From ba263efb92ffba13212cf4ee6fd15b4339349fb3 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Fri, 23 Sep 2022 09:02:59 -0700
Subject: Basic IPC stats support

---
 backend/regfile.h |  4 ++++
 infra/stat.h      | 35 +++++++++++++++++++++++++++++++++++
 pt                |  8 ++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 infra/stat.h

diff --git a/backend/regfile.h b/backend/regfile.h
index 4cf328a..4ea2f31 100644
--- a/backend/regfile.h
+++ b/backend/regfile.h
@@ -4,6 +4,7 @@
 
 #include "frontend/decode.h"
 #include "infra/port.h"
+#include "infra/stat.h"
 #include "inst.h"
 #include "memory/dram.h"
 
@@ -16,6 +17,8 @@ namespace backend {
         infra::port<inst> writebackp;
         infra::port<memory::dram::command> *storep = nullptr;
 
+        infra::stat ipc{"ipc"};
+
         unsigned int generation_up = 0;
         unsigned int generation_down = 0;
 
@@ -33,6 +36,7 @@ namespace backend {
                 auto i = writebackp.read();
                 if (i.generation == generation_down) {
                     pte(i.transaction, "W", fmt::format("writeback gen={} pc={:x}", generation_down, pc));
+                    ++ipc;
                     assert(pc == i.init_pc);
                     auto old_pc = pc;
                     pc = i.linear_next_pc;
diff --git a/infra/stat.h b/infra/stat.h
new file mode 100644
index 0000000..f1ca75a
--- /dev/null
+++ b/infra/stat.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <fmt/format.h>
+#include <utility>
+
+#include "infra/sim.h"
+
+namespace infra {
+    struct stat : public sim {
+        std::string name;
+        std::uint64_t numerator = 0;
+        std::uint64_t denominator = 0;
+
+        stat(std::string name)
+            : name(std::move(name))
+        { }
+
+        ~stat() {
+            fmt::print("# {} {}\n", name, (double)numerator/(double)denominator);
+        }
+
+        void unclock() {
+            ++denominator;
+        }
+
+        stat & operator++() {
+            ++numerator;
+            return *this;
+        }
+
+        stat & operator++(int) {
+            return operator++();
+        }
+    };
+}
diff --git a/pt b/pt
index 489a13a..206795f 100755
--- a/pt
+++ b/pt
@@ -9,6 +9,8 @@ $data = {}
 $horiz = {}
 $maxtime = -1
 
+$stats = false
+
 $stdin.each_line do | line |
   case line
 
@@ -38,11 +40,17 @@ $stdin.each_line do | line |
       end
       $maxtime = [$maxtime, time+1].max
 
+    when /^#\s*(.*)$/
+      $stats = true
+      $stdout.write("#{$1}\n")
+
     else
       raise "Unexpected line: #{line}"
   end
 end
 
+$stdout.write("\n") if $stats
+
 $hier = {}
 $hier_direct = {}
 
-- 
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