Collect Stats for WP is unavailable

PrincetonUniversity · Jan 22, 2025 · 3de839b · 3de839b
1 parent d83aec0
commit 3de839b
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Showing 3 changed files with 25 additions and 4 deletions.
diff --git a/inc/ooo_cpu.h b/inc/ooo_cpu.h
@@ -96,7 +96,10 @@ struct cpu_stats {
   uint64_t wrong_path_loads = 0;
   uint64_t wrong_path_loads_executed = 0;
   uint64_t non_branch_squashes = 0;
-  uint64_t fetch_mispred_block_cycles = 0;
+  uint64_t fetch_mispred_block_cycles = 0; 
+
+  uint64_t lack_of_WP_inst_count = 0;
+  uint64_t lack_of_WP_inst_cycles = 0; 
 
   uint64_t lq_full_events = 0;
   uint64_t sq_full_events = 0;
@@ -132,6 +135,10 @@ class O3_CPU : public champsim::operable
 {
 public:
   uint32_t cpu = 0;
+
+  //for when we dont have wrong path instr available
+  uint64_t WP_insts_not_available_cycle = 0;
+  bool WP_insts_not_available = false;
 
   // cycle
   uint64_t begin_phase_cycle = 0;

diff --git a/src/ooo_cpu.cc b/src/ooo_cpu.cc
@@ -212,14 +212,16 @@ void O3_CPU::initialize_instruction()
     #ifdef BGODALA
     fmt::print("inserting ip: {:#x} wp: {}\n", inst.ip, inst.is_wrong_path);
     #endif
-
+
+    // Following condition will be only true if the wrong path instructions are finished 
     if (in_wrong_path && !inst.is_wrong_path){
         stop_fetch = true;
-	    in_wrong_path = false;
+	      in_wrong_path = false;
         fetch_resume_cycle = std::numeric_limits<uint64_t>::max();
         #ifdef BGODALA
-	    fmt::print("wrong path over at ip: {:#x}\n", inst.ip);
+	        fmt::print("wrong path over at ip: {:#x}\n", inst.ip);
         #endif
+        WP_insts_not_available = true;
 	    break;
     }
 
@@ -441,6 +443,17 @@ long O3_CPU::fetch_instruction()
   bool failed = false;
 
   auto l1i_req_begin = std::find_if(std::begin(IFETCH_BUFFER), std::end(IFETCH_BUFFER), fetch_ready);
+
+  if(WP_insts_not_available && IFETCH_BUFFER.empty() && !WP_insts_not_available_cycle){
+      sim_stats.lack_of_WP_inst_count++;
+      WP_insts_not_available_cycle = current_cycle;
+  } 
+
+  if (WP_insts_not_available_cycle && IFETCH_BUFFER.size()) {
+      sim_stats.lack_of_WP_inst_cycles += current_cycle - WP_insts_not_available_cycle;
+      WP_insts_not_available_cycle = 0;
+  }
+
   for (auto to_read = L1I_BANDWIDTH; to_read > 0 && l1i_req_begin != std::end(IFETCH_BUFFER); --to_read) {
     auto l1i_req_end = std::adjacent_find(l1i_req_begin, std::end(IFETCH_BUFFER), no_match_ip);
     if (l1i_req_end != std::end(IFETCH_BUFFER)) {

diff --git a/src/plain_printer.cc b/src/plain_printer.cc
@@ -85,6 +85,7 @@ void champsim::plain_printer::print(O3_CPU::stats_type stats)
   fmt::print(stream, "LQ Full Events {}\n", stats.lq_full_events);
   fmt::print(stream, "SQ Full Events {}\n", stats.sq_full_events);
   fmt::print(stream, "Non Branch Squashes {}\n", stats.non_branch_squashes);
+  fmt::print(stream, "WP Not Available Count {} Cycles {}\n", stats.lack_of_WP_inst_count, stats.lack_of_WP_inst_cycles);
   fmt::print(stream, "\n");
 
   fmt::print(stream, "Inst Stats\n");