken ?
                                          br_target_buffer->get_target(inst->pc) : pc;
 #else